Dissertationen zum Thema „Coastal observations“
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Haynes, Ronald. „Eulerian and Lagrangian observations in the Iberian coastal transition zone“. Thesis, Bangor University, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.358594.
Der volle Inhalt der QuelleEarlie, Claire Siobhan. „Field observations of wave induced coastal cliff erosion, Cornwall, UK“. Thesis, University of Plymouth, 2015. http://hdl.handle.net/10026.1/3526.
Der volle Inhalt der QuelleJiang, Lide. „A comprehensive study on coastal upwelling using observations, models and proxies“. Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 140 p, 2008. http://proquest.umi.com/pqdweb?did=1654491231&sid=5&Fmt=2&clientId=8331&RQT=309&VName=PQD.
Der volle Inhalt der QuelleYang, Bo. „Field Observations and Novel Methodologies for Carbon System Assessments in Coastal Waters“. Scholar Commons, 2015. http://scholarcommons.usf.edu/etd/5804.
Der volle Inhalt der QuelleFurst, Jonathan Joseph. „An Investigation of Vertical Turbulent Transport Processes in Coastal Regions Using Tower Observations“. FIU Digital Commons, 2013. http://digitalcommons.fiu.edu/etd/814.
Der volle Inhalt der QuelleStenlid, Aron. „Cloud Observations at a Coastal site – Analysis of Ceilometer Measurements from Östergarnsholm, Sweden“. Thesis, Uppsala universitet, Luft-, vatten och landskapslära, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-380863.
Der volle Inhalt der QuelleTrainor, Lincoln Thomas. „Field observations and SWAN model predictions of wave evolution in a muddy coastal environment“. Thesis, Monterey, Calif. : Naval Postgraduate School, 2009. http://edocs.nps.edu/npspubs/scholarly/theses/2009/Jun/09Jun%5FTrainor.pdf.
Der volle Inhalt der QuelleThesis Advisor(s): Herbers, Thomas H. C. ; Janssen, Tim T. "June 2009." Description based on title screen as viewed on July 14, 2009. Author(s) subject terms: ocean waves, continental shelf, mud, littoral, SWAN. Includes bibliographical references (p. 69-71). Also available in print.
Moncuquet, Adèle. „Coastal internal waves on the Bay of Biscay shelf and their impact on cross-shelf transport“. Electronic Thesis or Diss., Brest, 2024. http://www.theses.fr/2024BRES0010.
Der volle Inhalt der QuelleThe Bay of Biscay (BoB) is a hot spot for the generation of internal tides and nonlinear internal waves (NLIW). Previous studies have focused mainly on the seaward propagation of internal waves, and less on the shoreward propagation. The shelf region can be affected by internal tides and NLIW transport. The shelf is a complex hydrodynamical region and processes of different scales modify the background stratification and currents. Therefore, internal waves transform as they propagate across the shelf. Internal wave transformation on the shelf and the induced transport remain poorly described worldwide, especially on the BoB shelves. In this thesis, we describe the internal tide and NLIW from mooring observations on the BoB shelf and the induced cross-shelf transport. First, we describe the internal tide and NLIW on the Aquitaine shelf using 22 days of measurements (at 62 and 153 m depth). The results highlight the unexpected importance of the internal tide and NLIW during summer-time stratified conditions. NLIW of depression and elevation, with amplitude reaching up to 1/4th of the water depth and propagating shoreward with different speeds were observed. We observed conditions in which depression and elevation waves coexisted within the same internal tide phase, and could potentially interact. The second part of the work is dedicated to crossshelf net transport, associated with internal waves, or internal waves pumping (IWP) on both the Aquitaine and the Armorican shelf. On the Armorican shelf, IWP was the main driver of total transport near the boundaries and counterbalanced the subtidal dynamics in the middle of the water column. On the Aquitaine shelf, the total cross-shelf transport was a combination of subtidal transport and IWP
Trasvina, Castro Armando. „Offshore wind forcing in a coastal ocean : observations and modelling of the Gulf of Tehuantepec, Mexico“. Thesis, Bangor University, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.292249.
Der volle Inhalt der QuelleFong, Derek Allen. „Dynamics of freshwater plumes: observations and numerical modeling of the wind-forced response and alongshore freshwater transport“. Thesis, Massachusetts Institute of Technology, 1988. http://hdl.handle.net/1721.1/58510.
Der volle Inhalt der QuelleIncludes bibliographical references (leaves 163-172).
A freshwater plume often forms when a river or an estuary discharges water onto the continental shelf. Freshwater plumes are ubiquitous features of the coastal ocean and usually leave a striking signature in the coastal hydrography. The present study combines both hydrographic data and idealized numerical simulations to examine how ambient currents and winds influence the transport and mixing of plume waters. The first portion of the thesis considers the alongshore transport of freshwater using idealized numerical simulations. In the absence of any ambient current, the downstream coastal current only carries a fraction of the discharged fresh water; the remaining fraction recirculates in a continually growing "bulge" of fresh water in the vicinity of the river mouth. The fraction of fresh water transported in the coastal current is dependent on the source conditions at the river mouth. The presence of an ambient current augments the transport in the plume so that its freshwater transport matches the freshwater source. For any ambient current in the same direction as the geostrophic coastal current, the plume will evolve to a steady-state width. A key result is that an external forcing agent is required in order for the entire freshwater volume discharged by a river to be transported as a coastal current. The next section of the thesis addresses the wind-induced advection of a river plume, using hydrographic data collected in the western Gulf of Maine. The observations suggest that the plume's cross-shore structure varies markedly as a function of fluctuations in alongshore wind forcing. Consistent with Ekman dynamics, upwelling favorable winds spread the plume offshore, at times widening it to over 50 km in offshore extent, while downwelling favorable winds narrow the plume width to a few Rossby radii. Near-surface current meters show significant correlations between cross-shore currents and alongshore wind stress, consistent with Ekman theory. Estimates of the terms in the alongshore momentum equation calculated from moored current meter arrays also indicate an approximate Ekman balance within the plume. A significant correlation between alongshore currents and alongshore wind stress suggests that interfacial drag may be important. The final section of the thesis is an investigation of the advection and mixing of a surface-trapped river plume in the presence of an upwelling favorable wind stress, using a three-dimensional model in a simple, rectangular domain. Model simulations demonstrate that the plume thins and is advected offshore by the cross shore Ekman transport. The thinned plume is susceptible to significant mixing due to the vertically sheared horizontal currents. The first order plume response is explained by Ekman dynamics and a Richardson number mixing criterion.
by Derek Allen Fong.
Ph.D.
Pannimpullath, Remanan Renosh. „Characterisation of the coupling between oceanic turbulence and the variability of coastal waters optical properties using in situ measurements and satellite data“. Thesis, Lille 1, 2015. http://www.theses.fr/2015LIL10036/document.
