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Pereto, Clément. "Ecodynamique des Terres Rares dans les écosystèmes aquatiques : approches pluridisciplinaire et multi-échelle". Electronic Thesis or Diss., Bordeaux, 2024. http://www.theses.fr/2024BORD0159.
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Les écosystèmes aquatiques sont soumis à de nombreux contaminants, y compris les Terres Rares (REEs), qui forment un groupe cohérent d'éléments aux propriétés physico-chimiques similaires. Au cours des deux dernières décennies, la production et la consommation accrues des REEs pour les technologies modernes ont conduit à leur présence croissante dans les milieux aquatiques. Cependant, des lacunes significatives subsistent qui nécessitent des approches pluridisciplinaires combinant Géochimie et Ecotoxicologie afin de : i) évaluer les cycles géochimiques (distribution, réactivité et devenir) des REEs dans les écosystèmes aquatiques ; et ii) identifier les facteurs et processus contrôlant leurs concentrations dans les organismes aquatiques (biodisponibilité, bioaccumulation). La première partie de ce travail s'est concentrée sur la distribution spatiale et le comportement géochimique des REEs à l'interface continent-océan, principalement en milieu estuarien. L’analyse des concentrations en REEs dissoutes le long d’un profil estuarien dans l’estuaire de la Gironde par condition d’étiage a permis de caractériser le comportement géochimique dans le gradient de salinité avec : (i) un abattement des REEs à faible salinité (S<5), plus importante pour les REEs légères (La, Ce, Pr, Nd) ; (ii) une augmentation des concentrations dissoutes aux salinités intermédiaires (5Aquatic ecosystems are exposed to numerous stresses, including Rare Earth Elements (REEs), which consist of a coherent group of elements and share similar physical and chemical properties. Over the past two decades, increased production and consumption of REEs for modern technologies have led to their growing occurrence in aquatic environments. However, significant knowledge gaps remain, and no comprehensive multidisciplinary approaches currently exist that combine geochemistry and ecotoxicology to assess the geochemical cycles (distribution, reactivity, and fate) of REEs in aquatic systems and the factors and processes controlling their concentrations in aquatic organisms (bioavailability, bioaccumulation). The first part of this work focused on the spatial distribution and geochemical behavior of REEs at the continent-ocean interface, and particularly in estuarine mixing zone. In an oceanographic campaign in the Gironde Estuary, we documented and analyzed the spatial variation of dissolved REE concentrations along a longitudinal profile during a dry hydrological condition. The geochemical behavior showed contrasting reactivity along the salinity gradient, with: (i) a removal of REEs at low salinity (S<5), with higher removal for light REEs (La, Ce, Pr, Nd); (ii) an increase of dissolved REEs at intermediate salinities (5
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DEMARCHI, ALESSANDRO. "COASTAL STATE INDICATORS AND COASTAL VULNERABILITY INDEXES TO IMPROVE EARLY WARNING SYSTEMS. The case study of the Catalan Coast". Doctoral thesis, Politecnico di Torino, 2016. http://hdl.handle.net/11583/2644852.
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Half of the world's population lives within 60 km of the sea and this figure is likely to rise up to 75% by the year 2025. The extraordinary development of the built environment and of the population densities in the coastal areas are making coastal communities highly exposed. The sea level rise induced by climate change is worsening this coastal vulnerability scenario and a considerable amount of people are expected to be susceptible to and threatened by coastal flooding in the near future.
Given that the northern part of the Mediterranean coastal areas is location of critical infrastructure and buildings, it represents one of the most highly exposed coastal area in the world. Its shores are indeed characterized by high rate of population densities and economic activities that extremely increase the risk of facing impacts and losses subsequent to hydro-meteorological hazards.
Considering the rising values of both occurrence and magnitude of storm-induced damages, adequate assessment and forecasting tools are needed in order to enhance the resilience of coastal systems and thus the capability to reduce disaster risks and cascading effects. In particular, thanks to more sophisticated and improved numerical tools, coastal observations and data collection, it is now possible to implement in a timely manner operational morphodynamic predictions able to reduce coastal risk linked to incoming storms. In this scenario, the Integrated COastal Alert SysTem (iCoast) project has been aimed at developing a tool able to address coastal risks caused by extreme waves and high sea water levels in European coastal areas.
In the framework of iCoast, a set of Coastal State Indicators (CSIs) has been developed in order to improve the forecasting and the assessment of coastal risks. CSIs are indeed parameters able to provide end-users with an essential information about coastal hazards and related impacts. CSIs have been chosen as parameters that can be retrieved from the meteorological and the hydrodynamic modules. They include both physical variables used as trigger for meteorological and flood warnings from the majority of the operational National/Regional warning systems and further essential parameters, so called ‘storm integrated’ coastal-storm indicators, which describe the physical processes that drive coastal damages, such as erosion, accumulation, flooding, destructions.
With the target of improving, produce and disclose/spread more efficient general warning messages, in the iCoast approach, specific sets of CSIs have been selected subsequently to their aggregation, weighting and comparison with established thresholds. In such a way, it has been possible and easier to deliver, tailored and adapted alert messages in relation to the different end-users characteristics and requirements.
In the present study, the set of CSIs chosen in the framework of the iCoast Project is presented along with their performances tested for the case study of the Spanish NW Mediterranean Coast (i.e. Catalan Coast) while hypothetic risk scenarios are subsequently delineated and analysed.
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Lu, Chunhui. "Mixing in complex coastal hydrogeologic systems". Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/39600.
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The mixing zone developed at freshwater-seawater interface is one of the most important features in complex coastal hydrogeologic systems, which controls subsurface flow and reactive transport dynamics. Freshwater-seawater mixing-zone development is influenced by many physical and chemical processes, such as characteristics of geologic formation, hydrodynamic fluctuations of groundwater and seawater levels, fluid-rock interactions, and others. Wide mixing zones have been found in many coastal aquifers all over the world. However, the mechanisms responsible for wide mixing zones are not well understood. In this thesis, two hypotheses were proposed to explain wide mixing zones in coastal aquifers: (1) kinetic mass transfer coupled with transient conditions, which create the movement of the mixing zone, may widen mixing zones; and (2) aquifer stratification may widen the mixing zone.
The hypotheses were tested by both multiscale numerical simulations and laboratory experiments. Numerical simulations were based on a variable-density groundwater model by varying mass transfer parameters, including immobile porosity, mobile porosity, and mass transfer coefficient, and the hydraulic conductivity contrast between aquifer layers. Laboratory experiments were conducted in a quasi-two-dimensional tank, where real beach sands were installed and foodstuff dyes were used to visualize the development of freshwater-seawater mixing zone. Major conclusions included (1) the mixing zone can be significantly widened when the mass transfer timescale and the period of transient boundary is comparable due to the nonequilibrium mass transfer effects; and (2) a thick mixing zone occurs in low-permeability layer when it overlays upon a fast flow layer. These results not only improve the understanding of the dynamics of mixing-zone development and its associated geochemical processes in coastal aquifers, but also identify hydrogeologic conditions for the model of sharp-interface approximation to be valid.
In addition to better understanding the mechanisms and dynamics of mixing zone, this thesis also investigates cost-effective management of coastal groundwater resources. To protect and conserve limited water recourses in coastal regions, interest in aquifer storage and recovery (ASR) has been growing in recent years. ASR is a promising strategy for water resources management and has been widely used in many contaminated and saline aquifers. However, its performance may be significantly constrained by mass transfer effects due to the mobilization of solutes initially residing in immobile domains. Better understanding of kinetic mass transfer effects on ASR is needed in order to aid the decision-making process. A numerical model is developed to simulate ASR performance by combining the convergent and divergent dispersion models with a first-order mass transfer model. By analyzing the concentration history at the pumping well, we obtain simple and effective relationships for investigating ASR efficiency under various mass transfer parameters, including capacity ratio and mass transfer timescales, and operational parameters. Based on such relationships, one can conveniently determine whether a site with mass transfer limitations is appropriate or not for ASR and how many ASR cycles are required for achieving a positive recovery efficiency (RE).
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Zhao, Yanlai. "Integrated systems analysis for coastal aquaculture". Thesis, University of Ottawa (Canada), 2004. http://hdl.handle.net/10393/26824.
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This paper presents a model for the evaluation of coastal zone sites in conjunction with supporting decision making on the use of potential sites for aquaculture as well as other site activities including commercial fisheries, and as reserves for natural resources. The decision support model captures site specific data in the form of a geographical information system that overlays selected geographical regions with natural resource dynamics, habitat, commercial activities including aquaculture, and influence plumes including toxicology. Descriptive data for selected regions including system overlays and interactions are then evaluated to provide input to a multicriteria analysis that positions decision makers with respect to the relative importance of resources, habitat, commercial activities, and influence plumes. The model compares alternative evaluations of selected regions among diverse users., as well as providing a group decision evaluation procedure to assist in coastal zonal governance decision makers such as the awarding of fish farm site applications. The model is applied to the coastal zone of Grand Manan Island, New Brunswick situated in the Bay of Fundy.
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Hall, James William. "Uncertainty management for coastal defence systems". Thesis, University of Bristol, 1999. http://hdl.handle.net/1983/9b1c8d07-24f0-48b9-bb7f-73d8d7c40ae6.
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Kingston, Kenneth Samuel. "Applications of complex adaptive systems approaches to coastal systems". Thesis, University of Plymouth, 2003. http://hdl.handle.net/10026.1/474.
