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1
Courtis, Benjamin John. „Water quality chlorine management“. Thesis, University of Birmingham, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.289743.
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2
Marchiori, Giovanni <1991>. „Water Quality Management in China“. Master's Degree Thesis, Università Ca' Foscari Venezia, 2018. http://hdl.handle.net/10579/13022.
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The aim of this thesis is to provide a comprehensive view of surface water and groundwater quality management as in these recent years it has been a widely discussed topic of international relevance, with a particular focus on China's legislative and regulatory developments that had an impact on water quality related issues.
3
Seager, John. „Environmental standards for water quality management“. Thesis, University of East Anglia, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.302181.
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4
Babu, Abisekaraj Sharon. „Knutsford redevelopment: Water quality and management“. Thesis, Babu Abisekaraj, Sharon (2019) Knutsford redevelopment: Water quality and management. Honours thesis, Murdoch University, 2019. https://researchrepository.murdoch.edu.au/id/eprint/54833/.
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Knutsford redevelopment is part of the Local Government’s agenda to incorporate sustainable living into the residential sector at affordable prices. This development follows on from the newly established White Gum Valley (WGV) and currently constructing East Village. Both of the sites have newly developed technology to demonstrates sustainable living in a density wise design. East Village is being developed to show similar results with more sustainable and saving initiatives such as the use of solar energy, rainwater harvesting on a lot scale, and a community battery to provide for the residents. Knutsford is stage 4 of the development plan that is occurring in Fremantle. This site will follow along the footsteps of previous establishments with improvements to show better results. In order to achieve this, the site needs to meet specific criteria that allow the usage of the natural resources, and if those are not met, the savings initiatives will need to be reconsidered to the basic options that are used by the homes around Perth.
Perth is one of the top cities per capita that has the highest usage and consumption of water in Australia with 123000 L/person (Water Corporation 2019). The Water Corporation is currently working on ways to reduce water usage by 15% before 2030 in order to ensure we have a healthy supply of water for future generations. The Water Balance Model that will be developed for the site at Knutsford needs to show and demonstrate that the reduction in consumption can occur not just in a household scale but a community-wide scale in Perth and that it is readily achievable when specific steps are taken into consideration.
5
Tukker, Mary Jean. „Water quality information system for integrated water resource management“. Thesis, Stellenbosch : Stellenbosch University, 2000. http://hdl.handle.net/10019.1/52054.
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Thesis (MEng)--University of Stellenbosch, 2000.ENGLISH ABSTRACT: The processes of monitoring, modelling and managing the water quality of a catchmerit system including all its unique complexities and interrelationships requires an innovative tool or set of tools to help water managers with their decision making. Numerous methods and tools have been developed to analyse and model the real world. However, many of these tools require a fair degree of technical expertise and training to operate correctly and their output may have to be translated or converted to meaningful information for decision-making using a further set of analytical and graphical display tools. A more appropriate technique for management would be to combine all these functions into a single system. The objective of this research was to develop one such tool, an integrated water quality information system (WQIS). A review of the literature revealed that there has been extensive research and development of tools for the management of individual aspects of water resource distribution, augmentation and quality. However, these tools have rarely been integrated into a comprehensive information system offering decision support to a wide variety of river users and managers. Many of the literature sources also noted that a process of interactive development and integration (i.e. including the intended users in the decision of which components to include, the interface design and the graphical display and output) was vital to ensuring the information system becomes an integral part of the users routine work and decision-making. The WQIS was developed using the recommendations from numerous knowledgeable persons in response to questionnaires, interviews and a prototype demonstration. It includes the results of hydrodynamic river and reservoir simulations and the ability to perform operational river scenario testing. However, the development process is continual and always evolving based on the current or local requirements of water managers. These further developments and research needs are discussed in more detail in the conclusion.
AFRIKAANSE OPSOMMING: Die proses om die waterkwaliteit van 'n opvanggebied, met al die unieke kompleksiteite en onderlinge verhoudings van so 'n stelsel te monitor, modelleer en bestuur, vereis 'n innoverende instrument om waterbestuurders te ondersteun in hul besluitnemings. Talle instrumente en metodes vir die ontleding en modellering van die werklikheid is reeds ontwikkel. Die gebruik van hierdie instrumente vereis gewoonlik 'n redelike mate van tegniese kundigheid en opleiding. Dit mag verder nodig wees om die uitvoer van sulke instrumente te vertaal en/of om te skakel na betekenisvolle inligting vir besluitneming deur die gebruik van bykomende analitiese en grafiese vertoon instrumente. 'n Meer toepaslike bestuurstegniek sou wees om al die funksies in 'n enkele stelsel te kombineer. Die doel van hierdie navorsing was om een so 'n instrument, naamlik 'n geïntegreerde waterkwaliteit inligtingstelsel (WQIS), te ontwikkel. 'n Hersiening van bestaande literatuur het getoon dat daar omvattende navorsing en ontwikkeling van instrumente gedoen is vir die bestuur van individuele aspekte van waterbronverspreiding, waterbronaanvulling en waterkwaliteit. Integrasie van hierdie instrumente, in 'n uitgebreide stelsel wat besluitnemingsondersteuning aan 'n verskeidenheid riviergebruikers en bestuurders bied, kom egter selde voor. Verskeie literatuurbronne het ook aangedui dat 'n proses van interaktiewe ontwikkeling en integrasie (m.a.w. in agname van die voorgenome gebruikers se behoeftes in die kense van komponente, die gebruiker raakvlak ontwerp en grafiese vertoon instrumente en uitvoer) noodsaaklik is om te verseker dat die inigtingstelsel 'n integrale deel word van die gebruiker se daaglikse roetine en besluitnemingsproses. Die WQIS is ontwikkel deur gebruikmaking van die insette en aanbevelings van verskeie kenners in reaksie op vraelyste, onderhoude en 'n demonstrasie van 'n prototype. Dit sluit in die resultate van hidro-dinamiese rivier en dam simulasies en die vermoë om operasionele rivier scenario ontledings uit te voer. Die ontwikkeling is egter 'n deurlopende proses, gebaseer op huidige of plaaslike behoeftes van waterbestuurders. Hierdie verdere ontwikkelings- en navorsingsbehoeftes word meer breedvoerig in die gevolgtrekkings bespreek.
