Dissertations / Theses on the topic 'Catchment'
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Warburton, Toni. "Catchment." Thesis, The University of Sydney, 2000. https://hdl.handle.net/2123/27946.
Full textMaterechera, Fenji. "Towards integrated catchment management : challenges surrounding implementation in the Gamtoos River catchment." Thesis, Nelson Mandela Metropolitan University, 2012. http://hdl.handle.net/10948/d1018553.
Full textZanardo, Stefano. "Catchment-scale transport phenomena: rainfall intermittency, age of runoff, anthropic catchment management." Doctoral thesis, Università degli studi di Padova, 2011. http://hdl.handle.net/11577/3427400.
Full textLa complessità dei fenomeni di trasporto alla scala di bacino deriva dall'interconnessione di diversi processi su diverse scale temporali e spaziali. La risposta idrologica e biogeochimica dei bacini è il prodotto di interazioni altamente non lineari tra le forzanti meteorologiche, le eterogeneità del territorio e le attività umane. Di conseguenza, semplici analisi sperimentali non permettono un'adeguata comprensione dei processi coinvolti, e l'analisi di questi fenomeni rappresenta un obiettivo ambizioso. Tuttavia, l'esplorazione di questi processi è importante per valutare i controlli dominanti su meccanismi di trasporto alla scala di bacino e predirne la risposta idrologica e biogeochimica a perturbazioni climatiche ed alla gestione del territorio. Questo è particolarmente importante nel caso di ecosistemi in cambiamento, dove una profonda comprensione dei processi è fondamentale per una corretta gestione del territorio e delle risorse idriche. Lo scopo di questa tesi è l'analisi di fenomeni di trasporto alla scala di bacino attraverso l'applicazione di nuovi approcci modellistici a casi studio di interesse. A questo scopo si è utilizzato sia un approccio probabilistico sia un approccio deterministico: il primo richiesto dalla natura casuale di numerosi processi fisici coinvolti, il secondo necessario per analizzare le dinamiche sotto condizioni ben definite. Lo studio è supportato da una robusta analisi dei dati disponibili, il cui scopo non è semplicemente quello di validare i modelli ma piuttosto di fornire una comprensione più approfondita delle dinamiche in gioco. Gli effetti di fluttuazioni idrologiche nel lungo termine sono simulati attraverso distribuzioni di probabilità stazionarie relative a grandezze fisiche rilevanti. Questo approccio modellistico fornisce una relazione causale tra la fluttuazione giornaliera della pioggia e la fluttuazione giornaliera dei deflussi, la quale, a sua volta, è messa in relazione con l'atezza di moto nei corsi d'acqua ed infine con i processi rimozione di nutrienti nelle reti idrografiche. Tale approccio stocastico è successivamente utilizzato per valutare l'effetto delle fluttuazioni giornaliere delle precipitazioni sulla variabilità inter-annuale del bilancio idrico alla scala di bacino. L'applicazione del modello ad un esteso numero di bacini sperimentali, distribuiti sul territorio degli Stati Uniti, mostra come esistano alcune regioni dove le fluttuazioni della pioggia giornaliera rappresentano il controllo principale sulla la variabilità inter-annuale del bilancio idrico, ed altre regioni dove questa variabilità è determinata da altri processi che non necessariamente avvengono alla scala giornaliera. Un modello deterministico, detto Mass Response Function (MRF), è utilizzato per valutare l'effetto delle eterogeneità del suolo e dei meccanismi di mescolamento sulla risposta idrologica e biogeochimica dei bacini. Il concetto principale che caratterizza questo approccio si basa sull'assunzione che l'evoluzione degli impulsi di acqua e soluti che si muovono nel suolo sia prevalentemente governata dal relativo tempo di residenza. L'applicazione del modello MRF ad uno studio di traccianti effettuato utilizzando nitrati e litio suggerisce che i deflussi sono composti da un insieme di impulsi aventi differenti età e che, almeno nel caso in esame, l'effetto di flussi preferenziali non mescolati può essere trascurato. Il modello MRF è stato successivamente accoppiato con un modello detto `source zone' atto a simulare il rilascio di pesticidi dallo strato superficiale del suolo in bacini intensamente antropizzati. L'aggiunta di questo secondo modello si è dimostrata necessaria per rappresentare accuratamente le dinamiche di trasporto dei pesticidi. L'applicazione ad un caso di studio sperimentale suggerisce come la previsione della risposta agro-chimica richieda un'accurata conoscenza della pratiche agricole utilizzate. In particolare, l'intervallo tra la data di applicazione dei pesticidi e i primi eventi di pioggia successivi sembra costituire il fattore principale nelle dinamiche di rilascio di contaminanti. Queste considerazioni sono di particolare interesse nella modellazione dei pesticidi in quanto di origine esclusivamente antropica. Nel caso invece della modellazione contaminanti quali i nutrienti, la componente antropica può venire oscurata dalla produzione chimica del suolo.