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This thesis investigates the application of complex adaptive systems approaches (e.g. Artificial Neural Networks and Evolutionary Computation) to the study of coastal hydrodynamic and morphodynamic behaviour. Traditionally, nearshore morphological coastal system studies have developed an understanding of those physical processes occurring on both short temporal, and small spatial scales with a large degree of success. The associated approaches and concepts used to study the coastal system at these scales have primarily been linear in nature. However, when these approaches to studying the coastal system are extended to investigating larger temporal and spatial scales, which are commensurate with the aims of coastal management, results have had less success. The lack of success in developing an understanding of large scale coastal behaviour is to a large extent attributable to the complex behaviour associated with the coastal system. This complexity arises as a result of both the stochastic and chaotic nature of the coastal system. This allows small scale system understanding to be acquired but prevents the larger scale behaviour to be predicted effectively. This thesis presents four hydro-morphodynamic case studies to demonstrate the utility of complex adaptive system approaches for studying coastal systems. The first two demonstrate the application of Artificial Neural Networks, whilst the latter two illustrate the application of Evolutionary Computation. Case Study #1 considers the nature of the discrepancy between the observed location of wave breaking patterns over submerged sandbars and the actual sandbar locations. Artificial Neural Networks were able to quantitatively correct the observed locations to produce reliable estimates of the actual sand bar locations. Case Study #2 considers the development of an approach for the discrimination of shoreline location in video images for the production of intertidal maps of the nearshore region. In this case the system modelled by the Artificial Neural Network is the nature of the discrimination model carried out by the eye in delineating a shoreline feature between regions of sand and water. The Artificial Neural Network approach was shown to robustly recognise a range of shoreline features at a variety of beaches and hydrodynamic settings. Case Study #3 was the only purely hydrodynamic study considered in the thesis. It investigated the use of Evolutionary Computation to provide means of developing a parametric description of directional wave spectra in both reflective and nonreflective conditions. It is shown to provide a unifying approach which produces results which surpassed those achieved by traditional analysis approaches even though this may not strictly have been considered as a fiddly complex system. Case Study #4 is the most ambitious application and addresses the need for data reduction as a precursor when trying to study large scale morphodynamic data sets. It utilises Evolutionary Computation approaches to extract the significant morphodynamic variability evidenced in both directly and remotely sampled nearshore morphologies. Significant data reduction is achieved whilst reWning up to 90% of the original variability in the data sets. These case studies clearly demonstrate the ability of complex adaptive systems to be successfully applied to coastal system studies. This success has been shown to equal and sometimess surpass the results that may be obtained by traditional approaches. The strong performance of Complex Adaptive System approaches is closely linked to the level of complexity or non-linearity of the system being studied. Based on a qualitative evaluation, Evolutionary Computation was shown to demonstrate an advantage over Artificial Neural Networks in terms of the level of new insights which may be obtained. However, utility also needs to consider general ease of applicability and ease of implementation of the study approach. In this sense, Artificial Neural Networks demonstrate more utility for the study of coastal systems. The qualitative assessment approach used to evaluate the case studies in this thesis, may be used as a guide for choosing the appropriateness of either Artificial Neural Networks or Evolutionary Computation for future coastal system studies.
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Delibas, Adem 1980. "A systems approach to managing nutrient pollution in Cape Cod's coastal waters". Thesis, Massachusetts Institute of Technology, 2013. http://hdl.handle.net/1721.1/100359.
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Thesis: S.M. in Engineering and Management, Massachusetts Institute of Technology, Engineering Systems Division, System Design and Management Program, 2013.Cataloged from PDF version of thesis.
Includes bibliographical references (pages 101-104).
Pressing problems are facing the coastal waters of the world due to the growing human activity. Increasing population and economic development around coastal areas have left many embayments throughout the world severely impaired. Excessive nutrient enrichment in water bodies, also known as nutrient pollution, is one of the leading impairments in coastal waters. Algal blooms, dead zones, and fish kills are spreading because of the nutrient pollution. This thesis presents a systems analysis of the nutrient pollution problem in the context of Cape Cod, Massachusetts, where the continuous degradation in coastal waters is considered as one of the greatest threats to the region's environmental and economic future. It proposes a system dynamics model created with a diverse stakeholder team to uncover the underlying system structure that has created the degradation in Cape Cod's coastal waters since 1960s. An important goal of this work was to support the development of a regional water quality management plan on Cape Cod by creating a shared understanding of the nutrient pollution problem across a wide range of stakeholders. Therefore, the proposed model was created with direct contributions of a diverse stakeholder team including representatives from residents, local municipalities, regional authorities, the state government, and the U.S Environmental Protection Agency. In addition to identifying the causal structure of the system through a set of qualitative diagrams, this thesis also proposes a formal simulation model and presents results of an in-depth policy analysis exploring how the degradation in Cape Cod's coastal waters could evolve under different future scenarios. Both the model-building process and the simulation experiments reveal several critical insights, including nonlinearity of the system behavior, delay in the system's response to interventions, and the importance of timely actions.
by Adem Delibaş.
S.M. in Engineering and Management
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García, León Manuel. "Coastal risk forecast system : fostering proactive management at the Catalan coast". Doctoral thesis, Universitat Politècnica de Catalunya, 2018. http://hdl.handle.net/10803/669662.
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The action of sea storms is one of the most complex littoral processes with deep management implications. Along the Catalan shoreline which is about 700 km long, 190 km are subject to erosion and/or flooding. Around one million people live in areas potentially affected. Sea Level Rise could exacerbate this problem in the near future. Reactive interventions have been the norm in coastal engineering and management. This dissertation proposes a pre-storm strategy that foster cost-effective eco-compatible measures, termed Quick Defence Measures (QDM). Pre-storm intervention requires to forecast the future post-storm state. Hence, the main objective of this thesis is to assess present coastal risk through a Coastal Early Warning System (CEWS), termed LIM-COPAS, that forecasts the more relevant episodic coastal hazards at the area.
LIM-COPAS consists of four modules: (i) meteorological model; (ii) wave generation/propagation code; (iii) coupled morpho-hydrodynamic model and (iv) risk module via non-stationary multivariate probabilistic models. The performance of this suite of models has been tested with (i) a set of hindcast events and (ii) synthetic storm conditions. The hindcasted events have been: December 2008 (D-08); October-2015 (O-15); November 2015 (N-15); January 2016 (J-16); February 2016 (F-16); December 2016 (D-16) and January 2017 (J-17).
In D-08, errors in nearshore spectral wave parameters have been about twice than those in the offshore area. The error was around 20% in hydrodynamics and 50% in morphodynamics. The post-storm response has been acceptably reproduced, with a Brier Skill Score near 0.4.
LIM-COPAS has shown good accuracy with high return period events (i.e. Tr,waves > 10 yrs, D-16 and J-17), but lower agreement was found for milder storms (i.e. O-15 and F-16).
The meteorological module provided wind fields that were systematically overestimated. The integrated Mean Bias (MB) was -1.52 ± 0.78 m/s. Tarragona (Coefficient of Efficiency, COE = 0.27 ± 0.13) and Begur (COE = 0.29 ± 0.17) had metrics above the average value (COE = 0.24 ± 0.14); but lower agreement was found at Mahón (COE = 0.13 ± 0.16) and Dragonera.
Wave metrics were more accurate than for the wind fields. The integrated Hs COE was 0.52±0.12 and Tm02 COE was 0.36±0.14. At the central coast, Hs has presented good metrics: low MB (-0.06 ± 0.08 m) and high COE (0.58 ± 0.11). The northern coast metrics were the most stable.
The newly developed risk module has been implemented at 79 beaches. Erosion has been estimated as a bounded cost, whereas flooding as a high upside cost. Dissipative beaches tend to exhibit higher costs than reflective beaches under high sea levels. Tr,waves < 10 yrs events joint with storm-surges can lead to significant damage costs. The estimated losses for the N-15 event (2510·10^3 euros) do not differ excessively from J-17 (3200·10^3 euros).
Two types of QDM have been numerically tested: (i) sand dunes and (ii) geotextile detached breakwaters. The benefits from maintaining the sand volumes outperform the flooding cost reduction. In general terms, the detached breakwater can be a suitable option for beaches in an intermediate morphodynamic state against low to moderate sea levels and high wave return periods. At dissipative beaches, dunes are the best option, but they require a minimum beach width (around 30 m) that ensures their lifetime.
QDM functionality can be enhanced with compatible long-term actions (nourishments, sand bypasses, submerged vegetation, etc.). A healthy beach state is paramount for the QDM effectiveness. A higher sustainable management under present and future climate can be reached with the joint combination of (i) CEWS as a short-term forecasting tool; (ii) QDM that mitigate storm impacts and (iii) long-term interventions that improves the beach health.La acción de los temporales de mar es uno de los procesos litorales más complejos, con profundas implicaciones en la gestión del litoral. A lo largo de la línea de costa catalana, 190 km están sometidos a erosión y/o inundación. Cerca de un millón de personas viven en áreas potencialmente afectadas. La tradición en ingeniería y gestión costera han sido intervenciones reactivas. Esta tesis propone una estrategia pre-tormenta que fomente una serie de medidas eco-compatibles, denominadas Medidas de Acción Rápida (MAR). Las intervenciones pre-tormenta requieren predecir el estado post-temporal de la costa. Por tanto, el principal objetivo de esta tesis es evaluar el riesgo costero episódico mediante un Sistema de Alarma Temprana Costero (CEWS), denominado LIM-COPAS, que predice las peligrosidades costeras más relevantes en dicha área. LIM-COPAS consiste de cuatro módulos: (i) modelo meteorológico; (ii) código de generación/propagación del oleaje; (iii) modelo acoplado morfo-hidrodinámico y (iv) un módulo de riesgo vía modelos probabilísticos multivariantes y no-estacionarios. El comportamiento de estos módulos ha sido analizado mediante (i) una serie de eventos pasados y (ii) temporales sintéticos. Los eventos pasados han sido: Diciembre 2008 (D-08); Octubre 2015 (O-15); Noviembre 2015 (N-15); Enero 2016 (J-16); Febrero 2016 (F-16); Diciembre 2016 (D-16) y Enero 2017 (J-17). En D-08, los errores en los parámetros espectrales de oleaje costero han sido casi el doble que en mar abierto. El error ha sido del 20% en la hidrodinámica y del 50% en la morfodinámica. La respuesta post-temporal ha sido reproducida aceptablemente, con Brier Skill Score cercanos a 0.4. LIM-COPAS ha demostrado buena precisión con tormentas de alto período de retorno (i.e. Tr,waves _ 10 yrs, D-16 y J-17), pero menor concordancia fue encontrada para las tormentas moderadas (i.e. O-15 y F-16). El módulo meteorológico estimó campos de viento que fueron sistemáticamente sobreestimados. El Sesgo Medio (MB) integrado fue de −1,52 ± 0,78 m/s. Tarragona (Coeficiente de Eficiencia, COE = 0,27±0,13) y Begur (COE = 0,29±0,17) tuvieron métricas por encima de la media (COE = 0,24±0,14); no obstante, peor ajuste se encontró en Mahón (COE = 0,13 ± 0,16) y Dragonera. Las métricas de oleaje fueron más precisas que las del viento. Hs COE integrada fue 0,52±0,12 y Tm02 COE fue 0,36±0,14. En la costa central, Hs presentó buenas métricas: bajo MB (−0,06 ± 0,08 m) y alto COE (0,58 ± 0,11). Las métricas en la costa norte fueron las más estables. El módulo de riesgo ha sido implementado en 79 playas. La erosión se ha estimado como un coste acotado, mientras que la inundación como un coste con alta cota superior. Las playas disipativas tienden a exhibir mayores costes que las playas reflejantes bajo altos niveles del mar. Episodios con Tr,waves _ 10yrs, concomitantes a mareas meteorológicas pueden conllevar costes significantes. Las pérdidas estimadas para N-15 (2510 · 103euros) no difieren en exceso de J-17 (3200 · 103 euros). Dos tipos de MAR han sido testeadas numéricamente: (i) dunas y (ii) diques exentos constituídos por geotextiles llenos de arena. Los beneficios de mantener estables los volúmenes de arena superan la reducción de los costes por inundación. En términos generales, los diques exentos pueden ser una opción adecuada para playas de estado morfodinámico intermedio frente a oleaje de alto período de retorno y niveles del mar bajos a moderados. En playas disipativas, las dunas son la mejor opción, pero requieren un ancho mínimo de playa (cerca de 30 m) que garantice su vida útil. La funcionalidad de las MAR puede mejorarse mediante acciones compatibles a largo-plazo (alimentaciones, bypass de arena, vegetación sumergida, etc.). Un estado de playa saludable es esencial para la efectividad de las MAR. Una gestión más sostenible bajo clima presente y futuro puede ser alcanzada mediante (i) CEWS como herramienta de predicción a corto plazo; (ii) MAR que mitiguen los impactos de los temporales y (iii) intervenciones a largo-plazo que mejoren la salud de la costa.