6
Tilley, Aleceia Marie. „Comparison study of the states of Washington and Oregon's total maximum daily load (TMDL) process“. Online pdf file accessible through the World Wide Web, 2007. http://archives.evergreen.edu/masterstheses/Accession86-10MES/Tilley_A%20MESThesis%202007.pdf.
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7
Hamza, Sarah. „State of water quality management in Egypt“. Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0008/MQ42329.pdf.
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Leung, Wai-shun Wilson. „Ecological water quality indices in environmental management /“. View the Table of Contents & Abstract, 2006. http://sunzi.lib.hku.hk/hkuto/record/B3712058X.
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9
Leung, Wai-shun Wilson, und 梁威信. „Ecological water quality indices in environmental management“. Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2006. http://hub.hku.hk/bib/B45013482.
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10
Shen, Zi-soen Belwin. „Transboundary water pollution and its implications for planning and environmental management : Shenzhen-Hong Kong border region as a case study /“. Hong Kong : University of Hong Kong, 1999. http://sunzi.lib.hku.hk/hkuto/record.jsp?B21041775.
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11
Cheung, Sheung-ching. „Transboundary water pollution between Hong Kong and the Pearl River Delta Region : Dongjiang River as a case study /“. Hong Kong : University of Hong Kong, 2002. http://sunzi.lib.hku.hk/hkuto/record.jsp?B25247645.
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12
Coltman, Kenna Maria. „Water table management effects on water quality: a soil column study“. The Ohio State University, 1992. http://rave.ohiolink.edu/etdc/view?acc_num=osu1195165287.
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13
Coltman, Kenna Marie. „Water table management effects on water quality : a soil column study /“. Connect to resource, 1992. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1195165287.
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14
Kwong, Pui-ki. „Surface water quality indicators in China and their implications for sustainability“. Click to view the E-thesis via HKUTO, 2006. http://sunzi.lib.hku.hk/hkuto/record/B36618718.
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15
Steele, Kelsi Lynne. „Atrazine best management practices : impact on water quality“. Thesis, Manhattan, Kan. : Kansas State University, 2008. http://hdl.handle.net/2097/660.
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16
Lessard, Paul. „Operational water quality management : control of stormwater discharges“. Thesis, Imperial College London, 1989. http://hdl.handle.net/10044/1/47538.
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17
Cheng, Man-shun. „A review of river water quality in Hong Kong /“. Hong Kong : University of Hong Kong, 1998. http://sunzi.lib.hku.hk/hkuto/record.jsp?B20042176.
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18
Martinez, Vila, und Martin Alvaro. „Integrated water resources management: restoration of water quality in water resources from developing countries“. Thesis, Сумський державний університет, 2013. http://essuir.sumdu.edu.ua/handle/123456789/31626.
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Water is most essential but scarce resource in developing countries. Presently the quality & the availability of the fresh water resources is the most pressing of the many environmental challenges on the national horizon. The stress on water resources is from multiple sources and the impacts can take diverse forms. Geometric increase in population coupled with rapid urbanization, industrialization and agricultural development has resulted in high impact on quality and quantity of water in developing countries. The situation warrants immediate redressal through radically improved water resource and water quality management strategies.
When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/31626
19
Didan, Kamel. „Prototype geographic information system for agricultural water quality management“. Diss., The University of Arizona, 1999. http://ezproxy.library.arizona.edu/login?url=.
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20
Penn, Jerrod M. „VALUATION OF RECREATIONAL BEACH QUALITY AND WATER QUALITY MANAGEMENT STRATEGIES IN OAHU“. UKnowledge, 2013. http://uknowledge.uky.edu/agecon_etds/19.
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Hawaii’s pristine ocean and tropical environment is a keystone of Hawaii tourism and the state economy. Water pollution from stormwater and development threatens the beach quality to both residents and tourists. In order to understand the lost nonmarket value, we assess changes in quality of beach characteristics including water and sand quality, swimming safety conditions, and congestion using a Discrete Choice Experiment of recreational beach users. Further, we study willingness to pay (WTP) for water management strategies in Hawaii using another discrete choice experiment, including structural and nonstructural Best Management Practices, testing, monitoring, and educational efforts.
Using a mixed logit model, beach quality results suggest similar preferences among resident and tourists. Both groups consistently have higher WTP to avoid poor quality levels versus obtaining excellent levels. Additionally, water quality is the single most important attribute. For the policy discrete choice experiment, both parties exhibit similar ranking of WTP to initiate water quality management strategies, with improved testing methods followed by education having the highest WTP. Lastly, we use Benefit-Cost analysis to find that all significant management strategies may be viable, since WTP is greater than the predicted cost of implementation based on expert opinion of Hawaiian policy leaders.
21
Goodhue, Nigel David. „Hydrodynamic and water quality modelling of the lower Kaituna River and Maketu Estuary /“. The University of Waikato, 2007. http://hdl.handle.net/10289/2375.
