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Showing 1 to 20 of 35 for “"stream power"”.
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Limitations on tidal-in-stream power generation in a strait
… the effects of global climate change, tidal-in-stream energy is being investigated as one of many possible sustainable means of generating electricity. In this scheme, turbines are placed in a tidal flow and kinetic energy is extracted. With the goal of producing maximum power, there is an ideal …
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DEVELOPMENT OF DEM-BASED METHOD FOR MAPPING STREAM POWER DISTRIBUTION OF SOUTHERN ONTARIO STREAMS
Mapping of stream power along a stream system, a known determinant of channel form and dynamics, is a valuable component of geomorphic stream assessment procedures that, unlike current methods, is physically-based, time- and cost-effective, objective and repeatable. Continuous maps of stream power …
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Trends in stream power and erosion at a suburban stream in Western New York
Streambank erosion is a highly damaging and prevalent nonpoint source pollution that impacts water quality, flow, and ecology. Urban watersheds are particularly sensitive due to a greater proportion of directly connected impervious land cover resulting in increased runoff into streams. Climate …
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A computational fluid dynamics model for sediment movement based on the unit stream power approach
… numerical model based on the unit stream power approach for the prediction of scour profiles. The unit stream power approach is employed to define the incipient motion criteria for the sediment particles by comparing the available applied stream power with the individual particle …
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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
… shown below. Chapter 2: LEMs often utilize the stream power incision model to simulate river incision: E=KAmSn, where E = vertical incision 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 …
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The role of precipitation on Bedrock Channel Incision in Kauai, HI
… bedrock channels is frequently modeled with the stream power law, which relates erosion rates to drainage area, slope, and an erosional efficiency coefficient k. The value of k, however, varies with many physical factors and most of these relationships are not well quantified. This study uses a …
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Alluvial river response to active tectonics in the Dehradun region, Northwest India: A case study of the Ganga and Yamuna rivers.
… patterns, grain size distribution trends, and stream power in response to active faults. Therefore, river morphology can carry a measurable signature of tectonic activity. Furthermore, it can be hypothesised that fluvial systems are in fact more sensitive to local faulting than raw topographic …
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Stream Instability in Urban Watersheds and its Role in Sediment and Nutrient Loading
… significant changes in flow rate patterns in stream channels within urbanizing watersheds. The increased runoff volume, and increased frequency and magnitude of peak flows resulting from urbanization can cause channel instability, commonly referred to as Urban Stream Syndrome, (Paul and Meyer, …
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Braided rivers: an exploratory study combining flume experiments and the analysis of remotely-sensed data
… and skewness of the bed and also clear downstream trends. Measures of vegetation cover showed statistically-significant associations with the median, standard deviation, kurtosis and skewness of the bed, particularly when only the 32 truly braided reaches were analysed. The measures of …
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Fractional transport of bed-material load in sand-bed channels
… velocity. This function is derived from the unit stream power theory and the concepts of the TCF approach and the bed material fraction (BMF) approach. The second function is in terms of relative diameter. It is derived from the Engelund and Hansen's transport relations and the concepts of the TCF …
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Identifying Locations Of Highly Eroded Agricultural Land In The Devils Lake Basin, ND Using GIS Terrain Analysis Modeling
… The analysis used slope, flow accumulation, and stream power index (SPI) within a GIS to identify highly eroded areas. The study found that 1.5% of the 262.8 km2 study area exhibited channelized erosion. It was determined that the terrain analysis accurately identified 92 (79%) of the 116 survey …
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Geomorphic modeling and routing improvements for GIS-based watershed assessment in arid regions.
… of event-based hydrologic models for ephemeral stream networks declines significantly as watershed size increases. The second is that no single model is capable of simulating runoff, erosion, and geomorphic response in the channel network for multiple consecutive events. A diffusion-wave routing …
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Equilibrium and transient morphologies of river networks : discriminating among fluvial erosion
… slope and mean grain size usually decrease downstream. These variables play an important role in determining sediment transport rates, and their mutual adjustment to a change in the forces that drive erosion can yield surprising results. Adjustments in grain size can lead to spatially variable …
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Wetland landscape dynamics and its socio-ecological implications
… the compound topographic index (CTI) and the stream power index (SPI) generated from the United States Geological Survey (USGS) digital elevation model (DEM). The third part involved metric calculations, which were implemented based on the spatial patterning of the structure of landscape …
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Generation of Buried Transient Landscapes and Residual Depth Anomalies
… arranged within catchment areas. Applying the stream power law, longitudinal river profiles are inverted to calculate spatially and temporally varying uplift histories. These unique landscapes are attributed to laterally advecting pulses of hot material that travel away from the centre of the …
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Modeling Soil Erosion in the Upper Green River, KY
… practices and leading to sedimentation downstream and downwind, a decrease in the transport capacity of streams, increase in the risk of flooding, filling reservoirs, and eutrophication. A primary focus in examining the problems associated with soil erosion arid ultimately in proposing …
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Classifying Single-thread Rivers: A European perspective
… expected gradients in two controlling variables: stream power and bed sediment calibre. Thirdly, bar theory was applied to a sample of rivers representative of the six classes. Since bars are an important contributor to river channel form and dynamics, the correspondence of the bars in the six …
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Morphodynamics of large anabranching rivers : the case of the Madeira River, Brazil
… three reaches: 1) Box-shaped channels with upstream and downstream anabranching structures; 2) A pseudo-meander with a downstream anabranching structure; 3) A single-threaded straight channel with a downstream anabranching structure. The analysis of the spatial-temporal channel changes of the …
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Downstream change in channel hydraulics along the River Severn, UK
An understanding of the longstream distribution of hydraulic processes is important for evaluating the mechanisms which control the catchment-scale variation of channel stability, sediment transport and siltation, flood generation and aquatic habitats. However, little attention has been given to …
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The Geomorphic Effects of Native and Invasive Riparian Vegetation: Sprague River, Oregon
Numerous studies have addressed the role of stream geomorphology on vegetation distribution. These studies have shown that channel morphology, including depositional and erosional processes, influence vegetation colonization. However, few studies have addressed the impact of vegetation on the …
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