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Norman, Barbara y barbara norman@canberra edu au. "Integrated coastal management to sustainable coastal planning". RMIT University. Global Studies, Social Science and Planning, 2010. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20100304.120627.
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Integrated coastal management (ICM) has been the basis for coastal planning and management since the 1970s. The theory and practice of ICM is based on the premise that increased integration of planning and management in the coastal zone will lead to improved environmental and social outcomes for the coast. In the context of global and national trends, this thesis examines the application of ICM in three place-based coastal case studies in Victoria: the Gippsland Lakes, Point Nepean and the Geelong region. The particular focus is on the twin challenges of coastal urbanisation and the impacts of climate change. Through a wide range of applied research techniques including focus groups, the research explores the pressures, issues, impacts and implications for ICM and beyond. The case studies point to a number of important implications for ICM and identify opportunities for a more sustainable approach to coastal planning. In reviewing the research findings, a set of five steps and six principles are proposed to respond to policy failures and provide for a transition to more sustainable coastal planning in Victoria. The five steps involve expanding the theory of ICM to be outcome based and regional in its approach to coastal planning and management. In the context of climate change, a more adaptive and systems approach has been incorporated along with recognising the even greater importance of community engagement in coastal planning processes during a period of increased uncertainty and change. The principal instrument for change is a tripartite intergovernmental agreement on sustainable coastal planning underpinned by a set of six principles. These include: agreed and shared outcomes for the coastal environment to facilitate horizontal and vertical integration; an adaptive and systems approach integrating science and urban planning drawing on experience and knowledge in both disciplines; incorporation of the shared outcomes and an adaptive approach into urban and regio nal planning systems for local implementation; regional governance arrangements for integration of policy outcomes and community involvement; capacity building for sustainable coastal planning including interdisciplinary research and community education and long term monitoring and evaluation. The transition from ICM to sustainable coastal planning does not discard ICM but rather incorporates its strengths and adapts the concept to meet the twin challenges of coastal urbanisation and climate change. Further research questions are posed to indicate how the research findings could be further developed as part of a future coastal research agenda. The research findings seek to make a contribution to the theory and practice of ICM to build a pathway to coastal planning for the benefit of our coast and future generations.
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Hassan, Meor Hakif Amir. "Sedimentary facies and sequences stratigraphy : Miocene coastal and coastal plain depostional systems, balingian province, sarawak". Thesis, Imperial College London, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.529350.
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Olquín, Irma. "Speciation in marine systems : the case study of the sea urchin Arbacia incisa (Agassiz 1863) /". For electronic version search Digital dissertations database. Restricted to UC campuses. Access is free to UC campus dissertations, 2003. http://uclibs.org/PID/11984.
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Thesis (Ph. D.)--San Diego State University, and University of California, Davis, 2003.Includes bibliographical references (leaves 65-72). Also available via the World Wide Web. (Restricted to UC campuses)
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Gallagher, Anthony W. "Sustainabilty systems appraisal for integrated coastal zone management". Thesis, Southampton Solent University, 2006. http://ssudl.solent.ac.uk/581/.
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Integrated Coastal Zone Management (ICZM) is a process defined in terms of achieving sustainable development. Despite sustainability being accepted by the majority of organizations currently operating on the coast, the integrated approach is seen as the more constructive and benificial alternative to achieve this state. Id 'success' for ICZM means sustainable development, then the question is raised as to how it attempts to achieve this, and, more speficically, how effectively it does so? Put another way, how can the management process be evaluated in terms of achieving its aims? Despite sevaral attempts to produce sustainability indicator sets, there is currently no established or validated way of assessing the effectiveness of ICZM initiatives and consequently there is also no national overview with thish to judge the strategic performance of coastal partnerships (CPs). This study aims to address this failing by developing and critically evaluating a standardised operating mechanism for assessing the ability of ICZM initiatives to achieve sustainable development. In order to develop this 'Coastal Sustainability Standard', a review was made of the current role and treatment of sustainability in coastal planning and management in the UK. Using the electronic database of the company 'Coastal Management for Sustainability' (CMS), a survey of UK coastal practitioners was carried out as to the key theoretical constructs inherent in the concept of sustainability. Textual analysis of the results, using the qualitative software package, Nud*ist 6, revealed six dominant constructs which would form the basis for the development of the standard. These six - planning; participation; communication; integration; responsibility and balance were defined as principles, and a set of criteria developed for each, with which to enable assessment. A scoring system and a set of guidelines were then designed to maximise the level of objectivity in carrying out the assessment, with the scoring system also reflecting the systems thinking inherent in the design. In order to validate the mechanism, three case study CPs were selected against which to carry out a detailed application of the Standard. These were the Exe Estuary Management Partnership (EEMP); Tamar Estuaries Consultative Forum (TECF) and Pembrokeshire Coastal Forum (PCF), all of which scored relatively poorly. That none of the three CPs achieved the pre-requisite standard raised a number of considerations relating to the efficacy of the Standard and its operation, as well as to the nature of ICZM in the UK and its aim of achieving sustainable development. Conclusions drawn from this evaluation identified that the current operation of ICZM in the UK exhibits a disjointed approach to achieving its long-term goals, as a result of its voluntary nature. The voluntary approach employed in the UK can be seen to be at the root of a number of problems facing the successful development of ICZM. In terms of resources, it has implications for the skills, knowledge and training of coastal managers, as well as the funding available to develop and implement effective plans. The voluntary approach also does not necessarily 'encourage' appropriate cultural changes within or between stakeholder organizations, and does not impart joint responsibility or collective liability upon stakeholders to achieve sustainable development.
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Pozet, Christophe. "Synergy in the evaluation of natural coastal systems". Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/37515.
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Tomlinson, Benjamin John. "Modelling Social-Ecological Systems in the Catalan Coastal Zones". Doctoral thesis, Universitat de Barcelona, 2016. http://hdl.handle.net/10803/384929.
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The Systems Approach Framework (SAF) is a methodological framework designed to enhance the efficacy of human decision-making processes within social-ecological systems with regard to sustainability. The SAF was applied in two case studies in the coastal zone of Catalonia, in two separate European Commission Framework Programme projects entitled “Science and Policy Integration for Coastal System Assessment” (SPICOSA) and “Vectors of Change in Oceans and Seas-marine Life, Impact on Economic Sectors" (VECTORS).
During the SPICOSA application, a common issue of interest to most stakeholders was the water quality (harmful bacteria and water clarity) of the local city beaches, particularly following combined sewer overflow events, and mitigating this impact by using stormwater collectors. Water quality influences the beach users’ decision whether to stay at the beach or to leave, thus affecting the revenue received by the bars and restaurants on the beach front. A social-ecological model was constructed using the methodology outlined in the SAF to represent this issue, so that it could be used as a tool for deliberation between the stakeholders. The model output implies that the stormwater collectors have been useful in improving beach water quality in Barcelona, but there will be diminished returns in constructing more. The value of the beach is clearly large in terms of both non-market value and revenues generated in the nearby bars and restaurants. However, the impact changes in water quality would have on the recreational appeal of the beach is estimated to be low and further research is recommended to determine beach users’ sensitivity to beach closures (bacteria limit exceeded) and turbidity.
At the beginning of the VECTORS project, stakeholders who had participated during the previous SAF application expressed a lack of willingness to engage due to a lack of human resources. The scientific team therefore chose to continue the application with the aspiration of demonstrating the SAF model and results at a later date if the stakeholders found the required resources to engage with the process. There is a general perception that jellyfish abundances are increasing along the Catalan coast. Local authorities are concerned about the stranding events and arrivals of jellyfish to beaches and believe it could reduce the recreational appeal of the beaches. Previous studies also demonstrate the predation of jellyfish (Pelagia noctiluca ephyrae) upon some small pelagic fish larvae (Engraulis encrasicolus). Small pelagics are the principal source of revenue for the local fisheries. A social-ecological model was created in order to capture the effects of changes in abundance of Pelagia noctiluca upon the local fisheries, the tourist industry and the wider economy.
Various future scenarios for different abundances of jellyfish blooms were run. Given the changes that these scenarios would cause on the regional gross domestic product and employment, this study concludes that the overall impact of either of these scenarios on the economy would not be significant at the regional scale.