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The Maketu Estuary is a shallow intertidal estuary (2.3 km2) located in the Bay of Plenty, North Island, New Zealand. The Kaituna River contributes the largest freshwater flow into the estuary through control gates. Lake Rotoiti and indirectly Lake Rotorua supply the base flow to the Kaituna River, with tributaries along the 50 km reach also significantly contributing to the flow. Water quality within the river is affected by elevated nutrients, faecal coliforms, high oxygen demand and algae concentrations derived from the lakes as well as contributions from tributaries and industrial and urban discharge. Through the use of a coupled hydrodynamic-biogeochemical numerical model ELCOM-CAEDYM, this study aims to examine the nutrient, phytoplankton and hydrodynamics of the Maketu Estuary and lower Kaituna River. Water quality and hydrodynamic measurements were sourced from Environment Bay of Plenty's data archives as well as a number of instrument deployments to collect water velocity, tidal elevation and salinity and temperature measurements during the course of this study. Included in the field work was a survey of the lower river and estuary bathymetry. Model simulations predicted that the maximum residence time in the Maketu Estuary is 1.5 days, occurring in the inner western region. Residence time in the lower river (mouth to 8.5 km upstream) is in the order of hours although some variations were predicted near the river mouth. Growth rates of four phytoplankton groups where assessed over a 15 day period in January 2004. In the Kaituna River ELCOM-CAEDYM predicted that the community growth rates were small with the exception of a slight increase in biomass of the two freshwater groups in a semi-detached river bend. The increase in the loop was correlated with an increase of residence time. In the estuary, marine diatoms showed the highest growth rates in the western region which is expected to relate to retention time and available nutrients. Dinoflagellates showed the smallest variation in predicted growth rates, most likely due to their broad salinity tolerance. The two freshwater species showed a reduction in abundance when mixed with marine water. A principle limiting factor to phytoplankton growth in both the river and estuary is the low residence time. A number of scenarios were simulated in the river and estuary by altering the forcing conditions in the model. A simulation of the increased nutrient load associated with the Rotoiti diversion wall revealed that phytoplankton growth in the river and estuary will not be significantly affected. Because of the close proximity of the control gates to the river mouth, a proportion of water drawn through the structure can be marine. By opening the old river channel, model simulations predicted that a reduction in salinity would be possible, however the outcome of complete freshwater is probably not achievable. Increasing the discharge volume from the river into the estuary was also simulated. The results indicated that increasing the freshwater inflow at Fords Cut would reduce the salinity in the estuary while increasing the net (residual) flow towards the estuary mouth. Increasing the flow would also result in a greater range of salinity in regions of the estuary. Changing the inflow location to the historic Papahikahawai Channel also affected the salinity in the estuary. The most significant effect of an inflow at this location was a reduction of the residual currents in the western region of the estuary.
22
Pong, Chung-nam. „Water quality of reservoirs in Hong Kong /“. View the Table of Contents & Abstract, 2007. http://sunzi.lib.hku.hk/hkuto/record/B39604238.
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23
Ellison, Christopher A. „Water quality of the Muddy Creek basin“. Laramie, Wyo. : University of Wyoming, 2008. http://proquest.umi.com/pqdweb?did=1594477291&sid=1&Fmt=2&clientId=18949&RQT=309&VName=PQD.
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Higgins, Jennifer. „Management of Recycled Water Quality in the Urban Environment“. Thesis, Griffith University, 2010. http://hdl.handle.net/10072/367756.
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A rapid expansion in use of recycled water in urban Australia has occurred over the last decade, prompted mainly by a reduction in water supplies due to drought, increasing awareness of the impact of climate change on water resources and changes in government water recycling policies. This expansion has resulted in a 117% increase Australia wide in the reuse of effluent from wastewater treatment plants by major water authorities. This study describes the developments in recycled water quality, from 1999 to 2009, during its progress from ‘treated effluent’, to ‘reclaimed water’, to ‘recycled water’ and then to ‘purified recycled water’. The developments studied include changes in people’s concerns about recycled water quality, changes in the benchmarks of water quality, as described in water recycling guidelines and effluent discharge licences, and changes in recycled water quality during storage in open ponds. This study also describes preliminary investigations into a novel approach, of applying a microbial source tracking technique, to follow changes in water quality during conventional wastewater treatment processes and storage in open ponds.
Concerns about recycled water quality were examined by distributing a questionnaire in mid-2000 to providers and users of recycled water in Queensland. Four out of five respondents had concerns about aspects of recycled water quality including microbiological components (viruses, parasites and bacteria), salinity related components, aggregate components (pH and solids), nutrients and organic components (pesticides and endocrine disruptors). One in four respondents expressed concern about quality variability, particularly those from low population density areas. One in five users had observed quality changes during distribution to the point-of-use including nutrients, chlorine, suspended solids, colour and odour. Half of the providers and one in five users in 2000 proposed to expand their usage of recycled water in the near future and one third of the non-user respondents proposed to commence using recycled water in the following 5 years.
Guidelines for the use of recycled water were reviewed in 2003 and, at that time, the national, State and Territory guidelines contained similar recommendations, for hazard identification and risk assessment, using controls implemented through treatment and management practices. However, despite the framework provided by the national
guidelines, the State and Territory guidelines differed from them concerning sources of recycled water, reuse options, nominated quality criteria, monitoring frequencies, sampling and testing methods and accreditation. Legislation for effluent from wastewater treatment plants discharged to the environment varied between States and Territories and, in most cases, the licences were site specific. The general differences in discharge licences and reuse guidelines included the location of monitoring sites, nominated water quality criteria and compliance levels.