Mehl, Daniel James Gustav. "Assessing the influence of floodplain wetlands on wet and dry season river flows along the Nuwejaars River, Western Cape, South Africa." University of the Western Cape, 2019. http://hdl.handle.net/11394/7031.
Full textImproved knowledge is required on the quantity and source of water resources, particularly evident during periods of drought currently being faced in South Africa. There is inadequate knowledge with regards to the flood attenuating properties of wetlands, particularly evident in the ungauged catchments of Southern Africa. This study aims to improve the knowledge on the contribution of flow from tributaries with headwaters in mountainous regions to low lying areas and the effects of wetlands on river flow patterns. Several river flow monitoring sites were established along the major upper tributaries of the Nuwejaars River at which daily water levels were recorded and bi-weekly discharge measurements were conducted. Weather data was collected using four automatic weather stations and three automatic rain gauges’ setup throughout the catchment. Rainfall data coupled with rating curves and daily discharges were used to assess the flow responses of these tributaries to rainfall events. Additionally, stable isotope analysis and basic water quality analysis was used to determine the major sources of flow within the major tributaries. The rainfall and river flow data collected, coupled with the characterization of the wetland was used to determine the flood attenuation capabilities of the wetland. Lastly, a conceptual model based on a basic water balance was developed to further explain the role of the wetland and its effects on river flows. The results showed a 27-hour lag time in peak flows from the upper tributaries at the inflows of the wetland to the outflow. Two of the upper tributaries had flow throughout the year and were fed by springs in the upper mountainous regions of the catchment and all tributaries were largely reliant on rainfall for peak flows. The temporary storage of flows within the wetland occurred as a result of the Nuwejaars River bursting its banks, filling of pools, or ponds and the Voëlvlei Lake. It was concluded that the wetland increased the travel time and decreased the magnitude of flows of the Nuwejaars River. However, due to the fact that wetlands are interlinked on a catchment scale and have a collective effect on flood attenuation this study may be improved by looking at the wetlands within the catchment holistically.
Shepherd, Christina. "Towards integrated catchment management : institutional arrangements : a case study of the Patawalonga catchment /." Title page, table of contents and abstract only, 1994. http://web4.library.adelaide.edu.au/theses/09ENV/09envs5478.pdf.
Full textDriscoll, Jessica Margit. "Impacts of Climate Change in Snowmelt-Dominated Alpine Catchments: Development and Assessment of Comparative Methods to Quantify the Role of Dynamic Storage and Subsurface Hydrologic Processes." Diss., The University of Arizona, 2015. http://hdl.handle.net/10150/560860.
Full textDavidson, Celene. "Catchment diagnostic framework for the Klip River catchment, Vaal Barrage, October 1998 - September 1999." Thesis, University of the Witwatersrand, Johannesburg, 2003. http://hdl.handle.net/10539/21298.
Full textAC 2016
Lindblom, Karin. "PFAS in Gullspångsälvens catchment area." Thesis, Örebro universitet, Institutionen för naturvetenskap och teknik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:oru:diva-64608.
Full textSingh, Anupam K. "Towards decision support models for an ungauded catchment in India : the case of Anas catchment." Karlsruhe : Institut für Wasserwirtschaft und Kulturtechnik, Universität Karlsruhe (TH), 2004. http://www.ubka.uni-karlsruhe.de/eva/index.html.
Full textHiggins, David Ian. "Catchment scale influences on brown trout fry populations in the Upper Ure catchment, North Yorkshire." Thesis, Durham University, 2011. http://etheses.dur.ac.uk/3571/.
Full textAbrahams, Ebrahiem. "Measurement and modelling of catchment erosion dynamics under different land cover types, Jonkershoek Catchment, Western Cape." University of the Western Cape, 2020. http://hdl.handle.net/11394/7292.