Der volle Inhalt der QuelleThe objective of this thesis is to understand the coupling processes between turbulence and particulate matter (suspended sediment and phytoplankton). The first part of the thesis is on in situ measurements performed under different meteorological situations. We selected the attenuation coefficient as a proxy for the total concentration of particles and in situ measurement of particle size distribution (PSD) spectrum. This study showed that the dynamics of the PSD is controlled by many oceanographic parameters such as tidal currents, waves and turbulence. We also studied the multifractal characteristics of these PSD for various size classes (silt, fine, coarse and macro particles). For that, we used Empirical Mode of Decomposition along with the Hilbert Spectral Analysis. The second part of the thesis focuses on the multi-scale analysis of satellite ocean colour and SST images. The spatial heterogeneity of oceanic scalars (phytoplankton and sea surface temperature) under the turbulence influence is considered at different scales. This method also works with images having missing data. Finally, this methodology using 2D structure functions, was applied to real images of Chl-a, SST, Rrs-443 and Rrs-555. It is possible to characterize, for all spatial scales and all intensities, the heterogeneities and intermittencies of the studied scalar fields, using a few parameters (2 parameters in the framework of the lognormal approximation). The values of these parameters, for 7 different locations, are discussed and compared
Virmani, Jyotika I. „Ocean-atmosphere interactions on the West Florida shelf“. [Tampa, Fla.] : University of South Florida, 2005. http://purl.fcla.edu/fcla/etd/SFE0001141.
Der volle Inhalt der QuelleBracci, Alessandro <1982>. „Comprehensive characterization of snowfall in terms of microphysical features, quantitative precipitation estimation and scavenging properties by in situ and remote sensing observations at an Antarctic coastal site“. Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2022. http://amsdottorato.unibo.it/10015/1/Bracci_Alessandro_PhD_Thesis.pdf.
Der volle Inhalt der QuelleHu, Ziyuan. „Structures tourbillonnaires à l'ouest du golfe du Lion : modélisation numérique et mesures en mer“. Thesis, Aix-Marseille 2, 2011. http://www.theses.fr/2011AIX22012.
Der volle Inhalt der QuelleIn the western part of the Gulf of Lion, Millot (1979, 1982) had postulated the presence of mesoscale anticyclonic eddies. As already well studied in the open ocean, such structures could also play, in the coastal zone, an important role on the circulation and biogeochemistry, as well as on the coastal-offshore exchanges of energy and mass. The objectives of this PhD thesis is to characterize the anticyclonic eddies present in the western part of the Gulf of Lion and to understand their generation processes, using in a combined way numerical modelling and in situ measurements. The numerical model SYMPHONIE is used to simulate realistically the circulation of the Gulf of Lion, in order to help us understand the dynamics of such structures. A sensitivity analysis has been carried out, varying the model spatial resolution and the horizontal viscosity, to choose the best model configuration. A wavelet technique is applied on model outputs to identify eddies and estimate their characteristics (duration, size...). The numerical results have been used to set up the sampling strategy of the LATEX cruises and help us interpret in situ data. The analysis of the measurements collected during Latex08 (September 1-6 , 2008) confirmed the presence of an anticyclonic eddy in the western part of the Gulf of Lion and showed that its features agree with the ones of the simulated eddy. These in situ data, combined with the modeling results, allow us to better understand the eddies' dynamics. Thanks to a long period simulation (2001-2008) with the appropriate model configuration, we studied the repetitiveness and variability of the eddies, as well as their generation processes. Modeling results showed that during the 8 years of simulation, coastal anticyclonic eddies are present regularly, from May to October, in the western part of the Gulf of Lion with a life duration varying from several days to more than two months. The eddies with a life duration longer than 15 days need two conditions to be generated: a persistent and strong northwest wind and a strong stratification. Annual and interannual differences between the eddies present in the 8 years of simulation can be explained by varying the intensity of each of the two conditions
Brodie, Katherine L. „Observations of storm morphodynamics using Coastal Lidar and Radar Imaging System (CLARIS): Importance of wave refraction and dissipation over complex surf-zone morphology at a shoreline erosional hotspot“. W&M ScholarWorks, 2010. https://scholarworks.wm.edu/etd/1539616582.
Der volle Inhalt der QuelleLiu, Yonggang. „Patterns and dynamics of ocean circulation variability on the West Florida shelf“. [Tampa, Fla] : University of South Florida, 2006. http://purl.fcla.edu/usf/dc/et/SFE0001413.
Der volle Inhalt der QuelleGoberville, Eric. „Evolution décennale des zones côtières : forçages climatiques, forçages anthropiques“. Thesis, Bordeaux 1, 2010. http://www.theses.fr/2010BOR14171/document.
Der volle Inhalt der QuelleCovering only 8% of the World Ocean but with 85% of exploited marine resources, coastal systems are important areas for the exchange of materials and energy, playing a crucial role in biogeochemical cycles. Moreover, these environments are marked by strong spatial and temporal heterogeneity of environmental factors, contributing to their complexity. In recent decades, global change exerted on these systems has become so intense that the implementation of long-term monitoring programmes has become essential to extract major trends and predict potential changes. However, the identification of the specific response of these coastal systems remains posed. In France, monitoring of physical and chemical parameters of coastal waters is provided since 1997 by the programme SOMLIT (Service d'Observation en Milieu LITtoral). The aim of this PhD Thesis is therefore to characterize year-to-year variability in physic-chemical properties of the surface layer, at a decadal scale, of the French coastal systems, and to evaluate the respective influence of natural and anthropogenic variability. Firstly, the analysis of these time series shows that the French coastal systems exhibit significant temporal variability, due to hydro-climatic fluctuations at meso and regional scales. Secondly, the development of a new nonparametric multivariate procedure, resulting in the constitution of relative reference states for the rapid detection of changes, allows quantifying the fertilization in nutrient concentrations. Moreover, it is shown that fertilization can be strongly influenced by climate forcing. Thirdly, after the removal of natural climate variability, indicators of human fertilisation are proposed, allowing the quantification of the impact of human activities on French coastal systems. This study proposes a new approach to detect as soon as data become available, potential alterations in all types of systems, with the aim of meeting the scientific and societal assumptions and allowing the adaptive management of coastal environments
Pinault, Jonas. „Study of swash motion in an embayed beach based on observations and phase-resolving wave modeling - Case of the Grande Plage of Biarritz“. Electronic Thesis or Diss., Pau, 2022. http://www.theses.fr/2022PAUU3015.