At the completion of this review, the authors proposed that establishment of recycled water schemes could be enhanced by standardisation of the water quality monitoring requirements for effluent discharge, particularly for indicator organisms, with those for effluent reuse through collaboration between licensing and guideline authorities. It was also proposed that a single point of contact for recycling scheme approval be established, in each State or Territory, and that the national guidelines for reclaimed water be better integrated with those for fresh and marine water. Developments in the years since the survey and review were undertaken have been summarised, including the usage, acceptance and quality of recycled water and the latest changes in recycled water guidelines.Thesis (PhD Doctorate)
Doctor of Philosophy (PhD)
School of Environment
Science, Environment, Engineering and Technology
Full Text
25
Telci, Ilker Tonguc. „Optimal water quality management in surface water systems and energy recovery in water distribution networks“. Diss., Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/45861.
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Two of the most important environmental challenges in the 21st century are to protect the quality of fresh water resources and to utilize renewable energy sources to lower greenhouse gas emissions. This study contributes to the solution of the first challenge by providing methodologies for optimal design of real-time water quality monitoring systems and interpretation of data supplied by the monitoring system to identify potential pollution sources in river networks. In this study, the optimal river water quality monitoring network design aspect of the overall monitoring program is addressed by a novel methodology for the analysis of this problem. In this analysis, the locations of sampling sites are determined such that the contaminant detection time is minimized for the river network while achieving maximum reliability for the monitoring system performance. The data collected from these monitoring stations can be used to identify contamination source locations. This study suggests a methodology that utilizes a classification routine which associates the observations on a contaminant spill with one or more of the candidate spill locations in the river network. This approach consists of a training step followed by a sequential elimination of the candidate spill locations which lead to the identification of potential spill locations. In order to contribute the solution of the second environmental challenge, this study suggests utilizing available excess energy in water distribution systems by providing a methodology for optimal design of energy recovery systems. The energy recovery in water distribution systems is possible by using micro hydroelectric turbines to harvest available excess energy inevitably produced to satisfy consumer demands and to maintain adequate pressures. In this study, an optimization approach for the design of energy recovery systems in water distribution networks is proposed. This methodology is based on finding the best locations for micro hydroelectric plants in the network to recover the excess energy. Due to the unsteady nature of flow in water distribution networks, the proposed methodology also determines optimum operation schedules for the micro turbines.
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Andrish, Sean David, und Sean David Andrish. „Water quality management in the Quinnipiac River Basin, Connecticut“. Thesis, The University of Arizona, 1997. http://hdl.handle.net/10150/626903.
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The Quinnipiac River Basin, located in South-Central Connecticut, flows 38 miles
from its headwaters in New Britain and Plainville, Connecticut to its mouth in New
Haven Harbor. The basin is heavily developed, with the majority of the land in the basin
classified as residential and urban. The five municipal water pollution control facilities
and one large privately-owned water pollution control facility operating in the Quinnipiac
Basin are responsible for maintaining acceptable levels of water quality in the
Quinnipiac River.
While the current water quality management practices within the Quinnipiac
River basin are capable of meeting the various water quality standards, changes in the
water quality management system may require an adjustment or alteration of the current
management practices. The focus of this study is the identification of possible
improvements to the current water resources management practices in the Quinnipiac
Basin and a discussion of the feasibility of the proposed improvements.
27
Maeda, Shigeya. „Optimization of wasteload allocation for river water quality management“. Kyoto University, 2002. http://hdl.handle.net/2433/78139.
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Kyoto University (京都大学)0048
新制・課程博士
博士(農学)
甲第9623号
農博第1251号
新制||農||843(附属図書館)
学位論文||H14||N3655(農学部図書室)
UT51-2002-G381
京都大学大学院農学研究科地域環境科学専攻
(主査)教授 河地 利彦, 教授 青山 咸康, 教授 高橋 強
学位規則第4条第1項該当
28
Kern, James D. „Water Quality Impacts of Cover Crop/Manure Management Systems“. Diss., Virginia Tech, 1997. http://hdl.handle.net/10919/40385.
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Crop production, soil system, water quality, and economic impacts of four corn silage production systems were compared through a field study including 16 plots (4 replications of each treatment). Systems included a rye cover crop and application of liquid dairy manure in the spring and fall.
The four management systems were: 1) traditional, 2) double-crop, 3) roll-down, and 4) undercut. In the fourth system, manure was applied below the soil surface during the undercutting process. In all other systems, manure was surface-applied. In the third system, the rye crop was flattened with a heavy roller after manure application.
Simulated rainfall was applied within 48 h of manure application. Measured constituent concentrations in runoff were compared with water quality criteria. Costs and returns of all systems were compared. The undercut system reduced loadings of all nutrients, but increased total suspended solids (TSS) concentration as compared with all other systems. The mean volume of runoff from the undercut system was less than half that from any other system, which influenced all constituent loadings. Mean TSS concentration in runoff from the undercut system was over three times the mean of any other system. The roll-down system had no significant effect on water quality as compared to the traditional system. The undercut system was reasonably effective in keeping phosphate phosphorus levels below the criterion set for bathing water. None of the systems generally exceeded nitrate nitrogen concentration criteria.
However, total phosphorus, orthophosphate, fecal coliform and e. coli criteria for drinking, bathing, shellfish harvest, and aesthetics were regularly exceeded by all of the systems. There were no differences among the treatments in effects on bacterial concentrations. The double-crop system produced significantly higher net returns than all other systems only if the value of the rye crop was $92.31/Mg or more. There were no significant differences in net returns of the traditional, roll-down, or undercut systems.Ph. D.