Full textSeveral attempts have been made to assess the impact of post-fire soil erosion; however, erosion occurs as a result of the complex interplay between many factors, such as climate, land cover, soil and topography, making precise estimation difficult. Additionally, these factors are far from constant in space and time, and often interact with one another. To assess the impact of wildfire on soil erosion and factors influencing its variability, the post-fire soil erosion response of two mountainous headwater sub-catchments namely Langrivier and Tierkloof, with different vegetation cover in the Jonkershoek Valley was examined using a systematic approach that combines efforts in field and laboratory work, spatial analysis and process-based numerical modelling. Geospatial modelling shows high spatial variability in erosion risk, with 56 % to 67 % of surfaces being highly susceptible excluding rock cover. The model highlights the importance of terrain and vegetation indices, with predicted erosion being more severe on steep slopes with lower vegetation cover.
2021-08-30
Arnott, Sean. "An assessment of methods for catchment-scale identification of goundwater-suface water interractions in lowland permeable catchments." Thesis, University of Exeter, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.532017.
Full textSvensson, Teresia. "Chlorine Transport in a Small Catchment." Doctoral thesis, Linköping : Univ, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-6316.
Full textVincent, Craig Nicholas. "Hydrogeology of the Upper Selwyn Catchment." Thesis, University of Canterbury. Geological Sciences, 2005. http://hdl.handle.net/10092/1137.
Full textGranger, Erika C. "Water Quality Modeling in Kranji Catchment." Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/60762.
Full text"June 2010." Cataloged from PDF version of thesis.
Includes bibliographical references (p. 50-52).
This thesis describes the process and results of applying the Soil and Water Assessment Tool (SWAT) to characterize bacterial fate and transport in the Kranji Catchment of Singapore. The goal of this process is to predict bacterial loading to Kranji Reservoir under the forcing of weather and other variables. Necessary data and input values were collected or estimated and input into the model. One of the most important of these values is the bacterial die-off rate. This rate must be accurate for the model to provide accurate predictions of bacterial loadings. In order to obtain a value for the bacterial die-off rate, an attenuation study was conducted. The results of this study were not typical. Bacterial growth was observed to occur during dark hours, and decay was observed to occur during sunlit hours. The resulting light and dark decay constants were combined for use in the model. The specific bacterial loading rates associated with the various agricultural activities occurring in the catchment are not available and thus were roughly estimated. Point source loadings were also estimated. Four years of model simulation daily output were analyzed, and results for specific subcatchments with differing character are discussed. This application of SWAT shows a good ability to make qualitative predictions of the presence or absence of bacteria; however, quantitative agreement between model predictions and field observations is poor. This run of the model is like a first draft-more refinement and more information are needed before it will make accurate predictions; however, the framework is in place.
by Erika C. Granger.
M.Eng.
Sundström, Linn. "Investigating the impact of the Millennium Drought on catchment water balance : A study of four catchments in Victoria, Australia." Thesis, KTH, Hållbar utveckling, miljövetenskap och teknik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-231134.
Full textUnder åren 1997–2009 minskade den genomsnittliga årliga nederbörden över sydöstra Australien med 11.4% och den genomsnittliga årliga avrinningen var lägre än någonsin tidigare samtidigt som grundvattennivåerna sjönk. Denna torka brukar kallas the Millennium Drought och är den svåraste torkan i Australien i modern tid. Torkan tog officiellt slut 2010 då ett av de mest kraftfulla La Niña-fenomenen inträffade vilket bidrog till att april 2010 till mars 2012 var de blötaste två åren i australiensk historia. Trots att flera studier har gjorts kring torkan så är det ännu inte klarlagts hur avrinningsområdena i området påverkades och om de fortfarande är påverkade när torkan officiellt är över. Flödena inom ett avrinningsområde bestäms vanligtvis genom en vattenbalans. Då vattenbalansen över ett avrinningsområde studeras under en längre tid antas ofta att