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[1]YANG Guang,LU Kexin,LI Peng,et al.Spatial Distribution of Annual Runoff Erosion Power in Qingshuihe River Basin Based on SWAT Model[J].Research of Soil and Water Conservation,2022,29(06):90-96,103.

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Spatial Distribution of Annual Runoff Erosion Power in Qingshuihe River Basin Based on SWAT Model

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 29 Number of periods: 2022 06 Page number: 90-96,103 Column: Public date: 2022-10-20

Title:: Spatial Distribution of Annual Runoff Erosion Power in Qingshuihe River Basin Based on SWAT Model

Author(s):: YANG Guang¹, LU Kexin¹, LI Peng^1,2, LIU Hailiang¹, LIU Guihua¹, CAO Fenghua¹, MA Tianwen¹, WANG Dejun², WEN Miaoxia², SUN Jingmei²; (1.State Key Laboratory of Eco-hydraulics in Northwest Arid Areas Region of China, Xi'an University of Technology, Xi'an 710048, China; 2.Key Laboratory of National Forestry Administration on Ecological Hydrology and Disaster Prevention in Arid Regions, Xi'an University of Technology, Xi'an 710048, China)

Keywords:: Qingshuihe River Basin; SWAT model; annual runoff erosion power; spatial distribution; threshold value

CLC:: P333; S157

DOI:: -

Abstract:: In order to explain the spatial distribution of water erosion in Qingshuihe River Basin from the perspective of energetics, this study chose to focus on the runoff erosion power which can better represent the comprehensive effect of underlying surface conditions, also rainfall and its runoff generated on water erosion is selected. The Qingshuihe River Basin suffering from serious soil and water loss located in the Ningxia Hui Autonomous Region was selected as the object of research in this paper. The SWAT model was constructed to study the spatial distribution characteristics and spatial distribution scale effect of annual runoff erosion power in Qingshuihe River Basin. The results show that:(1)The annual average runoff erosion power in the Qingshuihe River Basin presents a spatial distribution law of ‘larger in tributaries than of that in the main stream, and larger in the east region than of that in the west region';(2)When the control area at the outlet section of the sub-basin is less than 4 000 km², there is a significant power function relationship between the mean-annual runoff erosion power of the sub-basin and the control area at the outlet section of the sub-basin. When the control area at the outlet section of the sub-basin is greater than 4 000 km², the mean-annual runoff erosion power of the sub-basin is stable at about 1.56×10^-5 m⁴/(s·km²);(3)The small watershed with the control area at the outlet section has an area of less than 84.85 km², which located in the upper and middle reaches of the Qingshuihe River, has been selected as the comprehensive ecological harness small watershed, which can achieve a good soil erosion control effect. Therefore, the runoff erosion power has a certain spatial distribution law and has a significant correlation with the catchment area of the watershed. Mastering this law and correlation can provide theoretical support for the ecological governance of the watershed.

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Last Update: 2022-10-20