Der volle Inhalt der QuelleDue to the ever growing anthropogenic pressure at the coast and the perspectives of sea levelrise, coastal hazards such as overtoping are more threatening than ever. In this context, accurateestimations of the wave contributions to the total water level (TWL) at the shoreline, namelythe run-up, are crucial for coastal engineers and those involved in coastal zone managementand engineering design. In this work, we propose to investigate wave run-up in an urban-ized embayed beach based on observations and phase-resolving numerical modeling. First, thephase-resolving model based on the Boussinesq equations BOSZ is validated against laboratoryLiDAR measurements to provide an extensive validation and sensitivity analysis. Then, themodel is applied to the real configuration of the Grande Plage of Biarritz, a complex urbanizedembayed beach. A data-set from a 3-day field campaign carried out in 2018 including pressuremeasurements and video-derived run-up data is utilized for the model validation. These ap-plications demonstrate that the model reproduces wave transformations and subsequent swashmotions reasonably well. The validated model results and observations are then used to investi-gate the swash motions, under varying conditions of waves and tide. Results show that the tidallevel played a key-role in the swash dynamics. At low tide, the conditions were dissipative andthe swash was dominated by the infragravity motions. At high tide reflective conditions wereobserved with a domination of the short-wave frequencies. These changes are explained by thedouble-slope profile where a low sloping area is found in the intertidal zone and a steep slope onthe foreshore. The tidal modulation also influenced the dissipation of infragravity waves, whichwere found to dissipate energy substantially at low tide through breaking, while at mid andhigh tide standing wave patterns, characteristic of shoreline reflection, were observed. Underenergetic conditions the influence of the tide was minimized as the large waves tended to breakon the low sloping portion, regardless of the tide. These results highlight the complexity of theswash behavior in 3D conf
McCarthy, Bradley L. „Coastal bathymetry using 8-color multispectral satellite observation of wave motion“. Thesis, Monterey, California. Naval Postgraduate School, 2010. http://hdl.handle.net/10945/5199.
Der volle Inhalt der QuelleCoastal bathymetry was measured using wave motion as observed by a commercial satellite imaging system. The linear finite depth dispersion relation for surface gravity waves was used to determine nearshore ocean depth from successive images acquired by the WorldView-2 satellite of the coastal area near Camp Pendleton, California. Principal component transforms were performed on co-registered images and principal component four was found to very effectively highlight wave crests in the surf zone. Change detection images, which included principal component four from successive images, contained both spatial and temporal information. From these change detection images, wave celerity could be determined and depth inversion could be performed. For waves farther from shore, principal component four no longer highlighted wave crests. Waves could be resolved within a single RGB composite image with equalization enhancement. The wavelength of a wave above a known depth was measured and the wave period method was used to determine depth for other waves in the propagation direction of this wave. Our depth calculations compared favorably to our reference bathymetry. The spatial resolution for this method of determining depth is higher and perhaps more accurate than our reference bathymetry, particularly in the surf zone.
Shi, Shaozhong. „Observational and theoretical aspects of tsunami sedimentation“. Thesis, Coventry University, 1995. http://curve.coventry.ac.uk/open/items/0a4c8219-19e9-a6c2-4417-440b0e84702e/1.
Der volle Inhalt der QuelleMyrick, Kenneth B. „Coastal bathymetry using satellite observation in support of intelligence preparation of the environment“. Thesis, Monterey, California. Naval Postgraduate School, 2011. http://hdl.handle.net/10945/5519.
Der volle Inhalt der QuelleSubaqueous beach profiles are obtained for littoral regions near Camp Pendleton, CA, using observations of wave motion. Imagery was acquired from WorldView2 Satellite on 24 March 2010. Two sequential images taken 10 seconds apart are used for the analyses herein. Water depths were calculated using linear dispersion relationship for surface gravity waves. Depth profiles were established from shoreline out to 1 kilometer offshore and depths of up to 15 meters. Comparisons with USGS DEM values show agreement within five percent in the surf zone (shoreline to wave breaking) and one percent outside the surf zone (offshore of wave breaking).
Sopko, Steven P. „Observation and analysis of coastally trapped wind reversals“. Thesis, Monterey, California. Naval Postgraduate School, 1998. http://hdl.handle.net/10945/8756.
Der volle Inhalt der QuelleDuring the warm season (April-September), the California coast is under the influence of persistent northwesterly flow. Periodically, this flow is replaced by a narrow band of southerly winds along the coast. The transition to southerly flow is often accompanied by a rise in sea-level pressure, lower temperatures, coastal stratus, and fog. The mesoscale disturbance responsible for this southerly transition has become known as a coastally trapped wind reversal (CTWR). While it is clear that these mesoscale disturbances are forced by the interaction of the coastal topography with the synoptic-scale flow, the exact mechanisms for their development and their governing dynamics remain the subject of much debate. The present study examines three cases from 1996 that appear to have the characteristics of a CTWR. Each case is analyzed to determine the associated synoptic-scale forcing and the respective mesoscale structure. The observed synoptic-scale forcing is compared to the results of a climafological study conducted by Mass and Bond (1996). Results from a modeling study by Skamarock et al. (1998) are used to create a conceptual model for comparison with the observed development and mesoscale% structure of each event. Results of this study show that only two of the cases can be classified as a CTWR. The study also shows that variability exists in the synoptic-scale forcing associated with the initiation of a CTWR. Two mechanisms for the development of the offshore mesoscale low, and ultimately the CTWR, have been identified. The variability of the mesoscale structure in each CTWR is also documented
Besset, Manon. „Morphodynamique récente, évolution et vulnérabilité des littoraux deltaïques : une analyse globale“. Electronic Thesis or Diss., Aix-Marseille, 2017. http://theses.univ-amu.fr.lama.univ-amu.fr/171122_BESSET_150scdmpz142i993bv93l_TH.pdf.
Der volle Inhalt der QuelleRiver deltas are rich and fragile ecosystems. Deltas depend on fluvial sediment supply to balance natural subsidence and erosion caused by waves and currents. Deltas are mainly affected by river flooding, marine submersion. However, deltas are strategic sites of human settlement, economic hotspots, and geopolitical issues. This attraction increases the pressure, rendering these deltas more and more exposed to risks and vulnerable.The main objective of this thesis is to analyze the past and present functional dynamics of delta shorelines based on 60 of the world’s deltas and a holistic and systemic approach with spatial, environmental, and societal data. After the study of recent coastal evolution showing a tendency to decreasing progradation of many deltas, a conceptual and qualitative classification of deltaic morphology based on fluviomarine influences was conducted. Updating of this classification and the proposal of new approaches, in terms of morphology, dynamics, and vulnerability, have necessitated revisiting these older schemes, and the adoption of a methodological and interpretative approach aimed at quantification of the weight of each of these three parameters showing the complexity of the interactions. The thesis proposes a new quantitative and objective classificatory framework, including the human dimension. Finally, the thesis highlights the responses of deltaic shorelines to exceptional perturbations, and highlights the limits of resilience. The thesis advises over the impact of humans on these fragile coastal environments, the equilibrium of which strongly depends on sediment supply. This fragility is further exacerbated by the impacts of climate change
Bracci, Alessandro. „Analysis of precipitation from ground observations over the Antarctic coast“. Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018. http://amslaurea.unibo.it/16875/.
