Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 35 for “"Sub catchment"”.
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Challenges of regional hydrological modelling in the Elbe River basin : investigations about model fidelity on sub-catchment level
… of high model fidelity even for smaller sub-basins. Usually, the quality of the simulations is lower at inner points than at the outlet. Four research paper chapters and the discussion chapter deal with the reasons for local model deviations and the problem of optimal spatial calibration. …
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Geochemistry of the fynbos ecosystem in a Table Mountain Group sub catchment of the Olifants River, Western Cape, South Africa
… of the Peninsula Formation and the Nardouw Subgroup, folded beneath the central valley.
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Reduction of pollution levels in the Chatty River through Sustainable Drainage Systems: A case study of the Bethelsdorp River sub-catchment
… Canal and the Markman Canal. The Chatty River Catchment is mainly occupied by low-income residential areas resulting in pollution from stormwater runoff, litter, and raw sewage discharge. There are growing informal settlements and limited agriculture. In recent years, the high pollution level …
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Towards applied modeling of the human-eco-system an approach of hydrology based integrated modeling of a semi-arid sub-catchment in rural north-west India
… land use development the 512 km2 large catchment of the Mod river in Jhabua, Madhya Pradesh, India has been chosen. It is characterized by a setting of common problems of peripheral rural semi-arid human-eco-systems with intensive agriculture, deforestation, droughts and general hardship …
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Differentiated use and value of river and riparian ecosystem services and local perspectives on future safeguarding: A case study of the upper Mutale sub-catchment, Limpopo River Basin, South Africa
Over the past five decades, human-driven changes in natural ecosystems have resulted in biodiversity loss and a decline in ecosystem services, particularly affecting freshwater ecosystems. The response to these challenges has led to the adoption of nature-based solutions, emphasizing the …
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Rural Land Management Impacts on Catchment Scale Flood Risk
… and streamflow. Upscaling these effects to the catchment scale continues to be problematic,both conceptually and, more importantly, methodologically. Conceptually, upscaling is critical. As land management may impact upon the relative timing as well as the magnitude of runoff, any changes in …
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Andean sediment response to natural and anthropogenic changes at the catchment scale
… nexus, particularly in glacier-fed mountainous catchments. Soil erosion, driven by both natural and anthropogenic activities, further exacerbates the challenge for resource security. Soil erosion is contributing to increased levels of sediment in river systems threatening crucial river …
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Clay movement in a saline-sodic soil toposequence
In the Herrmanns sub-catchment in the Mt. Lofty Ranges (near Mt. Torrens) soil sodicity was the dominant factor in causing clay to disperse in the eroded area along the foot slopes, wheras in non-eroded areas of the mid-slopes and on the stream banks, the dispersive power of sodicity was attenuated …
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Investigating Subsurface Flow Delivery to a Small High Arctic River
… Two locations of persistent preferential subsurface inputs were observed over a 200 m section the study reach, one at the outlet of a previously active channel through the floodplain, and another at the outlet of a channelized sub-catchment. During baseflow, these inputs provided …
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Ecology and biogeochemistry of fluvial microphytobenthic communities on soft sediments
… spatial scales within the Hampshire Avon river catchment, south England. Across three contrasting sub-catchment geology types - clay, greensand and chalk - algal abundance and composition, algal extracellular organic carbon, bacterial abundance and physical characteristics including organic …
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Testing the efficacy of mitigation measures for reducing fine sediment and associated pollutant delivery to and through rivers in agricultural catchments of England
… (Water Framework Directive 2000/60/EC) and subsequent UK government initiatives such as Catchment Sensitive Farming (CSF) and Demonstration Test Catchments (DTC), aim to improve the quality of freshwaters. The DTC programme aims to find cost-effective ways to reduce agricultural diffuse …
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Effects of seasonal changes on the depletion of microflora in natural wetlands in Northern KwaZulu Natal
… structure of this lake. Lake Cubhu wetland is a sub-catchment within the Mhlatuze catchment and it is surrounded by various small scale farms. Esikhaleni Wastewater Treatment works is also within this sub-catchment and it uses this wetland as its effluent recipient. The analysis of temperature, …
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Impacts of anthropogenic activities on the fisheries of the Don, Rother and Dearne catchments
… and recruitment.The Don, Rother and Dearne catchment in South Yorkshire and North East Derbyshire has suffered from a legacy of pollution and land contamination that dates back to the Industrial Revolution. These rivers have been grossly polluted from industrial, sewage, and mining effluents …
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Modelling the Hydrologic Impact of Land Cover on Stormwater Detention Basins in Harris County, TX
… discharge by simulating detention basins as flat sub catchment using the Environmental Protection Agency’s Storm Water Management Model (EPA SWMM). Five significant rainfall events and annual simulations over a 10-year period (2015–2024) were modeled across ten basins with varying land cover …
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Relationships Between Landscape, Spatial Scale, and Stream Water Chemistry in a Subtropical Karst System
… landscape-water chemistry interactions in a subtropical context, landscape characteristics (natural and anthropogenic) were quantified at three spatial scales (sub-catchment, riparian, stream reach) and related to water chemistry variables collected over a 13-month sampling period. An …
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A nested environmental approach to typhoid epidemiology in Central Division, Fiji
… involve interactions within and between nested subsystems of biological organisation. Typhoid fever is a serious disease threat in the South Pacific region, with Fiji reporting the highest annual number of cases, yet risk factors in this setting have been poorly studied. While localised …
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Some of the ecological effects of a small inter-basin water transfer on the receiving reaches of the upper Berg River, Western Cape
… of water from one geographically isolated river catchment, sub-catchment or river reach, to another. Thus, one river becomes a donor, and another the recipient. They are joined by a range of possible transfer routes. In many cases either or both the donor and recipient rivers are impounded. The …
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Bacteria attenuation modeling and source identification in Kranji Catchment and Reservoir
… to determine the bacterial loading of Kranji Catchment and Reservoir and how this will affect planned recreational use of Kranji Reservoir. Field and laboratory work was conducted in Singapore during the month of January 2009 to characterize the concentration of bacteria at sampling locations …
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Environmental flows for English rivers: a focus on modified catchments
… located across the River Trent and Great Ouse catchments of central England, using a dataset of 48 stations and approximately 1000 station-years. Analyses highlight a variety of ‘ecological drought’ responses, in magnitude, timing and duration, with extreme low flows being rarely observed on …
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Analysis of temporal and spatial changes in major dissolved salts in the Vaal River system over a 40 year period
… salinity composition of the Vaal River and its catchment area was investigated between 1975-2015. Long-term data sets gathered from a 40-year span collected across nine monitoring station in the study catchment area was analysed. The statistical tool applied for the data analysis is the Maucha …
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