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Ottman, M. J., und T. A. Doerge. „Durum Quality is Related to Water and Nitrogen Management“. College of Agriculture, University of Arizona (Tucson, AZ), 1994. http://hdl.handle.net/10150/201419.
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Shao, Wanyun. „An analysis of water quality policy and management in China an examination of water planning at the national and local level /“. Laramie, Wyo. : University of Wyoming, 2009. http://proquest.umi.com/pqdweb?did=1939339341&sid=1&Fmt=2&clientId=18949&RQT=309&VName=PQD.
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Sherwood, Julia M. „Modelling minewater flow and quality changes after coalfield closure“. Boston Spa, U.K. : British Library Document Supply Centre, 1997. http://ethos.bl.uk/OrderDetails.do?did=1&uin=uk.bl.ethos.363536.
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Chang, Lydia. „Transport of dinoflagellate cysts through ballast water and its implications for marine water monitoring in Hong Kong /“. [Hong Kong : University of Hong Kong], 1994. http://sunzi.lib.hku.hk/hkuto/record.jsp?B13813481.
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English, April Renee Atkinson Samuel F. „Stream water quality corridor assessment and management using spatial analysis techniques introduction, evaluation and implementation of the WQCM model /“. [Denton, Tex.] : University of North Texas, 2007. http://digital.library.unt.edu/permalink/meta-dc-3976.
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Morillo, Sebastian. „Engineering solutions to water quality problems in lakes“. University of Western Australia. Centre for Water Research, 2008. http://theses.library.uwa.edu.au/adt-WU2008.0153.
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Lake restoration and management strategies focus on reducing the negative impacts of enriched or polluted inflows. These strategies become of paramount importance when lakes are used for recreational and/or drinking water purposes. Long term control of eutrophication and turbidity problems associated with large inflow loads is usually oriented to catchment management. Although it has been suggested that this is the correct long term approach, public concerns usually require a short term solution. In addition, due to political and economic costs related to changes in catchment management, in-lake restoration technologies have been emerging as a viable pretreatment option, complementary to water treatment plants, both reducing the operational costs of the water treatment plant and ameliorating the water residing in the lakes. This research investigates the effects of two in-lake technologies on the dynamics of inflowing rivers, where basin shape plays a significant role. The three lakes in this study suffer from eutrophication combined with a distinctive water quality problem: from turbidity in Silvan Reservoir (Australia), to heavy metal loads in Coeur d'Alene Lake (USA) and industrial wastes in Lake Como (Italy). Firstly, the influence of basin morphology, wind speed, and wind direction on the fate and transport of two rivers flowing into the L-shaped Coeur d'Alene Lake was examined, and it was shown that transport and mixing patterns in a lake can be greatly influenced by the shape of the lake, leading to important consequences for the plankton ecology in the lake. Secondly, in Silvan Reservoir we investigated the potential to modify the basin shape using vertical barriers, increasing the retention time and hence the barrier capacity to microbial pollution. A final in-lake technology was tested for Lake Como, using a downward pointing impeller to remove polluted water from the coastal margin. Lessons from these three examples indicate that there is significant potential for in-lake remediation at relatively low cost, over relatively short timescales.
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Tillman, Dorothy Hamlin. „Coupling of ecological and water quality models for improved water resource and fish management“. [College Station, Tex. : Texas A&M University, 2008. http://hdl.handle.net/1969.1/ETD-TAMU-2334.
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Mejia, Manuel Armando. „Effects of water table management on water quality and strip-cropped corn-soybean yields“. Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp01/MQ29753.pdf.
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Mejía, Manuel. „Effects of water table management on water quality and strip cropped corn-soybean yields“. Thesis, McGill University, 1997. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=27378.
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A two-year field study was carried out in eastern Ontario to investigate the effects of water table management (WTM) on water quality and crop yields. Corn (Zea mays L.) and soybean (Glycine max Merr.) were planted in alternate strips across the three treatments of 50 cm controlled water table (CWT), 75 cm CWT and free drainage (FD). Drainflow volume and nitrate-N concentration of the drainage water were measured. Soil samples were collected and analysed for total N, P, K, available N, soil moisture and organic matter levels. Chlorophyll-meter readings and plant harvest parameters were also measured. Rainfall, soil and air temperatures were recorded throughout the growing seasons.The obtained data show that in 1995, the CWT plots significantly increased total drainflow, as compared to FD. In 1996, overall drainflow and nitrate concentrations were significantly reduced. Both the corn and soybean yields were higher with WTM than with FD for both years. (Abstract shortened by UMI.)
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Wu, Shaoming. „Multiobjective water quality management planning for the Lake Erhai Watershed“. Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/mq30573.pdf.
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Coulibaly, Housseini. „Drinking water quality and management strategies in small Quebec utilities“. Thesis, Université Laval, 2003. http://www.theses.ulaval.ca/2003/21382/21382.pdf.