Der volle Inhalt der QuelleTutsak, Ersin. „Analyses Of Atmospheric And Marine Observations Along The Turkish Coast“. Master's thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12615752/index.pdf.
Der volle Inhalt der QuelleInch, Kris William. „Field observations of infragravity wave response to variable sea-swell wave forcing“. Thesis, University of Plymouth, 2017. http://hdl.handle.net/10026.1/10164.
Der volle Inhalt der QuelleBesset, Manon. „Morphodynamique récente, évolution et vulnérabilité des littoraux deltaïques : une analyse globale“. Thesis, Aix-Marseille, 2017. http://www.theses.fr/2017AIXM0326/document.
Der volle Inhalt der QuelleRiver deltas are rich and fragile ecosystems. Deltas depend on fluvial sediment supply to balance natural subsidence and erosion caused by waves and currents. Deltas are mainly affected by river flooding, marine submersion. However, deltas are strategic sites of human settlement, economic hotspots, and geopolitical issues. This attraction increases the pressure, rendering these deltas more and more exposed to risks and vulnerable.The main objective of this thesis is to analyze the past and present functional dynamics of delta shorelines based on 60 of the world’s deltas and a holistic and systemic approach with spatial, environmental, and societal data. After the study of recent coastal evolution showing a tendency to decreasing progradation of many deltas, a conceptual and qualitative classification of deltaic morphology based on fluviomarine influences was conducted. Updating of this classification and the proposal of new approaches, in terms of morphology, dynamics, and vulnerability, have necessitated revisiting these older schemes, and the adoption of a methodological and interpretative approach aimed at quantification of the weight of each of these three parameters showing the complexity of the interactions. The thesis proposes a new quantitative and objective classificatory framework, including the human dimension. Finally, the thesis highlights the responses of deltaic shorelines to exceptional perturbations, and highlights the limits of resilience. The thesis advises over the impact of humans on these fragile coastal environments, the equilibrium of which strongly depends on sediment supply. This fragility is further exacerbated by the impacts of climate change
Bolduc, Steven J. WEATHER FORECASTING METEOROLOGICAL PHENOMENA WEATHER STATIONS COASTAL REGIONS NETWORKS WIND THESES ATMOSPHERIC MOTION METEOROLOGICAL DATA KINETIC ENERGY METEOROLOGY RADIOSONDES POTENTIAL ENERGY PACIFIC OCEAN MOISTURE HEAT FLUX. „Fluxes across the west coast resolved by Picket Fence observations during STORMFEST /“. Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1994. http://handle.dtic.mil/100.2/ADA288511.
Der volle Inhalt der QuelleThesis advisor(s): Paul A. Hirschberg, Russell L. Elsberry. "September 1994." Bibliography: p. 56-57. Also available online.
Bolduc, Steven J. „Fluxes across the west coast resolved by Picket Fence observations during STORMFEST“. Thesis, Monterey, California. Naval Postgraduate School, 1994. http://hdl.handle.net/10945/28225.
Der volle Inhalt der QuelleMeteorological features that force mesoscale weather systems that develop in the central U.S. often form far upstream over the data-sparse Pacific Ocean. It is hypothesized that the temporal and spatial resolution of the current rawinsonde network along the west coast may not he sufficient to detect and measure flow features moving inland. During the STORMFEST experiment in February-March 1992, a Picket Fence' of seven rawinsonde stations were interspersed among the seven regular rawinsonde sites from Port Hardy, British Columbia to San Diego, CA. All sites obtained observations every 3 hours rather than the normal 12 hours. The objective was to examine the feasibility of utilizing extra observations in time and space to improve upstream boundary conditions for forecasts of mesoscale weather events in the central U.S. Fluxes of mass, heat, momentum, moisture, kinetic energy, and potential energy across the west coast resolved with various spatial and temporal combinations of Picket Fence data were compared with the 12-h regular site sondes as the standard. In the best case in which a wave system creased the middle of the Picket Fence, significantly different fluxes were calculated with the full spatial and 3 h Picket Fence observations. For other systems that crossed near the ends of the axis, only small changes were detected by the additional observations
Winter, Christian [Verfasser], Gerold [Akademischer Betreuer] Wefer, Burghard [Akademischer Betreuer] Flemming und Jan [Akademischer Betreuer] Harff. „Observation- and Modelling of Morphodynamics in Sandy Coastal Environments / Christian Winter. Gutachter: Burghard Flemming ; Jan Harff. Betreuer: Gerold Wefer“. Bremen : Staats- und Universitätsbibliothek Bremen, 2012. http://d-nb.info/1072159392/34.
Der volle Inhalt der QuelleGoyens, Clémence. „Validation et amélioration des méthodes de correction atmosphérique pour les images de la couleur de l'océan dans les eaux côtières optiquement complexes“. Thesis, Littoral, 2013. http://www.theses.fr/2013DUNK0401/document.
Der volle Inhalt der QuelleTo acquire marine parameters from remote sensing ocean color data, the sensor-measured signal needs to be corrected for the atmospheric contribution. Indeed, the solar radiation reflected by air molecules and atmospheric aerosols is significant in the sensor bands of interest for ocean color applications. The removal of the atmospheric contribution is called the atmospheric correction (AC). In open ocean waters, the AC relies on the assumption that the water is totally absorbent in the near infrared (NIR) part of the spectral region, allowing to retrieve the atmospheric contribution and to extrapolate it to the visible spectral range, and thus to determine the marine signal that contains the information on the optical properties of seawaters. However, this assumption is not valid in highly productive and turbid coastal waters. Hence, AC approaches for coastal waters need to rely on alternative assumptions. This Ph. D. thesis has as main objective to validate and improve these AC methods developed for contrasted coastal waters, with a focus on MODIS Aqua images. First, a validation and comparison of existing AC methods, relying on diverse assumptions and methods, is performed. Therefore, four commonly used AC methods are selected, (1) the standard NIR AC approach of NASA, (2) the NIR similarity spectrum AC approach including assumptions of spatial homogeneity in the water and aerosol reflectance, (3) the switching algorithm using the short wave infrared bands for AC in highly turbid waters, (4) an Artificial Neural Network algorithm. With the help of a validation exercise based on in situ data and as a function of the water type, several areas of improvement are delineated, including the use of spectral relationships to constrain NIR-modelling schemes. Modified NIR-modelling schemes are suggested for the standard NASA and NIR similarity spectrum AC methods. Both are forced with globally valid spectral relationships. Sensitivity studies and validation exercises, using MODIS-Aqua images in the Eastern English Channel/North Sea and French Guiana waters, are conducted showing that the suggested modified NIR-modelling schemes improve the estimations of the marine signal in contrasted coastal waters
Roobaert, Alizée. „Observation-based estimates of the global oceanic CO2 sink: Spatiotemporal analysis, quantification of uncertainties, processes description“. Doctoral thesis, Universite Libre de Bruxelles, 2020. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/307139.
