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 26 for “"Drainage Networks"”.
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Evolution of chemical composition along river drainage networks
… nutrients (N and P) show little change along the drainage network.</p><p>Sampling of tributaries and source points at high and low elevation within the uniform intrusive bedrock of the Icacos was undertaken to identify spatial variability in weathering processes. Landslides are frequent in the …
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Using Accumulation Based Network Identification Methods to Identify Hill Slope Scale Drainage Networks in a Raster GIS
… criticized for producing a spatially uniform drainage density (Tarboton 2002) at the watershed scale. This criticism casts doubt on the use of ANIMs for deriving properties such as overland flow length for nonpoint source pollution models, without calibrating the accumulation threshold value. …
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Effects of differential rainfall on the dynamics of landscape evolution
… Discharge is dependent on the structure of the drainage network in the landscape. Therefore, it is important to understand drainage networks in order to understand how landscapes evolve. Dendritic drainage networks are the most general form that exists in the environment. Some researchers …
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Prediction of stream channel location from drainage basin boundaries
Common methods of extracting representations of drainage networks from raster digital elevation models for hydrological and geomorphological applications are similar to a class of image processing methods known as grayscale watershed algorithms. These algorithms partition a field of scalar values …
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The effect of rainstorm movement on urban drainage network runoff hydrographs
… and storm sizes. The configuration of the drainage network is simulated with Gibbs’ model. The peak response is investigated with different rainstorm conditions and network configurations. The results show that the effect of the direction and speed of the rainstorm movement significantly …
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Expressions of Mantle Dynamics in Landscapes and Sedimentary Basins
… of uplift are not well constrained. Fluvial drainage networks appear to contain quantitative information about the spatial and temporal evolution of continental topography. Such information is extracted from Anatolian drainage networks using an inverse modelling approach. Separately, …
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Assessing the use of exfiltration pervious pavements as a best management practice for storm water management for Lusaka urban
… best management practice can be integrated with drainage networks for Lusaka urban to reduce floods ensuing from developments. The system will mimic natural environments which allow infiltration of stormwater to potentially contribute to groundwater. Key words: Stormwater, Best management …
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Overcoming unrealistic behavior of landscape evolution models attributed to the stream power incision model: Scale invariance and ultra-sensitivity to initial conditions
… rate, K = erodibility constant, A = upstream drainage area, S = channel gradient, and m and n are exponents. This simple but useful law has been employed with an imposed rock uplift rate to gain insight into steady-state landscapes. The most common choice of exponents satisfies m/n = 0.5. Yet …
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Biogeochemical heterogeneity in the salt marsh pools of the north Norfolk coast
… coastal pools. It is postulated that the marsh drainage networks, and therefore the number, area and geochemistry of pools, may change with future climate change and anthropogenic marsh use. The capability of coastal marshes to capture and store atmospheric carbon may then be altered.
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Flow Dynamics in Large River Basins: Self -Similar Network Structure and Scale Effects
… The geomorphologic characteristics of the drainage networks for the study basins were obtained from DEMs. The river networks were extracted from both 30 m and 3 arc-second DEMs and compared to those obtained from the national hydrographic dataset (NHD). The effect of hillslope dynamics on …
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Seasonal and interannual variability in the hydrology and geochemistry of an outlet glacier of the Greenland Ice Sheet
… channelized and inefficient distributed drainage systems. Distributed system drainage is a key component in stabilizing GrIS velocity on interannual time scales and controlling geochemical fluxes. During the spring and summer of 2011 and 2012, I conducted fieldwork at a large outlet …
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Third landscapes for flood-resilience: Rethinking scales of green infrastructure in neighborhoods in Khulna, Bangladesh
… an inadequate and not well-functioned drainage system, poor waste management, and lack of integrated planning for making the city flood-resilient have increased the impacts and suffering due to flooding (Rahman, M. Mujibor, et al., 2009; Feasibility Study in Khulna Including Climate …
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Seasonal and interannual variability in the hydrology and geochemistry of an outlet glacier of the Greenland Ice Sheet
… channelized and inefficient distributed drainage systems. Distributed system drainage is a key component in stabilizing GrIS velocity on interannual time scales and controlling geochemical fluxes. During the spring and summer of 2011 and 2012, I conducted fieldwork at a large outlet …
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Assessing the dynamics of soil erosion and sediment transport under increasing land use pressures in East African Rift Catchments
… downstream by strongly connected ephemeral drainage networks. Increasing land use pressures are the major driver for the upstream exponential increase in sediment yield. However, on the basin scale, rainfall dynamics and sediment connectivity are important factors for explaining observed …
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Observations of Dynamic Topography from South American Atlantic Margin
… uplift is studied by inverse modeling of drainage networks, which provides spatial and temporal uplift patterns. The temporal evolution of this region is also analysed by geochemistry of intraplate magmatic rocks and earthquake tomography. Relationships between long-wavelength topography, …
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Modelling the propagation of subglacial floods
… the extent of its incorporation into existing drainage networks determines the response of the ice. As a result, modelling of subglacial flooding is both necessary for understanding the detailed dynamics of glaciers responding to meltwater and also a useful test case for investigating the …
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Application of Morphometric Relationships to Active Flow Networks Within the Mammoth Cave Watershed
… formulated to describe the nature of surface-drainage networks. These parameters have been used in various studies of geomorphology and surface-water hydrology, such as flood characteristics, sediment yield, and evolution of basin morphology. Little progress has been made in applying these …
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Analysis and visualisation of digital elevation data for catchment management
… flow accumulation threshold to delineate channel networks in the study catchment. These results were then used to quantitatively compare the positional accuracy of drainage networks derived from different DEMs. The final part of the thesis conducted an assessment of soil erosion and diffuse …
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Global Analysis of Predicted and Observed Dynamic Topography
… in the east. Calibrated inverse modelling of drainage networks suggest that the tilt of the peninsula grew principally in Neogene times with vertical motions linked to asthenospheric temperature anomalies. Uplift rates of up to 0.1 mm a$^{-1}$ place important constraints on the spatio-temporal …
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