The inclusion of stakeholders in the SAF methodology is rightly fundamental, but in practice, it can be extremely difficult to persuade key stakeholders to participate, and this is a flaw in the SAF which needs addressing. SAF Application model builders are dependent on stakeholders sharing important data or knowledge but this may be withheld for a variety of reasons including, but not limited to, lack of resources to participate, disinterest, and concern about how the results will be used. The SAF is a well-structured methodology for cases where a mathematical model is both relevant and feasible and should be considered as a useful step-by-step guide for managing coastal zone systems towards sustainability.
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Teixeira, Isabel Cristina Gomes. "Microzooplankton feeding impact in three different european coastal systems". Doctoral thesis, Instituto de Ciências Biomédicas Abel Salazar, 2008. http://hdl.handle.net/10216/19366.
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Knights, Deon Hanley. "The Fate of Nutrients in Two Coastal Freshwater Systems". The Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu159494472722077.
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Almeida, Ângela Augusta Soares de. "Presence of Carbamazepine in coastal systems : effects on bivalves". Master's thesis, Universidade de Aveiro, 2014. http://hdl.handle.net/10773/13378.
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Mestrado em Toxicologia e EcotoxicologiaCarbamazepine (CBZ), an antiepileptic drug, is one of the most commonly detected pharmaceutical drugs in aquatic ecosystems, being used as a marker of anthropogenic pollution. Since CBZ is designed to exert a biological effect, when it reaches aquatic environment high probability exists for toxic effects on non-target organisms. In this way, the present study evaluated the acute (96 h) and chronic toxicity (28 d) of environmentally relevant concentrations of CBZ (0.00, 0.03, 0.30, 3.00, 9.00 μg/L) in the edible clams Venerupis decussata (a native species) and Venerupis philippinarum (an invasive species) collected from the Ria de Aveiro lagoon. The effects on both species were assessed through the use of a battery of biomarkers mainly related with health status and oxidative stress in the organisms. Furthermore, it was applied a promising alternative technique, the immunoassay ELISA for the direct CBZ quantification in clams’ tissues. The results obtained for the acute test showed that CBZ levels in clams’ tissues increased along the exposure concentration range, where V. decussata accumulated more CBZ (except for CBZ 9.00 μg/L) than V. philippinarum. After an exposure of 28 d V. decussata accumulated a higher concentration of CBZ with exception of the highest concentration of exposure, where the levels of CBZ accumulated were similar to the acute test. Although the clams accumulated lower levels of CBZ than the concentration of exposure, these concentrations were enough to impair the health status of the species under study and induce oxidative stress. A different response to CBZ was observed for both species exposed to the acute test. V. philippinarum increased the lipid peroxidation levels at the highest CBZ concentration, whereas V. decussata presented a significant decrease in this parameter. Glutathione S-transferase activity was stimulated for V. decussata and decreased for V. philippinarum. Nevertheless, after exposure to CBZ, for both species it was found an induction of glutathione reductase and superoxide dismutase. The results indicated that, probably, V. philippinarum have a deficient antioxidant defense system compared with V. decussata, being less capable to neutralize reactive oxygen species and thus appeared to be the most sensitive species to the CBZ effects. A 28 d exposure to CBZ resulted in a higher toxicity in V. decussata compared with the same species exposed to the acute test. This was mainly reflected by a lower activity/content in the mechanisms involved in the antioxidant defense system and thus, a lower capability to lead with oxidative stress induced by CBZ. The risk quotient determined for the Ria de Aveiro was higher than 1 indicating that an ecotoxicolgical risk is suspected. Furthermore, the bioaccumulation of CBZ in clams should be taken into consideration since it might be transferred along the food chain, ultimately affecting humans.
A carbamazepina (CBZ), uma droga antiepilética, é uma das drogas farmacêuticas frequentemente detetadas em ecossistemas aquáticos, sendo utilizada como um marcador da poluição antropogénica. Uma vez que a CBZ foi desenhada para exercer um efeito biológico, quando alcança o ambiente aquático existe uma elevada probabilidade para provocar efeitos tóxicos em organismos não-alvo. Desta forma, no presente estudo foi avaliada a toxicidade aguda (96 h) e crónica (28 d) de concentrações ambientalmente relevantes de CBZ (0.00, 0.03, 0.30, 3.00, 9.00 μg/L) em amêijoas comestíveis Venerupis decussata (nativa) e Venerupis philippinarum (invasora) capturadas na Ria de Aveiro. Os efeitos em ambas as espécies foram estudados utilizando uma bateria de biomarcadores principalmente relacionados com o estado de saúde e stress oxidativo nos organismos. Foi aplicada também uma técnica alternativa promissora, o imunoensaio ELISA para a quantificação direta de CBZ nos tecidos das amêijoas. Os resultados obtidos para o teste agudo mostraram um aumento da concentração de CBZ nos tecidos das amêijoas ao longo do intervalo de exposição, tendo V. decussata acumulado mais CBZ (exceto para CBZ 9.00 μg/L) do que V. philippinarum. Após uma exposição de 28 d a V. decussata acumulou uma concentração superior de CBZ, exceto na concentração mais elevada, onde os níveis concentrados foram similares aos do teste agudo. Apesar das amêijoas acumularem baixos níveis de CBZ comparando com a concentração de exposição, estes foram suficientes para comprometer o estado de saúde das espécies em estudo levando a uma condição de stress oxidativo. As duas espécies apresentaram uma resposta diferente à CBZ quando submetidas ao teste agudo. V. philippinarum aumentou os níveis de peroxidação lipídica na concentração mais alta de exposição, ao passo que V. decussata apresentou uma diminuição significativa deste parâmetro. A atividade da glutationa S-transferase foi estimulada no caso da V. decussata e diminuída para V. philippinarum. Não obstante, após a exposição a CBZ, em ambas as espécies ocorreu uma indução das atividades da glutationa reductase e superóxido dismutase. Os resultados indicaram que, provavelmente, V. philippinarum possui um sistema de defesa antioxidante deficiente quando comparada com V. decussata, sendo menos apta na neutralização das espécies reativas de oxigénio e portanto apresentou-se como a espécie mais sensível aos efeitos da CBZ. Uma exposição de 28 d à CBZ resultou numa toxicidade superior na espécie V. decussata por comparação com o teste agudo. Tal foi principalmente refletido na reduzida atividade/conteúdo nos mecanismos envolvidos no sistema de defesa antioxidante, traduzindo-se numa baixa capacidade para combater o stress oxidativo provocado pela CBZ. O quociente de risco determinado para a Ria de Aveiro foi superior a 1 indicando que se suspeita de um risco ecotoxicológico. A bioacumulação de CBZ pelas amêijoas torna evidente a possibilidade de ser transferida ao longo da cadeia alimentar, afetando em último caso o ser humano.
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Teixeira, Isabel Cristina Gomes. "Microzooplankton feeding impact in three different european coastal systems". Tese, Instituto de Ciências Biomédicas Abel Salazar, 2008. http://hdl.handle.net/10216/19366.
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Bostick, Thomas P. "Engaging Stakeholders in Resilience Assessment and Management for Coastal Communities". Thesis, The George Washington University, 2016. http://pqdtopen.proquest.com/#viewpdf?dispub=10150627.
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Coastal hazards including storm surge, sea-level rise, and cyclone winds continue to have devastating effects on infrastructure systems and communities despite the costly investments already being made in risk management to mitigate predicted consequences. Risk management has generally not been sufficiently focused on coastal resilience with community stakeholders involved in the process of making their coastlines more resilient to damaging storms. Thus, without earlier stakeholder involvement in coastal resilient planning for their community, they are frustrated after disasters occur. The US National Academies has defined resilience as “the ability to prepare and plan for, absorb, recover from and more successfully adapt to adverse events” (National Research Council (NRC), 2012). This dissertation introduces a methodology for enabling stakeholder-involved resilience evaluation across the physical, information, cognitive and social domains (DiMase, Collier, Heffner, & Linkov, 2015; Linkov et al., 2013). The methodology addresses the stages of resilience: prepare, absorb, recover and adapt and integrates performance assessment of risk management project initiatives with scenario analysis to characterize disruptions of risk-management priorities (Linkov, Fox-Lent, Keisler, Della Sala, & Sieweke, 2014b). The goal of the methodology is not to find the “right” solution set of priorities by quantitative means., but to develop a methodology for dialogue among the stakeholders. Rather, the purpose is to develop a methodology that would allow stakeholder involvement in the process of making their coastal communities more resilient by determining important resilience stages and domains, critical functions of the system, project initiatives for consideration, and potential future scenarios of concern. Stakeholder qualitative comments are transformed into quantitative inputs to produce qualitative outputs. The results of the methodology allow the stakeholders to easily “see” the priorities and the resilience stages and domains. The methodology is illustrated through a case study at Mobile Bay, Alabama, USA and then illustrated again through a second case study of Southeast Region of Florida and produces more focused results for the stakeholders. The research findings as broadly implemented will benefit federal and local policymakers and emergency responders, business and community leaders, and individual homeowners and residents in the United States and the International Community.
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Ding, Guoping. "Impact of deep building foundations on coastal groundwater flow systems". Click to view the E-thesis via HKUTO, 2006. http://sunzi.lib.hku.hk/hkuto/record/B3769232X.
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Ding, Guoping y 丁國平. "Impact of deep building foundations on coastal groundwater flow systems". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2006. http://hub.hku.hk/bib/B3769232X.
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Orif, Mohammed. "The impacts of atmospherically derived metals on coastal marine systems". Thesis, University of Plymouth, 2007. http://hdl.handle.net/10026.1/1839.
