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Spatial distribution of soil erosion and suspended sediment transport rate for Chou-Shui river basin
Chin-Ping Lin Ching-Nuo Chen Yu-Min Wang Chih-Heng Tsai Chang-Tai Tsai 《Journal of Earth System Science》2014,123(7):1517-1539
In this study, a Physiographic Soil Erosion–Deposition Model (PSED) is applied for better management of a watershed. The PSED model can effectively evaluate the key parameters of watershed management: surface runoff discharge, suspended sediment transport rate, quantity of soil erosion, and spatial distribution of soil erosion and deposition. A basin usually contains multiple watersheds. These watersheds may have complex topography and heterogeneous physiographic properties. The PSED model, containing a physiographic rainfall-runoff model and a basin scale erosion–deposition model, can simulate the physical mechanism of the entire erosion process based on a detailed calculation of bed-load transportation, surface soil entrainment, and the deposition mechanism. With the assistance of Geographic Information Systems (GIS), the PSED model can handle and analyze extremely large hydrologic and physiographic datasets and simulate the physical erosion process without the need for simplification. We verified the PSED model using three typhoon events and 40 rainfall events. The application of PSED to Chou-Shui River basin shows that the PSED model can accurately estimate discharge hydrographs, suspended sediment transport rates, and sediment yield. Additionally, we obtained reasonable quantities of soil erosion as well as the spatial distribution of soil erosion and deposition. The results show that the PSED model is capable of calculating spatially distributed soil erosion and suspended sediment transport rates for a basin with multiple watersheds even if these watersheds have complex topography and heterogeneous physiographic properties. 相似文献
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Yang Che-Ming Chang Jui-Ming Hung Chi-Yao Lu Chih-Heng Chao Wei-An Kang Keng-Hao 《Landslides》2022,19(3):637-646
Landslides - Outburst flooding after a landslide dam breach causes global fatalities and devastation. Information on the timing, magnitude, and location of the landslide dam is crucial to hazard... 相似文献
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Estimating sediment deposition volume in a reservoir using the physiographic soil erosion-deposition model 总被引：1，自引：0，他引：1
A traditional way to estimate the amount of sediment deposition in a reservoir is simply based on the variation in the elevation measurements made at different times.In the present study,a physiographic soil erosion-deposition(PSED) model is applied to.Tseng-Wen reservoir watershed to compute the discharge and sediment concentration into the reservoir,and the deposition volume.The PSED model is verified using three storm events and then compared to the historic data recorded at the hydrological stations in the reservoir watershed,which shows close agreement between the simulated and recorded values of the flow discharge into the reservoir and the corresponding sediment yield. The numerical simulation was also conducted for all rainfall events from 1996 to 2001 to estimate the annual sediment deposition volume in the reservoir.Similarly,the simulated result was compared to that obtained from the cross-section elevation measurement.It is found that some measured data points had large uncertainty or were questionable.On the contrary,the model results and the measured data that renders the model credible.Therefore,regardless of the estimation for the flow discharge into the reservoir induced by a single rainfall event,the sediment yield,or the sediment deposition,the PSED model has successfully demonstrated its ability. 相似文献
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The models of physiographic inundation and flood routing for channel network were used in this study to analyse the influence of the Tainan Scientific Base Industrial Park (TSBIP) and Feng-Hua detention ponds on the inundated potential, inundated volume, flood damage, and flood stage of peak flow along the Yen-Shui creek in 2-day flood for the 2-, 10- and 50-year return periods, respectively. The computed results show that the TSBIP detention ponds are able to reduce the inundated area and flood damage. However, the decrease in inundated area is not obvious for the 50-year return-period flood. Construction of the Feng-Hua detention pond resulted in a significant decrease in the flood stage along the Yen-Shui creek in the downstream reach. Moreover, the decrease in peak flow and lag of time-to-peak become increasingly evident in the downstream direction for the 2- and 10-year return-period events. For the 50-year return period, the lag of time-to-peak is not apparent, but the decrease in peak flow is still noticeable. In respect to the performance of detention ponds, the slopes of hydrographs in the rising and recession segments are smoother than those without detention ponds. Meanwhile, the shapes of peak become flatter if the detention ponds are installed. Copyright © 2007 John Wiley & Sons, Ltd. 相似文献
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