Der volle Inhalt der QuelleDepuis le début de la révolution industrielle, une grande quantité de gaz à effet de serre tels que le dioxyde de carbone (CO2) a été émise dans l'atmosphère en raison des activités humaines. L'une des principales conséquences de ces émissions est une augmentation rapide de la concentration en CO2 atmosphérique et une modification profonde du système climatique de la Terre. L'océan joue un rôle important dans l'équilibre radiatif de la Terre car il agit comme un important puits de CO2 pour l'atmosphère. En absorbant actuellement environ 25 % du CO2 émis par l'homme, il ralentit considérablement le changement climatique. Comprendre la dynamique spatiale et temporelle actuelle de l'échange de CO2 air-mer et les différents processus qui régissent cet échange est d'une importance cruciale pour anticiper l'évolution du puits océanique de CO2 à l'avenir.Cette thèse a été réalisée dans ce contexte et s'est concentrée sur une meilleure quantification de l'échange de CO2 à travers l'interface air-mer (FCO2) de l'océan global, considérant à la fois l’océan ouvert et les régions côtières. L'objectif principal était de combler les lacunes dans notre compréhension des processus qui régissent la distribution spatiale et temporelle du FCO2. Cet objectif a été principalement atteint grâce à des approches observationnelles et a abordé trois aspects principaux: une quantification des différentes sources d'incertitudes du FCO2 à l'échelle globale, une analyse de la distribution spatiale de l'échange de CO2 océanique avec un fort accent sur l'océan côtier et une première évaluation de la dynamique saisonnière du FCO2 côtier et de ses moteurs sous-jacents. Ce dernier s'est appuyé sur une approche de fusion de modèles et d’approches observationnelles permettant de décomposer la saisonnalité du FCO2 en ses principaux moteurs physiques et biogéochimiques.La quantification du FCO2 océanique à partir d’observations consiste à calculer un gradient de pression partielle air-mer de CO2 (ΔpCO2) entre l'atmosphère et la surface de la mer. Des produits globaux continus mensuels de la pression partielle de CO2 (pCO2) peuvent par exemple être dérivés à partir de bases de données observationnelles de pCO2 et de méthodes d'interpolation statistique. ΔpCO2 est ensuite multiplié par un coefficient de vitesse de transfert d'échange gazeux (k), qui dépend de la vitesse du vent. Cependant, la paramétrisation de k est sujette à de larges incertitudes et mal quantifiées. À partir d'une synthèse de la littérature de toutes les paramétrisations de k disponibles dans la littérature au cours des 25 dernières années, j'ai d'abord quantifié les incertitudes sur FCO2 associées à k à l'échelle globale et régionale pour l'océan ouvert. J'ai également quantifié les incertitudes associées au choix d'un produit éolien par rapport à un autre. Nos résultats montrent que la gamme du FCO2 global, calculée avec ces différentes paramétrisations de k, diverge de 12 % lors de l'utilisation de CCMP, ERA ou NCEP1. En raison des différences dans les pattern de vent régionaux, les différences régionales sur le FCO2 sont plus prononcés que globalement. Ces différences globales et régionales augmentent de manière significative lors de l'utilisation de NCEP2 ou d'autres formulations de k. Afin de réduire les incertitudes associées au choix du produit de vent, il est possible de recalculer la paramétrisation de k pour un produit de vent donné et à une résolution spatio temporelle.Dans un deuxième temps, nous avons amélioré la quantification et l'analyse des principaux pattern et des différents processus sur la distribution spatiale du FCO2 pour l’ensemble des régions côtières. Cette analyse a été réalisée à l'échelle globale (à une résolution spatiale de 0.25°), en utilisant une segmentation régionale de l'océan côtier, et latitudinalement. J'ai trouvé que les régions côtières aux hautes latitudes agissent comme un puits de CO2 tandis que les régions côtières tropicales et le long de l'équateur ont tendance à agir comme une source de CO2 atmosphérique. Globalement, j'ai quantifié que les régions côtières agissent actuellement en tant que puits de CO2 avec une valeur de -0.20 ± 0.02 Pg C an-1. Pour la première fois, j'ai également comparé la distribution spatiale du FCO2 côtier à celle de l'océan ouvert adjacent, à l'échelle globale. À l'exception de certaines régions telles que celles dominées par les apports fluviaux, j'ai démontré que les régions côtières et l’océan ouvert adjacent présentaient une distribution latitudinale similaire sur leur densité de FCO2 par unité de surface, suggérant des réponses analogues à l'augmentation du CO2 atmosphérique. J'ai également réévalué le budget mondial de CO2 de l'océan et estimé une absorption mondiale de CO2 anthropique comprise entre -2.6 ± 0.4 Pg C an-1 et -2.9 ± 0.5 Pg C an-1 pour la période 1998-2015. Dans un troisième temps, j'ai contribué à la création du premier produit continu de pCO2 observationnelles fusionnant le domaine côtier et l'océan ouvert de manière cohérente. Cette étude a montré que la différence entre les estimations provenant du produit de pCO2 de l’océan ouvert à celles dérivant du produit de pCO2 de l’océan côtier le long de leur zone de chevauchement augmente avec la latitude mais reste proche de 0 µatm globallement. Des divergences plus fortes existent cependant au niveau régional, entraînant des différences qui dépassent 10 % sur la moyenne climatologique de pCO2, en particulier dans les régions contraintes par moins d'observations, associées à une complexité biogéochimique, comme le système d'upwelling péruvien et les régions couvertes de glace.Dans une quatrième étape, une analyse temporelle de la saisonnalité du FCO2 a été réalisée pour l'océan côtier sur la base d'une approche observationnelle. J'ai analysé et quantifié la dynamique saisonnière du FCO2 à l'échelle globale et pour différentes bandes latitudinales. À l'échelle globale, les régions côtières agissent comme un puits de CO2 avec une absorption plus intense se produisant en été (-21 Tg C mois-1) en raison de l'influence disproportionnée des régions côtières des hautes latitudes dans l'hémisphère Nord. J'ai également estimé la contribution de différents processus (couverture de glace de mer, vitesse du vent et changement de ΔpCO2) à l'amplitude saisonnière du FCO2. Cette approche basée sur les données observationnelles m'a permis de conclure que ΔpCO2 est le principal moteur de la variabilité du FCO2 à l'échelle saisonnière. J'ai ensuite utilisé un modèle biogéochimique océanique global pour décomposer davantage la variabilité saisonnière du pCO2 côtier en ses processus physiques et biologiques. À partir d'une première évaluation qualitative, j'ai conclu que l'effet thermique associé aux changements de température de la surface de la mer est le principal effet régissant la variabilité côtière saisonnière du pCO2 sauf aux hautes latitudes où l'effet non thermique associé aux changements de biologie, de circulation, d'eau douce et de l’échange de CO2 air-mer domine. J'ai également constaté que, globalement, l'effet thermique à lui seul devrait entraîner des fluctuations saisonnières plus importantes, mais son influence est en partie compensée par l'effet non thermique.Tout au long de cette thèse, j'ai également évalué dans quelle mesure les produits continus de pCO2 observationnelles dérivés d'une approche de réseau de neurones artificiels et du modèle biogéochimique océanique global MOM6-COBALT pourraient reproduire les champs de pCO2 bruts extraits des bases de données globale. Dans l'ensemble, j'ai montré qu'à l'échelle régionale, les deux produits sont relativement en bon accord par rapport aux observations. J'ai également identifié les régions où les différences sont les plus importantes et où de futures données observationnelles sont nécessaires à l'avenir, ainsi que les régions où les deux produits présentent un accord le plus satisfaisant et, par conséquent, le plus approprié pour de futures analyses de compréhension des différents processus.