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The total concentrations of trace metals (Al, Fe, Mn, Co, Na, Cu, Zn, Mo, Ni, V, Cd, Pb) have been determined in the marine aerosol at two contrasting coastal sites, Plymouth UK, (December 2001 to April 2003) and Jeddah, Saudi Arabia (August 2002-January 2004). Trace metal concentrations in the Plymouth urban aerosol were lower (2-13 times) than those observed at other comparative UK. urban locations and generally comparable with those observed at European coastal non-urban locations. Statistically significant differences were found in aerosol metal concentrations associated with populations of contrasting air mass sources (i.e. Atlantic and UK/European), being greatest in the UK/European air mass sector for Al, Fe, Mn, Cd, Mo and Pb, owing to enhanced source emission rates from continental Europe. Based on the current work, refined budgets for Ni and Pb for the English Channel were presented. The budgets clearly indicated the importance of the English Channel sediments as both a sink (Ni) and a source (Pb). Aerosol concentrations in the Red Sea Marine Aerosol (RSMA) for the crustally sourced elements Al, Mn and Fe were higher (typically 2.7-3.1 times) than those detected at other comparative sites (i.e. Eastern Mediterranean). The aerosol population associated with the Middle and Southern Saudi Arabia (SSA) air mass had the greatest concentrations of Al, Fe, Mn and Co, whereas, the lowest were found associated with the open Red Sea (RS) marine aerosol. Summer enhancement of aerosol metals was attributed to seasonal dust resuspension as documented in the literature. Red Sea trace metal budgets were presented and would suggest that the sediments are an important source for all elements to the Red Sea water column except for Co and Cd. This work has, therefore, provided unique insights into influences on the air/sea exchange of trace metals and their subsequent impacts and fates in two contrasting marine systems.
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Idrus, Rijal. "Hard Habits to Break: Investigating Coastal Resource Utilisations and Management Systems in Sulawesi, Indonesia". Thesis, University of Canterbury. Geography, 2009. http://hdl.handle.net/10092/3054.
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This research investigates the paradox that many coastal communities in developing countries are resource rich but income poor. Another aspect of this paradox is the belief that local communities possess traditional knowledge that respects nature. This belief contrasts the fact that major tropical coastal ecosystems, namely coral reefs and mangroves, are being destroyed at rapid and increasing rates, in many cases by the people whose livelihoods depend on them. These paradoxical circumstances lead to a central question: if the sustainability of coastal resources is vital for the livelihood of local communities, why are these resources being degraded, often to the point of complete destruction? This study explores the motives and consequences of destructive methods of coastal resource utilisation and examines the potential for sustainable livelihoods based on coastal resources currently under threat from destructive use patterns. The analysis is based on a field study conducted in 2006 and 2008 in eleven sites around the island of Sulawesi, Indonesia. This area is characterised by great biodiversity, including one of the highest marine biodiversities in the Asia-Pacific region. Coral and mangrove ecosystem resource use was found to be driven by different processes and activities; hence the destructive practices impacting both ecosystems were also different. Blast and poison fishing were the most widespread destructive resource use methods found for coral reefs whereas large-scale habitat conversion was responsible for mangrove ecosystem reduction. In the field both resources were found to be under enormous anthropogenic pressures, with published data suggesting that only 5.8% of Indonesian coral reefs are currently in excellent condition and only 38% of mangrove cover remaining in Sulawesi relative to that of 25 years ago. The dynamics of these coastal resources, and of their destruction, are classic examples of the ’tragedy of the commons’. Research findings further indicate that formal institutions tasked with managing these resources have not been able to promote their effective conservation. An array of competing demands and conflicting interests, coupled with inefficient institutional arrangements and under-investment, have rendered inadequate many resource management efforts, including the externally-imposed concepts, allowing destructive patterns of resource utilization to persist. Local communities are disempowered when confronted with (1) the intricate network of destructive-fishing actors targeting coral reefs, or (2) large company-government bureaucracy collusions allowing mangrove conversion. The existence of this collusive network must be considered in any effort to address problems of effective management. Empirical insights suggest that conservation at local level has to face the challenges of market-driven resource extraction at a global scale. Only when a coastal community manages to overcome the dilemma in managing common-pool resource, conservation measures can be implemented and a degree of sustainability attained. Findings from this research have important implications for the discourses on coastal resource policy and research. This research advances the discussions to the area where the core of conflict of interests among stakeholders took place, and yet has rarely been addressed previously. The synthesis from this study provides a strong basis to understand the nature of asymmetric relations amongst the resource stakeholders, and therefore will help in generating effective policies for a fairer coastal resource management regime.
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Robertson-Rintoul, M. J. "The morphology and dynamics of parabolic dunes within the context of the coastal dune systems of mainland Scotland". Thesis, University of Oxford, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.371712.
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Cremonini, Edoardo. "Performance and monitoring of innovative coastal defense works". Master's thesis, Alma Mater Studiorum - Università di Bologna, 2017.
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Beach protection is today emerging as one of the most relevant environmental issues at the global level. The increasing vulnerability of beaches to human impact and the effect of climate change are determining an increasing risk which implies a significant socioeconomic threat. In fact, erosion of beaches and coastlines is observed with increasing frequency, with implications on the societal resilience to natural hazards. Several different techniques can be applied for protecting beaches and the seashore, ranging from structural methods to green and innovative solutions that are the subject of increasing attention in recent times.
The aim of this thesis is to study innovative defense works against the erosion of the coast: in particular, the study focused on a submerged concrete barrier prototype, called WMESH, whose first modules have been recently installed in an area of the sea bad of the Emilia-Romagna coast. It is a permeable submerged barrier made up of reinforced concrete with a geometry that can dissipate a substantial portion of the wave energy, to promote the sand flow down to the shore and counteract its return. The first monitoring of the positioned modules and statistical tests on the wave and tide conditions in the affected area were performed in order to see the structure's response. These tests allowed to perform computer simulations with the 2D MIKE 21 program: the obtained results show that the structure responds positively, creating a reduction in the significant wave height and generating a sediment accumulation area in the area surrounding it.
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Rahman, Md Rashedur. "Shrimp Based Rice Cropping Systems in the Coastal Area of Bangladesh". 京都大学 (Kyoto University), 2014. http://hdl.handle.net/2433/188853.
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Sanò, Marcello. "A Systems Approach to Identify Indicators for Integrated Coastal Zone Management". Doctoral thesis, Universidad de Cantabria, 2009. http://hdl.handle.net/10803/10620.
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El objetivo de la tesis es establecer un marco metodológico para la identificación de indicadores GIZC orientados a problemas y temas de interés, para contextos geográficos específicos. La tesis parte de la idea de que los sistemas de indicadores, utilizados para medir el estado de la costa y la implementación de proyectos de Gestión Integrada de las Zonas Costeras (GIZC), deben orientarse a problemas concretos de la zona de estudio y que su validez debe ser comprobada no sólo por la opinión de los expertos, sino también por la percepción de los usuarios y por el análisis estadístico cuantitativo.The problem addressed by this thesis is the identification of site-specific and problem-oriented sets of indicators, to be used to determine baseline conditions and to monitor the effect of ICZM initiatives.The approach followed integrates contributions from coastal experts and stakeholders, systems theory, and the use of multivariate analysis techniques in order to provide a cost-effective set of indicators, oriented to site-specific problems, with a broad system perspective.A systems approach, based on systems thinking theory and practice, is developed and tested in this thesis to design models of coastal systems, through the identification of the system's components and relations, using the contribution of experts and stakeholders.Quantitative analysis of the system is then carried out, assessing the contribution of stakeholders and using multivariate statistics (principal components analysis), in order to understand the structure of the system, including relationships between variables.The simplification of the system (reduction of the number of variables) is one of the main outcomes, both in the participatory system's design and in the quantitative multivariate analysis, aiming at a cost-effective set of key variables to be used as indicators for coastal management.
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李海龍 y Hailong Li. "Tide-induced periodic groundwater and air flows in coastal aquifer systems". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2003. http://hub.hku.hk/bib/B31244452.
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Saunders, James Edward. "Measuring and understanding biogenic influences upon cohesive sediment stability in intertidal systems". Thesis, St Andrews, 2008. http://hdl.handle.net/10023/868.
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Lickley, Megan Jeramaz. "The vulnerability of U.S. coastal energy infrastructure under climate change". Thesis, Massachusetts Institute of Technology, 2012. http://hdl.handle.net/1721.1/78496.
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Thesis (S.M. in Technology and Policy)--Massachusetts Institute of Technology, Engineering Systems Division, 2012.Cataloged from PDF version of thesis.
Includes bibliographical references (p. 75-77).
The 2005 hurricane season was particularly damaging to the United States, contributing to significant losses to energy infrastructure -much of it a result of flooding from storm surges during hurricanes Katrina and Rita. Previous research suggests that these events are not isolated, but rather foreshadow a risk that is to continue and likely increase with a changing climate (17). Since extensive energy infrastructure exists along the U.S. Atlantic and Gulf coasts, these facilities are exposed to an increasing risk of flooding. We study the combined impacts of anticipated sea level rise, hurricane activity, and subsidence on energy infrastructure in these regions with a first application to Galveston Bay. Using future climate conditions as projected by four different Global Circulation Models (GCMs), we model the change in hurricane activity from present day climate conditions in response to a climate projected in 2100 under the IPCC A l B emissions scenario using hurricane analysis developed by Emanuel (5). We apply the results from hurricane runs from each model to the SLOSH model (Sea, Lake and Overland Surges from Hurricanes) (19) to investigate the change in frequency and distribution of surge heights across climates. Further, we incorporate uncertainty surrounding the magnitude of sea level rise and subsidence, resulting in more detailed projections of risk levels for energy infrastructure over the next century. With a detailed understanding of energy facilities' changing risk exposure, we conclude with a dynamic programming cost-benefit analysis to optimize decision making over time as it pertains to adaptation.
by Megan Jeramaz Lickley.
S.M.in Technology and Policy
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Hyde, Nate. "Towards national estuarine modeling and characterization/classification systems : a pilot study for Coos Bay /". Full text open access at:, 2007. http://content.ohsu.edu/u?/etd,233.
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Wilson, Jeff. "Emplacement of the Las Tazas plutonic complex, coastal cordillera, northern Chile". Thesis, Kingston University, 1996. http://eprints.kingston.ac.uk/20601/.