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La présente thèse porte sur une étude des petits systèmes municipaux du Québec (en l’occurrence, ceux desservant 10 000 personnes ou moins) et comporte trois volets. Le premier volet se focalise sur un portrait historique de la qualité de l’eau distribuée et sur les stratégies de gestion. Parallèlement, il met l'historique de la qualité et les stratégies de gestion en relation avec certains paramètres importants de la qualité de l’eau. Les résultats de ce volet montrent que pour les systèmes s’approvisionnant en eau de surface et pratiquant uniquement une chloration, la différence entre le nombre annuel moyen de rinçages des systèmes ayant connu des problèmes de qualité et ceux n’ayant pas connu de tels problèmes s’est avérée statistiquement significative. En plus, certains indicateurs de la pression agricole sur le territoire des municipalités concernées apparurent significativement corrélés avec les épisodes de coliformes. Le deuxième volet porte sur une étude de la variation spatio-temporelle de la qualité de l’eau dans dix petits systèmes. Ces systèmes furent répartis en deux groupes : quatre systèmes qui n’ont jamais ou ont rarement distribué de l’eau dérogeant aux normes microbiologiques provinciales relatives à l’eau potable et six systèmes qui ont très souvent dérogé auxdites normes. Les résultats montrent que les différences entre les deux groupes de systèmes sont essentiellement imputables aux teneurs en chlore résiduel libre et au nombre de colonies de bactéries hétérotrophes aérobies et anaérobies facultatives (BHAA) dans les réseaux de distribution correspondants et, dans une moindre mesure, aux doses de chlore appliquées. Le troisième volet inclut trois parties : la première est un portait des caractéristiques d’opération, de l’infrastructure et de la maintenance ; la deuxième est consacrée au développement d’indicateurs de performance pour les petits systèmes ; alors que la troisième traite des facteurs humains et organisationnels. Le portrait a révélé des tendances intéressantes qui ont presque toutes été confirmées par les indicateurs de performance des systèmes de distribution. Les facteurs humains et organisationnels dégagèrent des aspects tels que les antécédents scolaires, la formation complémentaire, l’expérience, la bonne conscience des nouveaux défis, le niveau de préparation pour y faire face, et l’appui des autorités locales. Dans son ensemble, cette recherche aura permis de procéder à une étude exhaustive des stratégies de gestion de la qualité de l’eau potable généralement mises de l’avant par les gestionnaires de petits systèmes et de développer des outils explicatifs pouvant guider utilement leur action, de même que celle des gestionnaires relevant des divers paliers gouvernementaux.This thesis presents a study of small Quebec municipal utilities (i.e., serving 10,000 people or fewer) and includes three chapters. The first chapter focuses on a portrait of historical quality of distributed water and on management strategies. Concurrently, it puts historical quality and management strategies in relation to certain important water quality parameters. Results show that for surface water utilities using chlorination alone, the mean difference of annual system flushings between utilities that have experienced difficulties with historical quality and those not having experienced such difficulties proved statistically significant. In addition, some agricultural land-use indicators within the municipal territory appeared significantly correlated with coliform occurrences. The second chapter studies the spatial and temporal variation of drinking water quality in ten small utilities. These utilities were divided into two groups: four utilities that had never or rarely served water violating the provincial drinking water microbiological standards and six utilities that very often infringed upon said standards. Results show that the differences between the two groups of utilities are associated essentially with maintained chlorine residuals and heterotrophic plate count bacteria populations in corresponding distribution systems and, to a lesser extent, to the applied chlorine doses. The study includes three distinctive parts: the first one is a portrait of studied utilities’ operational, infrastructure, and maintenance characteristics; the second part is devoted to development of indicators of performance for the same utilities, whereas the last part deals with human and organisational factors. The portrait revealed interesting trends, most of which had been confirmed by utility performance indicators. As for human and organizational factors, they allowed highlighting such issues like educational background, supplementary training, experience, awareness of and preparedness to take up new challenges, and support from local authorities. Overall, this research enabled a thorough investigation of management strategies the most popular with small drinking water utilities and the development of explanatory tools that may usefully guide action from local managers and government bodies.
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Momoh, Jinnah Samuel. „Decision support system for river water quality forecasting and management“. Thesis, University of Newcastle Upon Tyne, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.246651.
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Norreys, Richard. „Water quality river impact model (RIM) for river basin management“. Thesis, University of Salford, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.305863.
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Basahi, Ilham A. „Management of water quality of the Marib Lake in Yemen“. Thesis, University of Newcastle upon Tyne, 2003. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.289214.
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Coulibaly, Housseini Diadié. „Drinking water quality and management strategies in small Quebec utilities“. Doctoral thesis, Université Laval, 2003. http://hdl.handle.net/20.500.11794/17867.