Doctorat en Sciences
info:eu-repo/semantics/nonPublished
Abascal, Zorrilla Noélia. „Dynamics of the Amazon mud bank system through spatial observation and hydro-sedimentary modeling : application to he coastal domain of French Guiana“. Thesis, Guyane, 2019. http://www.theses.fr/2019YANE0002.
Der volle Inhalt der QuelleThe coast of French Guiana is characterized by the northwestward migration of large mud banks alongshore and by high concentration of suspended particulate matter (SPM) resulting from the strong influence of the Amazon River outflow. Mud banks govern the regional coastal morphology. A better understanding of its extension and dynamics is crucial for the coastal ecosystems management and activities at a regional scale. Several studies have been performed over French Guiana coastal area providing descriptive information about mud-bank morphology and migration speed. However, most studies have centred on the description of intertidal areas, whereas only few have focused on the subtidal zone, the biggest part of mud banks. The overarching aim of this thesis it to adapt two different approaches, such as high resolution remote sensing data and numerical models developed based on in-situ local measurements, to gather better insights into the subtidal part morphology and the influence of external forcings on its dynamics. The latter approaches are complementary and formed an interlinked feedback system that allowed the construction of a hydro-sedimentary model regionally adapted.Optimal exploitation of the information provided by recent high spatial resolution sensors such as Landsat 8-OLI is strongly conditioned by the quality of the water reflectance signal retrieval. This implies specific methodological development. One main issue in French Guiana stands in the ability to correct marine reflectance data for sun glint contamination. Thus, an automated SWIR based method has been developed using a 4-year OLI archive gathered over the very turbid waters of French Guiana. Satisfying results based on in-situ Rrs measurements in sun glint affected areas emphasize the relevant performance of the proposed methodology. Sun glint correction allowed the recovery of the marine reflectance signal and the estimation of surface OLI SPM concentration. A method to estimate the location of mud banks footprint has been developed based on SPM recurring values. A good performance was observed when the results were compared to those obtained by locating the limit of wave damping over the fluid mud of the subtidal part of mud banks. Mud-bank migration rates in French Guiana were calculated according to the delimitation of the subtidal part, and showed slightly higher values (2.31 km/year) than suggested by earlier studies. After obtaining remote sensing data and in-situ measurements, a 2D locally adapted hydro-sedimentary model was constructed based on the information provided by the latter approaches. The model takes into account the combined action of tide, currents, river discharge, wind and waves. Besides, the model also considered hydro-sedimentary processes related to cohesive sediments. Its development has followed three different steps: i) development of the hydrodynamic model; ii) development of the hydro-sedimentary model without considering wave-mud interaction; iii) and incorporation of waves to the hydro-sedimentary model, and has been validated via in-situ measurements and remote sensing data. The influence of the external forcings has been analysed for the dry and the rainy season. Despite the assumptions of the model, it reproduces qualitatively SPM trends and patterns on the subtidal part of the mud bank and the orders of magnitude are comparable to those provided by field and remote sensing data. This PhD provides evidences of the interest of these approaches and the combination of them to obtain better results in such complicated study area. The results obtained may help to further advance the state of knowledge on mud-bank processes and its migration
Piton, Violaine. „Du Fleuve Rouge au golfe du Tonkin : dynamique et transport sédimentaire le long du continuum estuaire-zone côtière“. Thesis, Toulouse 3, 2019. http://www.theses.fr/2019TOU30235.
Der volle Inhalt der QuelleDeltas and coastal regions deliver the largest inputs of freshwater and sediments to the shelf and open ocean, understanding water and sediment dynamics and variability in those regions is therefore crucial. The spatio-temporal variability of estuarine and ocean dynamics under the influence of natural forcings and their impact on sediment transport and fate was assessed along the Red River estuary - coastal ocean - Gulf of Tonkin continuum. First, in-situ estuarine observations evidenced the seasonal and tidal variabilities of flow and suspended matter, and showed in particular the role of tidal pumping in the estuary siltation. Second, a 3D realistic hydrodynamic model was set up and calibrated with various observations and satellite data. Beforehand, a high-resolution model configuration was implemented and optimized with sensitivity tests of the Gulf of Tonkin's tidal components to bathymetry and various bottom friction parameterizations. Third, the resulting optimized configuration was used to study the large scale Gulf of Tonkin circulation at daily, seasonal and interannual scales, and to identify the drivers of their variabilities. Ekman transport variability due to monsoon winds reversal drives the seasonal circulation, which can be reversed in summer by episodic typhoon events and intensified in winter. ENSO, strong typhoon activity and Arctic Oscillation have been identified as drivers of the interannual circulation variability. Lastly, preliminary tests with a sediment transport module coupled with the hydrodynamics model revealed the importance of the seabed composition and of the parameterization of the erosion coefficients
Rahn, David. „Forcing and structure of the 22-25 June 2006 coastally trapped wind reversal using aircraft observations and numerical simulations“. Laramie, Wyo. : University of Wyoming, 2008. http://proquest.umi.com/pqdweb?did=1799961831&sid=1&Fmt=2&clientId=18949&RQT=309&VName=PQD.
Der volle Inhalt der QuelleEvans, Ben Richard. „Data-driven prediction of saltmarsh morphodynamics“. Thesis, University of Cambridge, 2018. https://www.repository.cam.ac.uk/handle/1810/276823.
Der volle Inhalt der QuelleDoliber, Sarah Rebecca. „Groundwater Surface Trends in the North Florence Dunal Aquifer, Oregon Coast, USA“. PDXScholar, 2012. https://pdxscholar.library.pdx.edu/open_access_etds/530.