förändringarna i grundvattenmagasinen går att bortse från då grundvattennivån ofta återgår till samma stadie efter ett antal år. Nyare studier har dock visat att detta inte alltid är fallet vid exempelvis en svår torka och att det vid dessa fall inte är korrekt att anta att förändringen i grundvattenmagasinen är försumbar. I denna studie har en vattenbalans gjorts för fyra avrinningsområden i delstaten Victoria i Australien. Syftet har varit att avgöra om vattenbalansen kan förbättras om förändringen i grundvattenmagasinen inkluderas. Detta har gjorts genom att använda nyligen framtagen data för grundvattennivån i delstaten och antagit att den dränerbara porositeten är en okänd variabel. För att justera för osäkerheterna kring the kända flödena har en okänd faktor för evapotranspirationen inkluderats. De okända variablerna bestämdes i en kalibrering. Kalibreringen genomfördes för två olika kalibreringsscheman och för tre olika tidsperioder. Det ena kalibreringsschemat antog att grundvattnet direkt reagerade på effektiv nederbörd minus avrinning, medan den andra kalibreringsschemat tog hänsyn till en försenad reaktion. Kalibreringen gjordes för tidsperioderna innan, under och efter torkan. Resultaten visade att när ingen hänsyn togs till en eventuellt försenad reaktion av grundvatten så går värdet för dränerbar porositet i minst en geologisk enhet mot noll medan det andra värdet är rimligt. När hänsyn togs till en försenad reaktion av grundvattnet, fick fler avrinningsområde rimliga värden för dränerbar porositet för hela området. Slutsatsen som kan dras kring detta är att vattenbalansen kan förbättras om förändringen i grundvattenmagasinen inkluderas. Detta kräver dock en djupgående analys av grundvattnet och geologin i avrinningsområdet. Hur mycket flödena förändrades under och efter torkan varierar mellan avrinningsområdena och flödena, gemensamt var dock att alla flöden minskade under torkan. Två av avrinningsområdena påvisade en förändring i beteendet under torkan och de år som följde. Det är mest troligt att förändringarna i avrinning och grundvattenmagasinen har påverkat detta. De övriga två avrinningsområdena påvisade även de en förändring under torkan, om än mindre än för de föregående. Denna förändring ser även ut att vara på tillbakagående och att avrinningsområdet inom en snar framtid skulle kunna ha samma tillstånd som innan torkan. De mest troliga flödena som har påverkat dessa avrinningsområden är förändringar i avrinning och den faktisk evapotranspirationen.
Whelan, Michael John. "Numerical modelling of small catchment nitrogen dynamics with particular reference to the Slapton Wood catchment, South Devon." Thesis, University of Leeds, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.343483.
Full textJahandideh-Tehrani, Mahsa. "Development of an integrated catchment model framework for climate change impacts assessment: The Nerang River catchment, Australia." Thesis, Griffith University, 2020. http://hdl.handle.net/10072/400453.
Full textThesis (PhD Doctorate)
Doctor of Philosophy (PhD)
School of Eng & Built Env
Science, Environment, Engineering and Technology
Full Text
Näschen, Kristian [Verfasser]. "Impact assessment of global change on wetland-catchment interactions in a tropical East African catchment / Kristian Näschen." Bonn : Universitäts- und Landesbibliothek Bonn, 2020. http://d-nb.info/1207923427/34.
Full textRehn, Lukas. "Temporal Trends in Dissolved Inorganic Carbon in a Swedish Boreal Catchment." Thesis, Uppsala universitet, Institutionen för geovetenskaper, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-435368.
Full textWallin, Marcus. "Carbon dioxide evasion from a boreal catchment /." Uppsala : Sveriges lantbruksuniversitet, 2005. http://info1.ma.slu.se/IMA/Publikationer/internserie/2005-18.pdf.
Full textNelson, Tracy Jane. "Identifying sediment sources in the Tees catchment." Thesis, Durham University, 2003. http://etheses.dur.ac.uk/3684/.
Full textRobson, Matthew Thomas. "Stream quality in a small urbanised catchment." Thesis, Sheffield Hallam University, 2004. http://shura.shu.ac.uk/20286/.
Full textNtakumba, Stanley Sixolile. "The hydrogeomorphology of the Featherstone Kloof Catchment." Thesis, Rhodes University, 2013. http://hdl.handle.net/10962/d1007862.
Full textKMBT_363
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Namde, Noubassem Nanas 1955. "Simulation of micro catchment water harvesting systems." Diss., The University of Arizona, 1987. http://hdl.handle.net/10150/191121.
Full textPERICO, ROBERTA. "GROUNDWATER-SURFACE WATER INTERACTION IN ALPINE CATCHMENT." Doctoral thesis, Università degli Studi di Milano-Bicocca, 2022. http://hdl.handle.net/10281/374727.