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La présente thèse porte sur une étude des petits systèmes municipaux du Québec (en l’occurrence, ceux desservant 10 000 personnes ou moins) et comporte trois volets. Le premier volet se focalise sur un portrait historique de la qualité de l’eau distribuée et sur les stratégies de gestion. Parallèlement, il met l'historique de la qualité et les stratégies de gestion en relation avec certains paramètres importants de la qualité de l’eau. Les résultats de ce volet montrent que pour les systèmes s’approvisionnant en eau de surface et pratiquant uniquement une chloration, la différence entre le nombre annuel moyen de rinçages des systèmes ayant connu des problèmes de qualité et ceux n’ayant pas connu de tels problèmes s’est avérée statistiquement significative. En plus, certains indicateurs de la pression agricole sur le territoire des municipalités concernées apparurent significativement corrélés avec les épisodes de coliformes. Le deuxième volet porte sur une étude de la variation spatio-temporelle de la qualité de l’eau dans dix petits systèmes. Ces systèmes furent répartis en deux groupes : quatre systèmes qui n’ont jamais ou ont rarement distribué de l’eau dérogeant aux normes microbiologiques provinciales relatives à l’eau potable et six systèmes qui ont très souvent dérogé auxdites normes. Les résultats montrent que les différences entre les deux groupes de systèmes sont essentiellement imputables aux teneurs en chlore résiduel libre et au nombre de colonies de bactéries hétérotrophes aérobies et anaérobies facultatives (BHAA) dans les réseaux de distribution correspondants et, dans une moindre mesure, aux doses de chlore appliquées. Le troisième volet inclut trois parties : la première est un portait des caractéristiques d’opération, de l’infrastructure et de la maintenance ; la deuxième est consacrée au développement d’indicateurs de performance pour les petits systèmes ; alors que la troisième traite des facteurs humains et organisationnels. Le portrait a révélé des tendances intéressantes qui ont presque toutes été confirmées par les indicateurs de performance des systèmes de distribution. Les facteurs humains et organisationnels dégagèrent des aspects tels que les antécédents scolaires, la formation complémentaire, l’expérience, la bonne conscience des nouveaux défis, le niveau de préparation pour y faire face, et l’appui des autorités locales. Dans son ensemble, cette recherche aura permis de procéder à une étude exhaustive des stratégies de gestion de la qualité de l’eau potable généralement mises de l’avant par les gestionnaires de petits systèmes et de développer des outils explicatifs pouvant guider utilement leur action, de même que celle des gestionnaires relevant des divers paliers gouvernementaux.This thesis presents a study of small Quebec municipal utilities (i.e., serving 10,000 people or fewer) and includes three chapters. The first chapter focuses on a portrait of historical quality of distributed water and on management strategies. Concurrently, it puts historical quality and management strategies in relation to certain important water quality parameters. Results show that for surface water utilities using chlorination alone, the mean difference of annual system flushings between utilities that have experienced difficulties with historical quality and those not having experienced such difficulties proved statistically significant. In addition, some agricultural land-use indicators within the municipal territory appeared significantly correlated with coliform occurrences. The second chapter studies the spatial and temporal variation of drinking water quality in ten small utilities. These utilities were divided into two groups: four utilities that had never or rarely served water violating the provincial drinking water microbiological standards and six utilities that very often infringed upon said standards. Results show that the differences between the two groups of utilities are associated essentially with maintained chlorine residuals and heterotrophic plate count bacteria populations in corresponding distribution systems and, to a lesser extent, to the applied chlorine doses. The study includes three distinctive parts: the first one is a portrait of studied utilities’ operational, infrastructure, and maintenance characteristics; the second part is devoted to development of indicators of performance for the same utilities, whereas the last part deals with human and organisational factors. The portrait revealed interesting trends, most of which had been confirmed by utility performance indicators. As for human and organizational factors, they allowed highlighting such issues like educational background, supplementary training, experience, awareness of and preparedness to take up new challenges, and support from local authorities. Overall, this research enabled a thorough investigation of management strategies the most popular with small drinking water utilities and the development of explanatory tools that may usefully guide action from local managers and government bodies.
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Dyck, Amber. „Ditch Management in Agroecosystems: From Water Quality to Frog Health“. Thesis, Université d'Ottawa / University of Ottawa, 2020. http://hdl.handle.net/10393/40969.
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Agriculture ditch management (i.e. removal of vegetation and/or sediments) may disturb native wildlife, such as amphibian bioindicator species. The objective of this thesis was to determine whether ditch management affected northern leopard frogs (Lithobates pipiens). Twelve embryo and tadpole health endpoints were compared in vegetated and managed (treeless or dredged) ditches using in situ cages in 2018 and 2019, while water quality was monitored. The managed treatment did not negatively affect frog health compared to the vegetated treatment. The significantly faster development and larger body size due to warmer water temperatures at the managed treatment were likely advantageous. The water quality was typical of the region regardless of the ditch treatment and the pesticide mixture detected had limited toxicity. The main effects of the studied ditch managements on resident L. pipiens (and potentially other amphibians) appeared sub-lethal, likely beneficial, and mainly the result of temperature differences. Although poorer embryo health was observed at the vegetated treatment, it was likely unrelated to ditch management and possibly due to high specific conductivity causing premature hatching and mortality. Ditch management may be less important for frog health than the surrounding land use, and efforts should be directed at increasing suitable habitat for amphibians in agroecosystems. La gestion des fossés agricoles (plus spécifiquement l'élimination de la végétation des bandes riveraines et /ou le dragage des sédiments) peut perturber la faune indigène, comme les espèces bio-indicateurs d'amphibiens. L'objectif de cette thèse était de déterminer si la gestion des fossés affectait la grenouille léopard du Nord (Lithobates pipiens). Douze paramètres d'évaluation de la santé des embryons et des têtards ont été comparés dans des fossés végétalisés et gérés (sans arbres ou dragués) à l'aide de cages expérimentales in situ en 2018 et 2019, pendant que la qualité de l'eau a été suivie. Le traitement géré n'a pas eu d'effets négatifs sur la santé des grenouilles par rapport au traitement végétalisé. Le développement beaucoup plus rapide et la taille corporelle plus grande en raison des températures plus chaudes de l'eau lors du traitement géré étaient probablement avantageux. La qualité de l'eau était typique de la région quel que soit le traitement du fossé et le mélange de pesticides détecté avait une toxicité limitée. Les principaux effets de la gestion des fossés étudiés sur L. pipiens résidents (et potentiellement d'autres amphibiens) semblaient sublétaux, probablement bénéfiques, et résultaient principalement de différences de température. Bien que la santé des embryons ait été moins bonne lors du traitement végétalisé, elle n'était probablement pas liée à la gestion des fossés et pourrait être due à une conductivité spécifique élevée entraînant une éclosion prématurée et la mortalité. La gestion des fossés peut être moins importante pour la santé des grenouilles que l'utilisation des terres environnantes, et les efforts de protection devraient être dirigés vers une augmentation générale de l'habitat approprié pour les amphibiens dans les agroécosystèmes.