Der volle Inhalt der QuelleJoshua, Quinton Ignatius. „Seasonal effects on the feeding ecology and habitat of Chersina Angulata in the South Western Cape“. Thesis, University of the Western Cape, 2008. http://etd.uwc.ac.za/index.php?module=etd&action=viewtitle&id=gen8Srv25Nme4_4554_1370947091.
Der volle Inhalt der QuelleNearly one-third of the world&rsquo
s tortoises live in South Africa, but little is known about their habitat requirements and feeding ecology. Chersina angulata, the angulate tortoise, is endemic to 
southern Africa, with a wide distribution along the western and southern coasts. Because this tortoise occupies a number of different habitat types, it has always been considered a generalist 
herbivore, although little is known about its 
diet and other needs. This study evaluates the habitat characteristics and feeding ecology of C. angulata at two study sites in the southwestern 
 
 
Cape, the West Coast National Park (WCNP) and Dassen Island (DI). The WCNP is a large conserved area in the Fynbos biome, along the southwestern coast of South Africa, whereas DI is a 
small offshore island with low floral and faunal diversity, just south of the WCNP. The efficacy of three methods used to study the feeding ecology of herbivores, focal observations, macroscopic faecal analysis and histological analysis of scats, was evaluated. Plant cover, species diversity, and the variety of growth forms were substantially larger at the WCNP than on DI. 
In the WCNP, shrubs and grasses were the dominant growth forms but the vegetation also included herbs, succulents, restios, sedges and parasitic plants. A few perennial species such as 
the grass Ehrharta villosa, shrubs such as Helichrysum niveum, Nylandtia spinosa and Rhus spp., and succulents such as Carpobrotus edulis and Ruschia spp., provided most of the plant 
cover. DI had a depauperate flora, consisting of succulents and herbs, and ephemeral plants contributed more than perennials did to plant cover throughout the year. The succulents Mesembryanthemum crystallinum and Tetragonia fruticosa provided most of the cover on DI. Angulate tortoises are herbivores and 72 diet plants in 32 plant families were identified to the 
species or genus level. Several diet species, however, could not be identified. In 
addition to angiosperms, the tortoises&rsquo
diet included mosses, mushrooms, insects,snails and animal faeces. 
The most important growth forms in the diet were herbs and grasses. The diet of the WCNP tortoises was more diverse than the diet of DI tortoises, but the number of principal food items in 
the diet did not differ between the two sites. Over an annual cycle, WCNP tortoises had four principal food plants while DI tortoises had five principal food plants. At both sites, principal food 
 
plants changed with the season and few plants remained principal food items in more than one season. Cynodon dactylon was a principal food item in three of the four seasons in the WCNP, whereas Trachyandra divaricata was a principal food plant each season on DI. Most principal food plants were grass or herb species but the sedge Ficinia nigrescens, and a succulent that 
could be identified only to the family level (Aizoaceae), featured strongly in the spring diets of DI and WCNP tortoises, respectively. 
The three study methods did not provide the same type or quality of information about the feeding ecology of angulate tortoises. The small size and wary nature of angulate tortoises compromised focal studies because it was often not possible to see 
what the tortoises ate. This method, however, provided the interesting observation that rabbit 
faecal pellets contributed nearly 30% to summer and autumn diets on DI when food was scarce. 
Rabbit faeces may not only provide a source of nutrients but may also supplement the microflora, required to digest cellulose, in the tortoises&rsquo
guts. Macroscopic evaluation of the tortoises&rsquo
 
scats appeared to be an ineffective method to identify diet plants, and the bulk of the scat mass could not be identified. This indicates 
that angulate tortoises either selected food low in fibrous 
content or that the digestive system of the tortoises dealt efficiently with tough plant material. The macroscopic method was the only method that highlighted the large contribution of 
fruits / seeds to the diet of angulate tortoises. Since the tortoises digested many seeds only partially, or not at all, C. angulata is potentially an important agent of seed dispersal in the southwestern Cape. The macroscopic study showed that on DI, sand made up 28% of the scat mass in spring, whereas sand never made a substantial contribution to the scat composition of WCNP tortoises. Lithophagy may be an important strategy in a depauperate habitat, such as DI, because the abrasive action of sand may help with the digestion of tough plants, or the sand may 
provide the tortoises with important minerals that are deficient in their food plants.The histological analysis of scats provided the most comprehensive diet list for C. angulata. Selection indices 
based on data from the histological analysis indicated that angulate tortoises were highly selective in their food choice. Most of the principal food items were selected out of proportion to their 
availability and the tortoises avoided the most abundant plants in their habitats. Several factors, such as palatability, accessibility and profitability, may have influenced their food choice. The proportional similarity indices for WCNP and DI tortoises, respectively, were 0.31 and 0.16, confirming that C. angulata is a food specialist and not a food generalist as was previously thought. This factor should be considered in the management of this species and in future conservation planning of its habitat. 
 
Karabil, Sitar. „Determination Of Sea Level Trends And Vertical Land Motions From Satellite Altimetry And Tide Gauge Observations At The Mediterranean Coast Of Turkey“. Master's thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12613971/index.pdf.
Der volle Inhalt der QuelleBarendse, Jaco. „Local movements, migrations and habitat use of humpback whales off the west coast of South Africa, including observations of southern right whales“. Thesis, University of Pretoria, 2012. http://hdl.handle.net/2263/30845.
Der volle Inhalt der QuelleThesis (PhD)--University of Pretoria, 2012.
Zoology and Entomology
PhD
Unrestricted
Vorsatz, Lyle Dennis. „Observations on the biology and seasonal variation in feeding of the East Coast redeye round herring (Etrumeus wongratanai) (Clupeiformes), off Scottburgh, KwaZulu-Natal, South Africa“. University of the Western Cape, 2016. http://hdl.handle.net/11394/5545.
Der volle Inhalt der QuelleThe basic biology and ecology of Etrumeus wongratanai was investigated from samples of fish collected by jigging off Scottburgh, Kwazulu-Natal throughout 2014 and 2015. A total of 516 otoliths, 401 gonads, 140 stomachs and 163 samples of white muscle tissue was examined, and length and weight data of 3 637 fish caught between 2013 and 2016 was also analysed. Counts of annuli deposited on sagittal otoliths indicate that sampled E. wongratanai ranged from 0 to 3 y. (year/s) of age. Length-at-age for males (females) was estimated at 15.5 cm (16.2 cm) for 1 y. olds, 17.7 cm (17.4 cm) for 2 y. olds and 19.6 cm (18.8 cm) for 3 y. olds. The length at 50% maturity was estimated to be 15.6 cm for males, and 16.1 cm for females. Etrumeus wongratanai showed high gonadosomatic index values from June to December indicating that the breeding season lasts for 6 and 8 months for males and females, respectively, and that spawning takes place from the onset of winter to early summer. Condition factor was lowest in May through to August and increased from September. The low condition factor values from May through to August could be due to the physiological strain before and during the spawning season. Fish larvae were the most important food item in samples collected in summer, whereas eucalanids were the most important prey item in autumn and winter. Overall, large copepods were the dominant prey items in terms of frequency and importance. Stable isotope data suggests that there are gradual changes in the trophic level and diet of E. wongratanai as it increases with size, and whilst δ¹⁵N values differed between seasons δ¹³C did not. The results obtained here are compared with other species of Etrumeus, regionally and globally.