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The Las Tazas Complex consists of two plutons; a granodioritic northern pluton and a monzonitic southern pluton. These were both emplaced during the Early Cretaceous along the Atacama Fault Zone during a change from dip-slip to transcurrent displacement. The Las Tazas Complex is a syntectonic intrusion. This is hased primarily on; (a) a fundamental agreement between plutonic and regional kinematic frameworks; (b) the presence of a down-temperature fabric continuum along the eastern contact of the Complex and; (c) melt-filled C' - surfaces in the wall-rocks. The Complex was emplaced under local contractional conditions during partitioned transpression. The northern pluton was emplaced during partitioned oblique dextral transpression, while the southern pluton was emplaced during east-side-down compressive dip-slip displacement. The transpressive setting suggests that the magma has actively dilated the fault surfaces under contractional conditions, rather than simply "filling in" space in dilatational jogs. Lithological zoning within the Las Tazas Complex has resulted from the open-system multiple injection of discrete magma hatches, not from the closed-system in-situ fractionation of a single parental magma body. Emplacement was characterised by periods of the multiple injection of small magma batches during fairly continuous magma production, punctuated by periods of quiescent magma production, represented by internal contacts. Emplacement-level mixing and fractionation has only occurred on a local scale during the evolution of the plutons. Geochemical models of in-situ crystallisation produce ambiguous non-unique models which can only be constrained by clear field observation. Strain-states associated with emplacement are localised phenomena, induced by a local interaction between magma supply and wall-rock displacement. On this basis strain-states in the vicinity of plutons do not reflect regional strain-states. As such, the kinematic framework and strain state associated with the emplacement of the Las Tazas Complex cannot be used to constrain the regional strain-state during the construction of the Cretaceous magmatic arc.
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Lindgren, Dan. "Form and Function of Coastal Areas". Doctoral thesis, Uppsala universitet, Luft-, vatten och landskapslära, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-150645.
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Coastal waters have high biological productivity and provide goods and services with a high monetary value. Coasts are used by many different stakeholders and are often densely populated. These factors put coastal ecosystems under heavy environmental pressure and place high demands on politicians and coastal managers, who need suitable tools to facilitate decision-making. Geographic information systems and predictive mass balance models are two such tools, and the form of coastal areas (morphometry) is an important component of both tools in coastal management. In this thesis it was shown that the form and function of coastal areas are interrelated in a number of ways. Morphometric parameters can be used to identify coastal areas that are more sensitive to pollution, or that potentially have higher ecological value; and morphometric analysis is an essential part of mass balance modeling. New ways of using morphometry for estimation of benthic production potential were presented and tested. It was shown that there are great differences in benthic production potential among Swedish coastal areas and regions. Different morphometric descriptors of openness were developed and tested; these can be used in habitat mapping or for prediction of sediment bottom types. Significant correlation was found between the morphometric properties of coastal areas, the proportion of accumulation bottom areas and the critical depth. Statistical models for prediction of accumulation bottom areas and critical depth were also obtained using multiple regression. Large differences were found in empirical values of bottom dynamic conditions from two different sources. Algorithms from a well tested mass balance model were adapted for modeling salt in the Baltic Sea. This enabled calculation of water exchange between five basins on a monthly time scale, which can be of use in future modeling studies. The study included morphometric analysis for structuring the model and for calculation of input data.
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de, Souza Machado Anderson Abel. "Coastal pollution of aquatic systems : literature review and experiments focusing on metal fate on estuaries". Thesis, Queen Mary, University of London, 2017. http://qmro.qmul.ac.uk/xmlui/handle/123456789/24637.
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Anthropocene is the current era in which human activities modify various environmental properties, which have implications for many coastal processes. Anthropogenic stressors increasingly affect coasts and push these environments to a new altered equilibrium state. However, monitoring such pollution is a challenging task because coastal systems are highly dynamic and integrate the physicochemical forces at work on freshwater bodies, estuaries and lagoons with the oceanographic characteristics of adjacent seas. The current thesis addresses pollution of coastal environments in a broad way, with special attention to the current and historic problematic of estuarine contamination by metals. Firstly, it introduces the chemical (e.g. metals, persistent organic pollutants, and emerging contaminants), physical (e.g. microplastics, sediment loads, temperature), and biological (e.g. microbiological contamination, invasive species) pervasive anthropogenic influence in coastal areas. This introductory chapter is followed by a discussion on the limitations towards holistic environmental health assessments that are imposed by the scarcity of tools and multidisciplinary approaches. At that juncture, we perform a deep investigation of metal fate and its effects in estuaries. The review of the scientific literature in the third chapter provides a transdisciplinary conceptual framework for the estuarine behaviour of metals and its impacts on fauna and flora. This comprehensive overview and conceptual model are further accompanied by an elaboration on empirical models, as well as discussion of data on metal behaviour under laboratory and field conditions. While our review postulates that most studies had observed a non-conservative behaviour of metals in estuaries, our data suggests that at local scale such phenomenon is greatly explained by a high metal mobilisation driven by biogeochemical gradients. In fact, our results demonstrate that iron mobilisation regulates the pollution levels of iron and potentially other metals in an intertidal area under strong anthropogenic influence. In summary, estuarine physicochemical gradients, biogeochemical processes, and organism physiology are jointly coordinating the fate and potential effects of metals in estuaries, and both realistic model approaches and attempts to postulate site-specific water quality criteria or water/sediment standards must consider such interactions.
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Naoum, Sherif Tsanis Ioannis K. "A hydroinformatic approach to basin/coastal water management /". *McMaster only, 2003.
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Morgan, Marcus John. "Optimal prediction of coastal acid sulphate soil severity using geographic information systems". Access electronically, 2006. http://www.library.uow.edu.au/adt-NWU/public/adt-NWU20070208.153133/index.html.
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Sara, Barghi. "Water Management Modelling in the Simulation of Water Systems in Coastal Communities". Thèse, Université d'Ottawa / University of Ottawa, 2013. http://hdl.handle.net/10393/24364.
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It is no longer a question of scientific debate that research declares our climate is changing. One of the most important and visible impacts of this phenomenon is sea level rise which has impacts on coastal cities and island communities. Sea level rise also magnifies storm surges which can have severely damaging impacts on different human made infrastructure facilities near the shorelines in coastal zones. In this research we are concerned about the proximity of water systems as one of the most vulnerable infrastructures in the coastal zones because of the impact of stormwater combining with sewage water. In Canada, the government has plans to address these issues, but to date, there needs to be further attention to stormwater management in coastal zones across the country. This research discusses the impacts of severe environmental events, e.g., hurricanes and storm surge, on the water systems of selected coastal communities in Canada. The purpose of this research is to model coastal zone water systems using the open source StormWater Management Modelling (SWMM) software in order to manage stormwater and system response to storms and storm surge on water treatment plants in these areas. Arichat on Isle Madame, Cape Breton, one of the most sensitive coastal zones in Canada, is the focal point case study for this research as part of the C-Change International Community-University Research Alliance (ICURA) 2009-2015 project.
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Saye, Samantha. "Morphology and sedimentology of coastal sand dune systems in England and Wales". Thesis, Royal Holloway, University of London, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.404502.
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Brown, Danielle C. (Danielle Collinsworth). "H₂Otel : a new model for integrating water systems and coastal architecture". Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/65171.
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Thesis (M. Arch.)--Massachusetts Institute of Technology, Dept. of Architecture, 2011.This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Only odd-numbered pages are numbered. Cataloged from student-submitted PDF version of thesis.
Includes bibliographical references (p. [116]-[118]).
During the Industrial Era, "dams, water towers, sewage systems, and the like were celebrated as glorious icons, carefully designed, ornamented, and prominently located in the city, testifying to the modern promise of progress." When technology failed to meet society's expectations, "these icons lost their mobilizing powers and began to disappear from the cityscape." These systems became material embodiments of disillusionment and emphasis shifted from the process of production to the product of production. As technological systems were visually severed from society and natural processes, water became re-conceptualized as a commodity that miraculously enters the "domestic sphere, coming from nowhere in particular." This separation between process and product has transformed consumers' perception of water into a limitless and inexhaustible resource. This misconception has placed the world's freshwater supply is in a state of crisis. Dieter Grau explains that "water is wasted all over the world, in countries with rapidly growing cities that are in the early stages of industrialization, in industrialized countries growing at a moderate rate, in regions that have little water and regions that have a lot of water." The thesis addresses these issues by re-evaluating the organizational strategy of a typical hotel design to emphasize the connection between the consumer and both active and passive water processes. The H₂Otel is a new model for coastal architecture that not only mitigates the effects of industrialization on water but also takes water out of its current status as a limitless commodity and, once again, transforms it into a valuable resource.
by Danielle C. Brown.
M.Arch.
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Quaggiotto, Maria Martina. "The role of marine mammal carrion in the ecology of coastal systems". Thesis, University of Glasgow, 2016. http://theses.gla.ac.uk/7099/.
Texto completoResumen
Carrion represents an important energy resource in the natural world, yet its ecological significance has often been overlooked. It also plays a crucial role facilitating energy transfer across trophic levels and between ecosystems. The aim of this thesis was to evaluate the role of marine mammal carrion in the ecology of coastal systems, investigating one of the most commonly occurring sources of marine mammal carrion in the UK, the grey seal (Halichoerus grypus). This was addressed by providing first a detailed documentation of the fate of a grey seal pup carcass with insights on the scavenging ecology existing in both terrestrial and marine ecosystems. On the shore, great black-backed gulls (Larus marinus), juvenile gulls and ravens (Corvus corax) fed on the carcass showing a distinct temporal succession using the food resource. The underwater carcass was initially dominated by Echinodermata (starfish), whose abundance dropped lately, while Malacostraca (crabs) were present in similar number during the whole monitoring. Bacterial activity was evident in both experiments. Predictability of seal carrion was then defined during the pupping season at one of the largest colonies in the UK, the Isle of May (Scotland). Data collected by aerial survey (11 years) and ground visual census (3 years) were used to estimate the inter-annual variability of carrion, from placentae and dead seals, according to its timing, biomass and energy released and spatial distribution on the island. For all measures considered, variability was below 34%, similarly to other resources, such as salmon runs, which appear to be predicted by consumers. Twenty one percent of the total biomass from dead seals was consumed at the end of the pupping season suggesting a clear response from the scavenging community to the presence of the resource carrion. The predictable nature of seal carrion was then tested exploring the spatial and temporal distribution of scavenging gulls at three geographical scales (regional, local and patch scales). The great black-backed gull was affected by carrion availability occurring on the Isle of May, while the herring gull (Larus argentatus) was not. In particular, the number of adult and juvenile great black-backed gulls feeding was directly correlated with carrion abundance, while searching behaviour was greatest after the mean seal pupping date and at the peak in mortality. The behavioural dynamics of scavengers were finally explored monitoring the feeding activity on pup carcasses and placentae of adult and juvenile great black-backed gulls. It was predicted that under conditions of predictable and abundant carrion an equal scavenging effort would be found for the two age classes when consuming carcasses. Hierarchical dominance was, instead, expected during scavenging activity on placenta as it represents a preferred energy-rich food item. Temporal trends of scavenging activity and time spent feeding on carcasses were in fact similar between the two, while young individuals spent more time feeding on placenta, highlighting the importance of this food source for juvenile gulls during winter. The house mouse was also found to scavenge on seal carrion, which until now has been undocumented. This study demonstrates the importance of marine mammal carrion as a resource for multiple facultative scavenger species in both the marine and terrestrial environment.
