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[1]WANG Yiran,DING Wenfeng,ZHANG Guanhua.Study on the Impact of Land Use Change on Runoff in Danjiang Watershed Based on SWAT Model[J].Research of Soil and Water Conservation,2022,29(04):62-67+74.

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Study on the Impact of Land Use Change on Runoff in Danjiang Watershed Based on SWAT Model

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 29 Number of periods: 2022 04 Page number: 62-67+74 Column: Public date: 2022-06-20

Title:: Study on the Impact of Land Use Change on Runoff in Danjiang Watershed Based on SWAT Model

Author(s):: WANG Yiran^1,2, DING Wenfeng^1,2, ZHANG Guanhua^1,2; (1.Changjiang River Scientific Research Institute, Changjiang River Scientific Research Institute, Changjiang Water Resources Committee, Wuhan 430010, China; 2.Research Center on Mountain Torrent & Geologic Disaster Prevention, the Ministry of Water Resources, Wuhan 430010, China)

Keywords:: SWAT model; runoff change; land use/cover change; Danjiang River Basin

CLC:: P333; F301.2

DOI:: -

Abstract:: In order to quantitatively analyze the impact of land use type changes on runoff, based on the SWAT model, the land use changes were analyzed in the Danjiang River Basin in the past 20 years, and three different land use scenarios were set up to explore the impact of different land use types on runoff. The results show that the decisive coefficient R² and the Nash efficiency coefficient NS of the SWAT model were 0.8, 0.73 and 0.86, 0.78 in the regular and validation periods, respectively, which were suitable for the runoff simulation in the Danjiang River Basin; from 2000 to 2020, the runoff change caused by land use change in the Danjiang River Basin was -0.18%; in scenario 1, when the forest land and grassland are all turned into cultivated land, the simulated average annual runoff change rate is 61.65%; in scenario 2, when all cultivated land and grassland are converted into forest land, the simulated average annual runoff change rate is -12.69%; in scenario 3, when all cultivated land and forest land are converted into grassland, the simulated annual average runoff change rate is 24.24%; The influence coefficient of cultivated land on runoff depth was 0.26 mm/hm², the influence coefficient of forest land on runoff depth was -13.35 mm/hm², and the influence coefficient of grassland on runoff depth was -0.01 mm/hm². It can be concluded that cultivated land promotes runoff, while grassland and forest land inhibit runoff. In order to maintain the ecological environment of the Danjiang River Basin and enhance the runoff supply of the Danjiang River Basin, cultivated land resources should be developed scientifically.

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Last Update: 2022-06-20