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[1]ZHANG Zhongyang,LYU Mingxia,WANG Yibo,et al.Simulation and Space Driving Force Analysis of Soil Erosion and Sediment Production in Taohe Source Area Based on WaTEM/SEDEM Model[J].Research of Soil and Water Conservation,2023,30(03):27-36.[doi:10.13869/j.cnki.rswc.2023.03.047]

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Simulation and Space Driving Force Analysis of Soil Erosion and Sediment Production in Taohe Source Area Based on WaTEM/SEDEM Model

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 30 Number of periods: 2023 03 Page number: 27-36 Column: Public date: 2023-04-10

Title:: Simulation and Space Driving Force Analysis of Soil Erosion and Sediment Production in Taohe Source Area Based on WaTEM/SEDEM Model

Author(s):: ZHANG Zhongyang¹, LYU Mingxia¹, WANG Yibo^1,2, MA Zhanghuai¹, GAO Zeyong²; (1.College of Earth and Environment Science, Lanzhou University, Lanzhou 730000, China; 2.State Key Laboratory of Frozen Soil Engineering, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China)

Keywords:: soil erosion; WaTEM/SEDEM model; geographic detector; center of gravity model; source area of Taohe River

CLC:: S157.1

DOI:: 10.13869/j.cnki.rswc.2023.03.047

Abstract:: [Objective]A comprehensive understanding of the spatial and temporal changes of soil erosion at long time scales and its influencing factors is of great significance to soil erosion management. The spatial and temporal change characteristics of soil erosion and sediment production in the watershed from 1998 to 2018 and their spatial driving factors were exploreed to provide scientific theoretical basis for the soil and water management in the Taohe River source area watershed. [Methods] The Taohe River source area watershed was taken as the study area. Based on the measured sediment transport data from Luqu station and vegetation NDVI data, the spatial and temporal variation characteristics of watershed erosion and sediment production were analyzed by the WaTEM/SEDEM model in combination with the center of gravity model, and the spatial driving factors were further explored by using the geographic detector. [Results] The sediment production modulus in the source area of the Taohe River increased from 33.81 t/(hm²·a)in 1998 to 48.59 t/(hm²·a)in 2018. The soil erosion intensity was dominated by slight erosion, followed by extreme intensity and mild erosion, and the proportion of severe, intense and moderate erosion was the smallest. The areas with stronger erosion distributed in the alpine zone. The areas with weaker erosion distributed in the central valley area and the lower elevation area. Topographic grade and vegetation cover within the watershed had the greatest impact on soil erosion, with q values of 0.359 and 0.183, respectively. The erosion modulus of the watershed increased with the increase of the topographic level and decreased with the increase of vegetation cover. In the two periods of 1998—2003 and 2008—2013, the soil erosion gravity center moved to the southeast, in 2003—2008, the erosion gravity center moved to the northwest, and in 2013—2018, it moved to the north. [Conclusion] The erosion of the Taohe River source area watershed as a whole showed a deterioration trend from 1998 to 2018, and its spatial driving forces were mainly the topographic position index and vegetation cover factor. The results of the study indicate that the projects of returning pasture to grass should be vigorously developed and ecological vegetation construction should be actively carried out in the future.

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Last Update: 2023-04-10