Full textThe recognized evidence of global warming demands assessment of the present and future water cycle in Europe and worldwide. Recently, evidence of modified hydrological regime in the Alps under climate change has been documented. However, according to the IPCC Fifth Assessment Report, it is still necessary to deepen our understanding of the impact of climate change and land use on groundwater storage in the alpine catchment areas. A major limitation to the analysis of the surface water-groundwater interaction in alpine terrain are the difficultly of data acquisition as well as the limited presence of meteorological stations. These two factors considerably increase the uncertainty of a holistic representation of the hydrological processes and a reliable estimation of groundwater recharge. The aim of this research work is to improve the current knowledge on the interaction between surface water and shallow aquifers and to define a method for an integrated modelling of the main components of the water cycle at the catchment scale to be used as input for groundwater modelling. The collection and use of data and methods that allow for the maximum discretisation of the heterogeneity of the elements involved is the guiding thread of this work. The scientific approach is demonstrated for a complex case study, the Valtellina valley (northern Italy), to investigate the interaction among the components of hydrogeologic cycle and their future projections according to climate dynamics. This valley could be considered a perfect case study because it is characterized by an active system that rapidly reacts to meteorological and climatic variations. This is visible by the fluctuation of the groundwater and of the main river, Adda River, during extreme precipitation events and with snow melts during the spring/summer periods. The thesis is divided into three main sections. The first provides a description of hydro-stratigraphy of the Valtellina valley floodplain. This section includes the groundwater flow model in a steady state condition, developed by using FeFlow 7.2, and the relative automatic calibration process for the hydrogeologic parametrization. 5 The second shows the quantification of seasonal groundwater storage volume according to the residual water budget method for two hydrologic years. For the estimation of the main components (Precipitation, Evapotranspiration and Snow water equivalent), new promising satellite-based database and methods are tested. The last one describes the tranFinally, the flow model has been used to evaluate the impact on groundwater of possible climate change scenarios.sient groundwater flow model developed with dynamic boundary conditions obtained from satellite-based methods.
Sabetraftar, Karim, and Karim Sabetraftar@anu edu au. "The hydrological flux of organic carbon at the catchment scale: a case study in the Cotter River catchment, Australia." The Australian National University. Centre for Resource and Environmental Studies, 2005. http://thesis.anu.edu.au./public/adt-ANU20070502.141450.
Full textShadeed, Sameer. "Up to date hydrological modeling in arid and semi-arid catchment, the case of Faria catchment, West Bank, Palestine." [S.l. : s.n.], 2008. http://nbn-resolving.de/urn:nbn:de:bsz:25-opus-54205.
Full textSabetraftar, Karim. "The hydrological flux of organic carbon at the catchment scale : a case study in the Cotter River Catchment, Australia /." View thesis entry in Australian Digital Theses Program, 2005. http://thesis.anu.edu.au/public/adt-ANU20070502.141450/index.html.
Full textBroxton, Patrick. "UNDERSTANDING THE IMPORTANCE OF ASPECT ON MOUNTAIN CATCHMENT HYDROLOGY: A CASE STUDY IN THE VALLES CALDERA, NM." Thesis, The University of Arizona, 2008. http://hdl.handle.net/10150/193452.
Full textLaceby, John Patrick. "The Provenance of Sediment in Three Rural Catchments in South East Queensland, Australia." Thesis, Griffith University, 2012. http://hdl.handle.net/10072/367963.
Full textThesis (PhD Doctorate)
Doctor of Philosophy (PhD)
Griffith School of Environment
Science, Environment, Engineering and Technology
Full Text
Rodger, Jessica Ruth. "Intraspecific genetic, morphological and life history structuring of brown trout (Salmo trutta) in a single complex catchment, the Foyle catchment." Thesis, University of Glasgow, 2017. http://theses.gla.ac.uk/8522/.
Full textMandlazi, Nompumelelo Pretty. "Hydrological Characterisation of Wetlands: Understanding wetlands-catchment linkages." University of the Western Cape, 2017. http://hdl.handle.net/11394/5877.