National Research Foundation (NRF) and ACEP Phulisa
Wei, Wei. „Characteristics of the late Mesozoic tectonic evolution of the South China block and geodynamic implications : Multi-approach study on the Qingyang-Jiuhua, Hengshan and Fujian coastal granitic massifs“. Phd thesis, Université d'Orléans, 2013. http://tel.archives-ouvertes.fr/tel-01058791.
Der volle Inhalt der QuelleLu, Yun-Wen, und 盧韻雯. „Observations of coastal changes in Guo-sheng Bay, north Taiwan“. Thesis, 2010. http://ndltd.ncl.edu.tw/handle/37796482170790046708.
Der volle Inhalt der Quelle國立臺灣海洋大學
應用地球科學研究所
98
In the north Taiwan, the pocket–like Guo-sheng Bay is located between Jin-shan and Ye-liu caps with its opening towards northeast. Inside the bay at Wan-li country, the nuclear energy plant No.2 was built by Taipower Company and its 200-meter-long water outlet blocked the originally continuous coastline. The purpose of this study is to study whether the nearby sandy coast will be affected by the artificial construction. This study purchased the aviation digital photos from Aerial Survey Office, Forestry Bureau from 1979 to 2007. After ortho-rectification of the digital photo data, the sequential coastlines were extracted with the Geographical Information System. Afterwards, the extracted six years’ coastlines were overlaid one another to study the artificial effects. Meanwhile, by integrating the wave incidence direction, we found there is a obvious northwest longshore current in the north of study area and a slight southeast longshore current in the south of study area. Based on the results of the study, I found that the shore area changes with different seasons. For Example, the beach surface is wide and steep in winter time and narrow and smooth in summer time without typhoon influence. By the grain-size and mineral composition analyses of sediments, the sediments of this area are mainly derived from the source area through the Yuan-ten River. To sum up the results of the study, the coastline has slightly and repeatedly shifted back and forth during the last three decades. Therefore, the coastline is in a stable status and not affected by the water outlet of nuclear power plant no.2. The seasonal change of the shoreline is affected mainly by the monsoon and the occasional typhoon event.
Yang, Kun-ting, und 楊昆庭. „Land subsidence of coastal area of western Taiwan from leveling observations“. Thesis, 2007. http://ndltd.ncl.edu.tw/handle/42967244750565587329.
Der volle Inhalt der Quelle國立成功大學
地球科學系專班
95
There are several factors causing land subsidence, including the uneven distribution of water pumping. The rapid development of aquaculture industry in the coastal areas of Taiwan has also resulted in ground subsidence due to over pumping of ground-water. Precise leveling is a traditional technique of height difference measurement. The way of precise leveling is taking by each station forwards step by step, the adjustment result of leveling network is then corrected by reducing the systematic error of observations. The major themes of this research are analyzing the 2003-2006 leveling observations in the western coastal area. Results indicate 1-6 cm subsidence every year, and land subsidence has become a serious problem in the Yun-Lin and Chia-yi areas. Some areas in Yun-Lin and Chia-yi will below the sea level after 30-40 year.
Bastos, de Oliveira H. „Upwelling dynamics in Southern Australia : numerical modelling and observations“. Thesis, 2018. https://eprints.utas.edu.au/28682/1/Bastos_de_Oliveira_whole%20_thesis.pdf.
Der volle Inhalt der QuelleTaylor, Shawn D. „Addressing observations bias within a GPS-telemetry study of coastal mountain goats“. Thesis, 2002. http://hdl.handle.net/2429/13253.
Der volle Inhalt der QuelleLin, I.-Yuan, und 林益源. „The current variation at Tanshui river mouth:cross river and coastal remote observations“. Thesis, 2006. http://ndltd.ncl.edu.tw/handle/40602630121617473389.
Der volle Inhalt der Quelle國立臺灣海洋大學
海洋環境資訊學系
94
Tanshui River mouth is important for coastal defense purpose in north of Taiwan. The sea condition over there is of high concern to the ROC Coast Guard. The in situ observation in real time at sea is not quite straightforward, encouraging the application of coastal radar remote sens-ing for currents and waves. However, its results ought to be examined by various surveys at sea, providing an opportunity to study the interaction of current field and hydrographic field. The coastal remote sensing is done by the Wavex radar system. The surface currents are tracked by GPS drifters, while the subsurface currents below 2.5 m depth are scanned by the Acoustic Doppler Current Profiler (ADP). The time series of hydro-graphic variation are derived by CTD casts. A temperature and pressure recorder (TD) is used to get tide and waves information. The results show that, due to the coastal southwest flood current, the surface currents at the river mouth rotate counterclockwise and reduce speeds gradually to enter the river channel with a cyclonic moving track. On June 13 of 2006, the temperature of river water was lower than that of sea water outside the river mouth, constructing the vertical hydrographic structure with surface water of low temperature and low salinity. The temperature difference between surface and bottom waters reaches 3℃ and 10 ppt for salinity. At high tide, such stratification disappears with a similar temperature and salinity all over the water column. In ebb tide, sea water entered during flood tide and river water discharge together to strengthen the westward flow up to a speed of 4 knots. The hydrographic stratification appears again. Af-fected by the coastal northeast ebb current, the strengthening outflow of the river rotates counterclockwise continuously, but with an anti-cyclonic moving track instead. The 2.5 m subsurface current scanned crossing the river mouth indicate that the northern half of the mouth is the main drain-age of the river and the current is about the same as of the surface. The results of coastal radar measurement are not quite comparable, requiring further investigation.
O'Hara, John F. „A comparison of satellite-derived ocean velocities with observations in the California coastal region“. Thesis, 1987. http://hdl.handle.net/10945/22677.
Der volle Inhalt der QuellePatricio, Valerio Larissa. „Exploring Himawari-8 geostationary observations for the advanced coastal monitoring of the Great Barrier Reef“. Thesis, 2021. https://researchonline.jcu.edu.au/71374/1/JCU_71374_Patricio-Valerio_2021_thesis.pdf.
Der volle Inhalt der QuelleDi, Iorio Daniela. „Measurements of turbulence paramaters and observations of multipath arrivals in two contrasting coastal environments using acoustical scintillation analysis“. Thesis, 1994. http://hdl.handle.net/1828/5745.
Der volle Inhalt der Quelle