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Xu, Yuelu. „Essays on Water Quality Management for the Chesapeake Bay Watershed“. Diss., Virginia Tech, 2020. http://hdl.handle.net/10919/96943.
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Water quality management for agricultural production is a complicated and interesting problem. Hydrological and economic factors must be considered when designing strategies to reduce nutrient runoff from agricultural activities. This dissertation is composed of three chapters that investigate cost-effective ways to mitigate water pollution from agricultural nonpoint pollution sources and explore farmers' incentives when participating in water quality trading programs.
Chapter 1 investigates landscape targeting of best management practices (BMPs) based on topographic index (TI) to determine how targeting would affect costs of meeting nitrogen (N) loading goals for Mahantango watershed, Pennsylvania. We use the results from two climate models and the mean of the ensemble of seven climate models to estimate expected climate changes and the Soil and Water Assessment Tool-Variable Source Area (SWAT-VSA) model to predict crop yields and N export. Costs of targeting and uniform placement of BMPs across the entire study area (4.23 km2) are compared under historical and future climate scenarios. We find that with a goal of reducing N loadings by 25%, spatial targeting methods could reduce costs by an average of 30% compared with uniform BMP placement under three historical climate scenarios. Cost savings from targeting are 38% under three future climate scenarios. Chapter 2 scales up the study area to the Susquehanna watershed (71,000 km2). We examine the effects of targeting the required reductions in N runoff within counties, across counties, and both within and across counties for the Susquehanna watershed. We set the required N reduction to 35%. Using the uniform strategy to meet the required N reduction as the baseline, results show that costs of achieving a regional 35% N reduction goal can be reduced by 13%, 31% and 36% with cross-county targeting, within-county targeting and within and across county targeting, respectively.
Results from Chapters 1 and 2 suggest that cost effectiveness of government subsidy programs for water quality improvement in agriculture can be increased by targeting them to areas with lower N abatement costs. In addition, targeting benefits are likely to be even larger under climate change.
Chapter 3 investigates the landowner's nutrient credit trading behavior when facing the price uncertainty given the credits are allowed to be banked for future use. A two-step decision model is used in this study. For the first step, we determine the landowner's application level of a BMP on working land in the initial time period. The nutrient credits awarded to the landowner depend on the nutrient reduction level at the edge of field generated by the BMP application. For the second step, we use an intertemporal model to examine the landowner's credit trading behavior with stochastic price fluctuations over time and with transaction costs. The theoretical framework is applied with a numerical simulation incorporated with a hydro-economic model and dynamic programming. Nutrient Management (NM) is selected as the BMP on working land to generate N credits. We find that gains to the landowner from credit banking increase with higher price volatility and with higher price drift, but that gains are larger with price volatility. However, for a landowner holding a small amount of nutrient credits, the gains from credit banking are small due to transaction costs.Doctor of Philosophy
Two considerations are critical for efforts to mitigate nutrient runoff from nonpoint sources: cost effectiveness of strategies to reduce nutrient runoff and landowners' incentives to participate in these programs. This dissertation is composed of three manuscripts, aiming to evaluate the cost effectiveness of government subsidy programs for water quality management in agriculture and investigate the landowner's incentives to participate in water quality trading programs for the Chesapeake Bay watershed. Chapter 1 investigates gains from targeting Best Management Practices (BMPs) under current and future climate conditions based on the soil characteristics relative to uniform BMP application for a small experimental watershed (4.23km2). Chapter 2 scales up the study area to a 71,000 km2 watershed and treats each county within the watershed as a representative farm to explore economic gains from targeting within county and across county based on counties' physical conditions and agricultural patterns. Both Chapters show that cost-effectiveness of government subsidy programs can be improved by spatial targeting BMPs to areas with lower abatement costs. Gains from targeting increase under climate change. In Chapter 3 we shows how a landowner's revenues from nutrient credit selling will be affected if the credits are allowed to be banked for future use when she faces price uncertainty. We find that gains to the landowner from credit banking increase more with higher price volatility than with higher price drift. Gains from banking are largely reduced by transaction costs associated with trading.
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Bernotas, Scott. „Water quality management of bilge wastes at Pearl Harbor, Hawaii“. Thesis, Honolulu, Hawaii : University of Hawaii, 1992. http://handle.dtic.mil/100.2/ADA257636.
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Thesis (M.S. in Civil Engineering)--University of Hawaii, 1992."December 1992." Description based on title screen as viewed on April 8, 2009. Includes bibliographical references (p. 140). Also available in print.
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Ali, Md Kamar. „Stream water quality management a stochastic mixed-integer programming model /“. Morgantown, W. Va. : [West Virginia University Libraries], 2002. http://etd.wvu.edu/templates/showETD.cfm?recnum=2450.
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Thesis (Ph. D.)--West Virginia University, 2002.Title from document title page. Document formatted into pages; contains xi, 158 p. : ill. (some col.), col. map. Vita. Includes abstract. Includes bibliographical references (p. 126-132).
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So, King-lung Benny. „A review of drinking water management in Hong Kong /“. Hong Kong : University of Hong Kong, 1999. http://sunzi.lib.hku.hk/hkuto/record.jsp?B21301402.
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Guan, Jiabao. „Applications of genetic algorithms in groundwater quality management“. Diss., Georgia Institute of Technology, 1998. http://hdl.handle.net/1853/20491.
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Harper, Stephen Ray. „Evaluation of hydrogen management during anaerobic wastewater treatment“. Diss., Georgia Institute of Technology, 1989. http://hdl.handle.net/1853/23127.
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