Full textThis study explores the hydrological processes of selected wetlands in four different catchments in South Africa (the Nuwejaars River in the Western Cape which has the Elandsdrift-Wiesdrift wetland; the Mohlapetsi river in the lower Olifants river in Limpopo where the GaMampa wetland is located; the Usuthu River in Mpumalanga which has the Bonnie Brook wetlands; and the UMgeni River in KwaZulu Natal with the Lions river wetlands). The representation of wetlands processes in the Pitman and Agricultural Catchments Research Unit (ACRU) - commonly used hydrological models in Southern Africa - is also evaluated. In the Nuwejaars river catchment, hydrological processes were monitored for over a year, while literature and available conceptual frameworks were used in the other catchments. The Pitman and ACRU models were used to represent the main process and to determine how wetlands influence catchment-scale processes. Current understanding of the hydrology of Elandsdrift-Wiesdrift floodplain suggests that the floodplain is dominated by precipitation, overland flow from the catchment area of the floodplain, evapotranspiration, and surface flow from the left sides of the floodplain to the Nuwejaars River. In the Mohlapetsi River catchment the GaMampa wetland is dominated by local rainfall falling directly onto the wetland, surface runoff from the valley sides, and spring flow at the bottom of the surrounding hills occasioned by recharge on the hills, evapotranspiration and lateral flow between the wetland to the river. The Bonnie Brook and Lion's river catchment are valley bottom floodplains dominated by evapotranspiration, precipitation, overland flow, overbank flooding, groundwater discharge and groundwater recharge. Hydrological modelling of wetlands in the four basins yielded reasonable success (Nash Sutcliffe (NSE) ranged from 0.510 to 0.75 with less than 15% percentage of different between observed and selected mean values (PBIAS). Most characteristics of the observed flows for the four catchments were satisfactorily simulated. The overall results from both models indicate that the models can reasonably represent hydrological processes of wetlands, though there is need to improve the routines in both models. Therefore, further studies that will focus on parameter estimation and improving the current wetland modules of both models are recommended.
Newham, Lachlan Thomas Hopkins, and lachlan newham@anu edu au. "Catchment Scale Modelling of Water Quality and Quantity." The Australian National University. Centre for Resource and Environmental Studies, 2002. http://thesis.anu.edu.au./public/adt-ANU20050919.144548.
Full textSchlapp, Julia Emily, and julia schlapp@rmit edu au. "Modelling Fertiliser Use in the Glenelg Hopkins Catchment." RMIT University. Mathematics and Geospatial Science, 2009. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20090602.144534.
Full textRiveros-Iregui, Diego Andres. "Hydrologic-carbon cycle linkages in a subalpine catchment." Thesis, Montana State University, 2008. http://etd.lib.montana.edu/etd/2008/riveros-iregui/Riveros-IreguiD1208.pdf.
Full textHill, P. I. "Extreme flood estimation for the Onkaparinga River Catchment /." Title page, contents and abstract only, 1993. http://web4.library.adelaide.edu.au/theses/09ENS/o9ensh647.pdf.
Full textTsegaw, Aynalem Tassachew. "Short term Distributed Hydrological Modelling of Gaula Catchment." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for vann- og miljøteknikk, 2010. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-12597.
Full textWicks, Jonathan Mark. "Physically-based mathematical modelling of catchment sediment yield." Thesis, University of Newcastle Upon Tyne, 1988. http://hdl.handle.net/10443/152.
Full textHyde, Michael L. "Urban runoff quality in the River Sowe catchment." Thesis, Coventry University, 2006. http://curve.coventry.ac.uk/open/items/9c34fa51-7611-4362-844d-30d87ba84205/1.
Full textBirkinshaw, Stephen J. "Nitrate transport component for SHETRAN catchment modelling system." Thesis, University of Newcastle Upon Tyne, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.336759.
Full textCoulthard, Thomas James. "Modelling upland catchment response to Holocene environmental change." Thesis, University of Leeds, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.364900.
Full textWood, K. A. "Swan-plant interactions in a chalk river catchment." Thesis, Bournemouth University, 2012. http://eprints.bournemouth.ac.uk/20761/.
Full textHowes, S. "A mathematical hydrological model for the ungauged catchment." Thesis, University of Bristol, 1985. http://hdl.handle.net/1983/1affdf54-f3d2-4dbe-83b0-836695ef0c8e.
Full textDondo, C. "Bayesian networks for spatio-temporal integrated catchment assessment." Doctoral thesis, University of Cape Town, 2010. http://hdl.handle.net/11427/10327.
Full textIncludes bibliographical references (leaves 181-203).
In this thesis, a methodology for integrated catchment water resources assessment using Bayesian Networks was developed. A custom made software application that combines Bayesian Networks with GIS was used to facilitate data pre-processing and spatial modelling. Dynamic Bayesian Networks were implemented in the software for time-series modelling.