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Cawley, Jon Clayton. "Dynamic systems analysis of fossil dinoflagellates from the Atlantic Coastal Plain, USA". Thesis, This resource online, 1996. http://scholar.lib.vt.edu/theses/available/etd-09182008-063023/.
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Chien, Fang-ching. "Interaction of frontal systems with the coastal mountains of the western U.S. /". Thesis, Connect to this title online; UW restricted, 1997. http://hdl.handle.net/1773/10047.
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Franck, Travis Read. "Coastal communities and climate change : a dynamic model of risk perception, storms, and adaptation". Thesis, Massachusetts Institute of Technology, 2009. http://hdl.handle.net/1721.1/54846.
Texto completoResumen
Thesis (Ph. D.)--Massachusetts Institute of Technology, Engineering Systems Division, 2009.This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Cataloged from student submitted PDF version of thesis.
Includes bibliographical references (p. 303-311).
Climate change impacts, including sea-level rise and changes in tropical storm frequency and intensity, will pose signicant challenges to city planners and coastal zone managers trying to make wise investment and protection decisions. Meanwhile, policymakers are working to mitigate impacts by regulating greenhouse gas emissions. To design effective policies, policymakers need more accurate information than is currently available to understand how coastal communities will be affected by climate change. My research aims to improve coastal impact and adaptation assessments, which inform climate and adaptation policies. I relax previous assumptions of probabilistic annual storm damage and rational economic expectations-variables in previous studies that are suspect, given the stochastic nature of storm events and the real-world behavior of people. I develop a dynamic stochastic adaptation model that includes explicit storm events and boundedly rational storm perception. I also include endogenous economic growth, population growth, public adaptation measures, and relative sea-level rise. The frequency and intensity of stochastic storm events can change a region's long- term economic growth pattern and introduce the possibility of community decline. Previous studies using likely annual storm damage are unable to show this result. Additionally, I consider three decision makers (coastal managers, infrastructure investors, and residents) who differ regarding their perception of storm risk. The decision makers' perception of risk varies depending on their rationality assumptions.
(cont.) Boundedly rational investors and residents perceive storm risk to be higher immediately after a storm event, which can drive down investment, decrease economic 3 growth, and increase economic recovery time, proving that previous studies provide overly optimistic economic predictions. Rationality assumptions are shown to change economic growth and recovery time estimates. Including stochastic storms and variable rationality assumptions will improve adaptation research and, therefore, coastal adaptation and climate change policies.
by Travis Read Franck.
Ph.D.
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Roemer, Carina. "Factors preventing and enabling practice change: A systems social marketing study". Thesis, Griffith University, 2021. http://hdl.handle.net/10072/402244.
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Coastal water quality is changing around the world as a result of increasing terrestrial loads discharged from the land (Fabricius, 2005). This is evident for the iconic World Heritage Listed Great Barrier Reef (GBR) (Waterhouse et al., 2017). Agricultural land use and farm management practices contribute to deteriorating water quality in coral reefs (Di Bella et al., 2015; Pickering et al., 2017). Addressing on-farm practices and understanding decisionmaking behaviour is urgently needed to mitigate the impact of agriculture on environmental health (Blackstock et al., 2010; GBRWST, 2016; Rolfe & Harvey, 2017; Royle & Di Bella, 2017). The delivery of behaviour change remains a complex task. Linear causality is insufficient in its response to address complex and pressing environmental challenges. Despite significant efforts and substantial funding channelled to improve the health of the reef (Rolfe & Harvey, 2017; Trendell, 2013), concentrations of nutrients and pesticides exceeding ecosystem protection guidelines continues to occur (Brodie & Landos, 2019; Huggins et al., 2018). Achieving change requires different ways to co-create triple win solutions for all stakeholders. Social marketing is capable of addressing environmental issues (Almosa et al., 2017; Kim et al., 2020a; Truong & Dang, 2017). Social marketing creates value for individuals and societies through delivery of exchange-based solutions. It is the reliance on voluntary exchange that differentiates social marketing from other behavioural disciplines, extending approaches beyond information provision and rule setting approaches provided by educational and legislative instances respectively with delivery of programmes, products and services that people choose to exchange with. Drawing on complex exchanges, this thesis adopts a systems social marketing approach, extending beyond reductionist approaches which dominate social marketing research and practice to assess why change has or has not occurred. Conducted within a Queensland-focused farming practice change project that was delivered in Australia, this thesis reports two qualitative studies. Responding to the call to move away from social marketing’s reductionist approaches, Study 1 applied Stakeholder Theory (1984) to investigate on-ground stakeholder actions and interactions to identify factors impeding or facilitating practice change. Utilising an unstructured observational method, more than 100 hours of observations were undertaken across 48 events with as many as 150 observees. Field notes were gathered by researchers and analysis involved thematic coding focussed on understanding how stakeholders facilitated or impeded practice change. Findings suggested poor project management practices, delayed feedback loops and participating stakeholders did not freely support delivery of activities needed to support individual farming practice change. Study 2 delivered a dynamic realist evaluation methodology. Informed by systems thinking, a Creating Collective Solution (CCS) 4-stage process was applied culminating in a ½ day facilitated workshop involving 20 diverse stakeholders including government, extension service providers, agronomists, farmers, chemical resellers, contractors and natural resource management stakeholders. Stakeholders were diverse representing multiple levels in the system. Across the CCS process 35 diverse stakeholders identified 219 barriers in response to one trigger question set by the Project Working Group. Consensus voting was used to identify 12 priority barriers. An action map, demonstrating aggravation points for 11 out of 12 prioritised barriers, emerged. Stakeholders co-designed solutions for implementation to address water quality including Bottom up initiatives, Extend the evidence base and local knowledge, Expert support services, Enhanced communication effectiveness and Industry engagement. The CCS process created buy-in from the vast agricultural industry and provided a unique opportunity for stakeholders to interact and engage with each other resulting in hard conversations, emotional responses and a willingness to be involved in efforts needed to realise the outcomes sought. Taken together, this thesis contributes to social marketing knowledge and practice. This thesis directs focus away from reductionist approaches, adopting and promoting the need for holistic approaches which acknowledge the interconnected web of exchange relationships and diverse stakeholder actions that are constantly interacting to support or prevent the desired outcomes from occurring. Application of a systems social marketing approach can foster shared responsibility and it can enable co-creation of value-based solutions to guide implementation and subsequent programme evaluation. This research delivers a transdisciplinary approach focused on generating collective solutions to ensure a shared implementation agenda that allows for monitoring and measuring against outcomes that are agreed upon by diverse stakeholders. A triple win can direct change efforts to create holistic buy-in and to account for external factors and actors with the potential of resetting the behavioural change agenda to reach set targets. Limitations of the thesis and future research directions are outlined.Thesis (PhD Doctorate)
Doctor of Philosophy (PhD)
Dept of Marketing
Griffith Business School
Full Text
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Roca, Bosch Elisabet. "Bringing Public Perceptions in the Integrated Assessment of Coastal Systems. Case studies on beach tourism and coastal erosion in the Western Mediterranean". Doctoral thesis, Universitat Autònoma de Barcelona, 2008. http://hdl.handle.net/10803/4976.
Texto completoResumen
La tesis aplica el pensamiento sistémico y la Evaluación Integrada (IA) al campo de la gestión costera. En particular, se analiza la contribución que el estudio de las percepciones aporta a los procesos de evaluación ambiental de los sistemas costeros, para mejorar las deficiencias de los métodos más convencionales caracterizados por su unidimensionalidad y dependencia del conocimiento disciplinar. Se han realizado tres estudios de caso relativos a la calidad de las playas en ambientes turísticos y a la erosión costera. El primer caso se ha desarrollado en la zona de la Costa Brava, al Nordeste España. El caso afronta la necesidad de incorporar la perspectiva del usuario a los métodos de evaluación de la calidad de la Playa. Se realizaron 600 cuestionarios a los usuarios de las playas y un conjunto de entrevistas en profundidad a actores locales. Los resultados muestran que los estudios de percepción pueden ser instrumentos muy útiles para los gestores costeros, aportando información sobre el perfil del usuario, sus preferencias y sus valoraciones sobre la calidad de las playas. En estos contextos los sistemas costeros deberían ser gestionados adaptándose a las particularidades ambientales de cada playa y a la diversidad de sus usuarios, evitando prácticas de homogeneización.
El segundo caso trata el problema de la erosión costera. El estudio se localiza en Sitges (Cataluña, España) donde se analiza un conflicto social surgido a principios del 2000 como reacción a una propuesta de intervención para frenar la erosión existente. La investigación explora los elementos que dificultan dar respuestas integradas a la erosión costera a partir de un estudio de percepción basado en entrevistas en profundidad. La complejidad e incertidumbre ligadas a los propios procesos erosivos, las características de los marcos de evaluación existentes y el contexto institucional en el campo de la protección costera en España son algunos de las cuestiones analizadas. El estudio muestra como el conocimiento técnico no es suficiente para encontrar soluciones coherentes i sólidas con el contexto local y las necesidades sociales y constata la necesidad de incorporar enfoques más participativos.
