Topic
Stream power
About: Stream power is a research topic. Over the lifetime, 1135 publications have been published within this topic receiving 51324 citations.
Papers published on a yearly basis
Papers
More filters
TL;DR: In this article, the authors investigated the pros and cons of six popular sediment transport capacity (STC) methods (namely, Shear velocity, Kilinc-Richardson (KR), Effective stream power, Slope and unit discharge, Englund-Hansen (EH), and Unit stream power) for soil erosion/deposition simulation at watershed scales.
Abstract: Estimation of sediment transport capacity (STC) plays a crucial role in simulating soil erosion using any physics-based models. In this research, we aim to investigate the pros and cons of six popular STC methods (namely, Shear velocity, Kilinc-Richardson (KR), Effective stream power, Slope and unit discharge, Englund-Hansen (EH), and Unit stream power) for soil erosion/deposition simulation at watershed scales. An in-depth analysis was performed using the selected STC methods integrated into the Grid Surface Subsurface Hydrologic Analysis model for investigating the changes in morphology at spatial-temporal scales at the Cheoncheon watershed, South Korea, over three storm events. Conclusions were drawn as follows. (1) Due to the ability of the KR and EH methods to include an additional parameter (i.e., erodibility coefficient), they outperformed others by producing more accurate simulation results of sediment concentration predictions. The KR method also proved to be superior to the EH method when it showed a more suitable for sediment concentration simulations with a wide range of sediment size and forcing magnitude. (2) We further selected 2 STC methods among the 6 methods to deeply explore the spatial distribution of erosion/deposition. The overall results were more agreeable. For instance, the phenomenon of erosion mainly occurred upstream of watersheds with steep slopes and unbalanced initial sediment concentrations, whereas deposition typically appeared at locations with flat terrain (or along the mainstream). The EH method demonstrated the influence of topography (e.g., gradient slope) on accretionary erosion/deposition results more significantly than the KR method. The obtained results contribute a new understanding of rainfall-sediment-runoff processes and provide fundamental plans for soil conservation in watersheds.
2 citations
TL;DR: In this article , the authors used a numerical model to simulate the flow of a single overtopping event over a flood defence with a grass-covered crest and landward slope.
2 citations
Journal Article•
TL;DR: In this article, the authors analyzed the soil detachment rate in a loess region under the large range of flow discharge (0.5~2.0 L/s) and slope gradient (8.8%~46.6%).
Abstract: Quantitative simulation on soil detachment rate is the base of process-based soil erosion model development. This study was conducted to analysis hydro-dynamic mechanism of soil detachment process for original soil core in loess region under the large range of flow discharge (0.5~2.0 L/s) and slope gradient (8.8%~46.6%). The results indicated that detachment rate of disturbed soil is more greater than that of original undisturbed soil caused by the disturbance of soil structure. It is necessary to use original undisturbed soil to investigate the mechanism of soil detachment and soil erosion. Soil detachment rate increased with both flow discharge and slope gradient increasing. However, the regression equations were slightly different between each other. Soil detachment rate can be simulated with power function of flow discharge and slope gradient (R~2=0.95). Due to the influence of sediment transport and soil sample disturbance, erodibility parameter of current study was significantly different with the relative results obtained from disturbed soil samples. Therefore, it is necessary to use original soil sample to simulate soil erosion mechanism. Among three current used hydro-dynamic parameters of shear stress, unit stream power, and stream power, there was closely relationship between soil detachment rate and stream power.
2 citations
TL;DR: In this article, a field experiment was conducted on debris flow deposits in the valley of the Jiangjiagou Ravine, a tributary of the Yangtze River in southwestern China, to study the evolution and distribution of bed structures and their relationship with environmental conditions.
Abstract: Bed structures in many mountain rivers provide additional resistance to the flow. A field experiment was conducted on debris flow deposits in the valley of the Jiangjiagou Ravine, a tributary of the Yangtze River in southwestern China, to study the evolution and distribution of bed structures and their relationship with environmental conditions. Water and sediment from the Jiangjiagou main stream were diverted into the experimental channel. Several hydrological schemes were adopted to scour the channel until equilibrium was reached. During this process the evolutions of bed structures and channel configuration were investigated. The results indicate that stronger bed structures mean greater stream power consumption, greater resistance, and greater slope in a certain section when rivers are in dynamic equilibrium. Thus, to some extent the longitudinal profiles of channels can be determined by the distribution of bed structures. In natural cases, the strength and evolution of bed structures are under the influence of environmental conditions such as discharge and bed-load transportation rate. That is, given the same conditions, the same bed structure distribution and longitudinal profile can be predicted.
2 citations
TL;DR: In this paper, the authors used a numerical model to simulate the flow of a single overtopping event over a flood defence with a grass-covered crest and landward slope, showing that the flow velocity, the shear stress and the pressure are maximal at the landward toe and can be used to describe grass erosion by shear forces.
2 citations