Yu, Mengran. "Approaches for investigating wildfire impacts on catchment hydrology." Thesis, The University of Sydney, 2018. http://hdl.handle.net/2123/20565.
Full textLee, Lisa Yu-Ting. "EFFICIENT WATER ALLOCATION IN A HETEROGENEOUS CATCHMENT SETTING." Thesis, The University of Sydney, 2007. http://hdl.handle.net/2123/2466.
Full textLee, Lisa Yu-Ting. "EFFICIENT WATER ALLOCATION IN A HETEROGENEOUS CATCHMENT SETTING." University of Sydney, 2007. http://hdl.handle.net/2123/2466.
Full textThe problem of water scarcity has become one of the most controversial topics in Australia over the past decades, with particular focus being the ‘sustainable’ allocation of water between extractive and environmental purposes. Geographical factors are defining the extreme variability in climate and water supply in Australia and, in the past, this was used as a rationale for the construction of large irrigation projects to deliver water to rural, urban, and industrial users. During this ‘expansionary’ phase of Australia’s water use sector, the cost of augmenting supply was relatively low and environmental considerations were secondary to the development imperative. As a result, water resources became over-allocated for extractive uses spurred on by consistent underpricing of water, which indicated a failure to reflect the true cost of water supply. As Australia’s water economy entered a ‘mature’ phase, it was no longer possible to increase supply cheaply as the most easily accessible water resources had already been captured. This was followed by widespread environmental degradation manifested in the Murray- Darling Basin, the nation’s largest river basin which hosts much of Australia’s agricultural production. Consequently, the focus shifted towards demand management, leading to a myriad of regulation aimed at increasing the allocative efficiency of scarce water resources. Towards this end, substantial government funding was injected into the various initiatives throughout the water reform process. Despite the on-going government activities in the area of water reform, the understanding of the actual economic impact and environmental outcomes of various water policies in practice remains limited. In the absence of such understanding, the effectiveness of various government water initiatives is ambiguous and inevitably compromised. The present study addresses this knowledge gap by establishing a method for evaluating the economic and environmental outcomes of environmentally-oriented polices that affect irrigated industries in a catchment. The method is based on an integrated biophysical and economic modelling approach, which enables spatial relationships to be captured accurately allowing a more realistic analysis. Information generated from a computer based biophysical simulation model form the basis of an economic optimisation model with constraints pertaining to environmental targets and water supply limits. The economic model consists of a linear programming and dynamic programming component, and involves the optimisation of resource use from a catchment manager’s perspective, seeking to achieve efficient resource use but at the same time conform to given environmental objectives. This embedded linear and dynamic programming approach was required to determine the optimal intra-seasonal and inter-seasonal water allocation, given various catchment environmental targets. The interdisciplinary approach enables the economic and ecological outcomes of the catchment management policies to be simulated and assessed at a spatially explicit scale, due to the link to Geographical Information Systems (GIS) in the biophysical model. The overall objective was to create a decision-making framework that could be used to determine the least-cost means of meeting environmental targets and resource constraints. The solutions to the analysis are directly applicable to the case study, the Mooki catchment in northern New South Wales (NSW), but with an adaptable framework that can be applied to other catchments. Specific objectives include an evaluation of the possibility of using alternative irrigation systems, as well as an evaluation of the benefits that can be realised by establishing water market, in the light of environmentally-oriented catchment policies for the case study. The economic cost of achieving environmental targets pertaining to environmental flow requirements and salinity reduction, in the form of end-of-valley salinity targets, was explicitly calculated through the economic model. While salinity targets have been set for NSW catchments, the practicality of such targets is in question, given the substantial reductions in water allocation to irrigation activities, which is one of the key contributors to deep-drainage. An additional objective in this study was therefore to investigate the value of having deep drainage targets. A further consideration is the effect of “external agents” in the form of government plans to buyback entitlements from irrigation districts, or the possibility of significant water rights purchases from mining industries. The implications of external water market entrants on the regional agricultural industry were examined.
Fox, Neil Ian. "Estimation of catchment flood potential using satellite data." Thesis, University of Salford, 1998. http://usir.salford.ac.uk/42989/.
Full textCarrillo, Soto Gustavo Adolfo. "Catchment Similarity of Hydrologic Partitioning Along Climate Gradients." Diss., The University of Arizona, 2012. http://hdl.handle.net/10150/242371.
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