Finalmente, el tercer caso se desarrolló en el Lido de Séte (Francia) y explora los beneficios de aplicar un Análisis Multicriterio Participativo (AMP) para evaluar estrategias de gestión de la erosión costera. Los resultados muestran que las alternativas más adaptativas como el retroceso controlado de la línea de costa y la recuperación de la dinámica natural son socialmente más aceptados, en el caso de estudio, que alternativas más rígidas basadas en enfoques ingenieriles. El enfoque utilizado contribuye a representar la multidimensionalidad de la costa, integra diferentes perspectivas, facilita el intercambio de conocimiento y permite el tratamiento de la incertidumbre.
La disertación concluye ofreciendo una propuesta metodológica para incorporar la dimensión social en la evaluación integrada de sistemas costeros.
The present dissertation applies complex system thinking and Integrated Assessment (IA) to the field of coastal management. It emphasises the social perspective and analyses the added value of integrating public perceptions into the processes of assessing coastal socio-ecological systems. It argues that the Integrated Assessment of coastal systems requires moving away from one-dimensional evaluation methods and to develop innovative assessment approaches capable to understand coasts in as highly complex, multidimensional dynamic systems and explicitly acknowledge their inherent degree of uncertainty.
Three case studies have been carried out regarding the assessment of beach quality and coastal erosion. The first one was developed in the area of "Costa Brava", North-East Spain, a tourist hotspot. The case study addressed the lack of bottom-up approaches to assess beach quality. The methods, which were applied on six beaches, involved a survey of 600 beach-users and a set of in-depth interviews to local stakeholders. The results showed that public perception surveys can be useful tools for coastal managers. Coastal systems should be specifically managed in an adaptive fashion considering the particularities of each beach and avoiding homogenising practices. In this way, conservation strategies could be prioritised in natural environments with recognised natural values or with higher potential for ecological recovery. While in the other hand, 'hard' interventionist approaches oriented to enhance recreational beach uses could be pursued in those intensively used beaches, normally located along urban water fronts.
The second case deals with coastal erosion. It was carried out in Sitges (Catalonia, Spain) and analyzed a conflict that arose at the beginning of the year 2000 as a reaction to a proposal for intervention to cope with coastal erosion. The research explored the elements that make it difficult to give integrated responses to coastal erosion. In this case, the research of public perception was based on in-depth interviews. Issues related to the very nature of the coastal systems - complexity and uncertainty of coastal erosion- were addressed. Furthermore, the work explored the drawbacks of the existing assessment approaches and the policy framework on coastal protection in Spain. The case study showed that the technical knowledge does not fit enough to find robust solutions that satisfy both social needs and technical requirements. The complexity of coastal erosion risks demands to move beyond the existing assessment frameworks where the role of the experts need to be reformulated. This process should open up the debate to other disciplines and knowledge which may bring more adaptive alternatives more in coherence with natural dynamics of coastal systems.
The third case was carried out in the Lido of Séte (France) and explored the suitability of applying participatory MultiCriteria Analysis (MCA) to assess different strategies to cope with coastal erosion risks. The methods used involved the Social Multicriteria Evaluation tool of Naiade combined with in-depths interviews and focus groups. Results showed that more adaptive alternatives such as "retreating the shoreline" were preferred by selected stakeholders to those corresponding to "protecting the shoreline" and the Business as Usual proposals traditionally put forward by experts and policy makers on these matters. Participative MCA contributed to represent coastal multidimensionality, elicit and integrate different views and preferences, facilitated knowledge exchange, and allowed highlighting existing uncertainties.
The dissertation concludes by drawing a methodological proposal on how to bring social perspective into the assessment of coastal systems. A 3-step procedure is put forward which includes the following: i) a baseline analysis of the values and perceptions of the society under study; ii) institutional analysis and maping out the stakeholders' relationships in order to identify barriers and opportunities to implementing integrated strategies and, iii) a public participation within the assessment process. We argue that all this in-depth knowledge on the functioning of the social system needs to be combined with an in-depth understanding of the dynamics of the ecological system under consideration.
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Van, Der Schyff Malikah. "Using hydrogeochemistry and geophysical techniques to determine the extent of connectivity between Langerban road and Elandsfontein aquifer system, West Coast, South Africa". University of Western Cape, 2020. http://hdl.handle.net/11394/7308.
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Magister Scientiae (Integrated Water Resource Management)The heterogeneity in groundwater systems suggest that not all aquifers are connected in groundwater systems. This study is about the interaction between aquifers within groundwater system. Langebaan Road and Elandsfontein aquifers in the West Coast groundwater aquifer system were chosen as case studies. These units were chosen because the previous studies on groundwater excluded the aspect of connectivity between aquifers from methods perspective which is the focus on the current study. The second reason for the study area was the present of human activities and ecosystems which are proved to be groundwater dependents. Aquifer-aquifer interaction refers to hydraulic connection between two aquifers. The interaction is influenced by hydraulic pressure and lithology of geological strata, their integrity and spatial continuity. While factors for such connectivity are well known, appropriate techniques to establish the extent of connectivity remain poorly understood and hence the need to employ various techniques so that the extent of connectivity between the two aquifers is established. Understanding the connectivity between aquifers is important because such connectivity explains the pathways for the availability of groundwater in each aquifer unit and the associated groundwater quality in each unit that supports human activities and sustain ecological systems.
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Strong, John Daniel. "Generating Revenue at Airports in the Southeastern Coastal Region of North Carolina". ScholarWorks, 2018. https://scholarworks.waldenu.edu/dissertations/4760.
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Airports contribute about 5% of the gross domestic product and employ over 7 million people in the United States. The purpose of this qualitative multiple-case study was to explore the strategies that airport managers need to increase nonaeronautical revenue. A generic strategy does not exist to assist airport operators in generating operating income. Aeronautical revenue does not always provide sufficient funding for airport operations and existing research does not consistently provide effective strategies for all airports to generate revenue. The sample for this qualitative multiple case study consisted of 3 small commercial airport managers in the southeastern North Carolina coastal region. The conceptual framework for this study was built upon general systems theory. The data were collected using semistructured interviews and review of company documents. Transcript review and member checking were used to strengthen credibility and trustworthiness. Through methodological triangulation of the data sources, 3 emergent themes were uncovered during a qualitative data analysis: types of nonaeronautical sources of revenue, strategies for measurement of success, and size and location of the airport. The findings from this study may contribute to social change by providing insight into strategies that contribute to sustainability at small airports. Existing and aspiring small airport managers may apply the findings to contribute to the success of the communities in which their airports reside and the local economies in which they operate.
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Evans, Dennis C. (Dennis Christopher). "Predictors of successful outcomes of U.S. Coast Guard construction contracts". Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/67551.
Texto completoResumen
Thesis (S.M. in Engineering and Management)--Massachusetts Institute of Technology, Engineering Systems Division, System Design and Management Program, 2011.Cataloged from PDF version of thesis.
Includes bibliographical references (p. 117-118).
The U. S. federal government contracts over five hundred billion dollars in goods and services each year. Traditionally, these contracts are awarded on the basis of a combination of a contractor's proposed cost, quality, technical capability and demonstrated past performance. While all valid and important comparators, the overall quality and customer satisfaction achieved at the completion of contracts awarded on these bases remains highly variable from contract-to-contract. This thesis examines potential reasons for the variability of these results and further proposes additional factors for contract evaluation and award that should improve the chances for successful contract outcomes. Twenty four randomly selected and recently completed U. S. Coast Guard construction contracts were used as the basis for study. The documented performance information for each contract was compared against contract demographic information in a search for correlations that are predictive of the likelihood of a high level of contract satisfaction. Contract performance ratings, contract timeliness and contract on-budget performance were compared to overall contractor annual revenue, total contractor employees, the relative contract size and a contractor's revenue per employee. The main finding is that total contractor revenue, relative contract size (higher is better) and contractor revenue per employee (higher is better) are reliable predictors of performance and should be considered as relevant source selection factors for negotiated contracts. Capable small contractors should be selected not simply as a matter of conformance to a social program, but because the expected results are higher. In addition, the following recommendations apply in order to maximize the probability of positive performance outcomes on U. S. Coast Guard construction contracts: 1) Improve the collection and utilization of past performance data. 2) Minimize sealed-low bid contracting. 3) Maximize contracts by negotiation. 4) Maximize the usage of small businesses, above the "micro-small" level.
by Dennis C. Evans.
S.M.in Engineering and Management
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Restrepo, Ana Catalina. "Analysis of storm surge impacts on transportation systems in the Georgia coastal area". Thesis, Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/42897.
Texto completoResumen
Many Climate Scientists believe that global warming will produce more extreme weather events such as tropical storms, hurricanes, intense rainfall, and flooding. These events are considered to be the most catastrophic natural events for transportation systems especially in coastal areas. Due to the severe damage from storm surge and flooding. Evaluating the magnitude of possible storm surges and their impacts on transportation systems in coastal areas is fundamental to developing adaptation plans and impact assessments to mitigate the damage.
This thesis focuses on existing transportation systems in the Georgia coastal area that could be affected by several storm surges. An existing storm surge model is used to estimate the storm surges and the surge heights based on the category, direction, and forward speed of a storm. The ground elevation of the ports, interstates, state roads, railroads, and the principal airports on the Georgia coast are identified through a GIS analysis using the national elevation data set. Having the storm surge elevation and the elevation of the existing infrastructure, a GIS study is performed to identify those parts of the transportation system that will be affected by each type of storm giving results such as the length or sections of transportation assets under or above the surge elevation. A literature review of storm surge, rising sea levels, and their impacts on coastal bridges, roads, airports, ports, and railroads is presented in the thesis. Also, a description of the software used to analyze and estimate the impacts of climate change on transportation systems is described.
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Amri, Andi. "Silvo-fishery systems and sustainable management of coastal resources in South Sulawesi, Indonesia". 京都大学 (Kyoto University), 2005. http://hdl.handle.net/2433/145173.
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Kyoto University (京都大学)0048
新制・課程博士
博士(地域研究)
甲第11703号
地博第17号
新制||地||6(附属図書館)
23346
UT51-2005-D452
京都大学大学院ｱｼﾞｱ・ｱﾌﾘｶ地域研究研究科東南ｱｼﾞｱ地域研究専攻
(主査)教授 田中 耕司, 教授 山田 勇, 助教授 岩田 明久
学位規則第4条第1項該当