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[1]QU Yongjian,CHENG Xiangrong,YU Mukui,et al.Study on Runoff Responses to Land Use Changes in Qujiang Basin Using SWAT Model[J].Research of Soil and Water Conservation,2019,26(01):130-134.

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Study on Runoff Responses to Land Use Changes in Qujiang Basin Using SWAT Model

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 26 Number of periods: 2019 01 Page number: 130-134 Column: Public date: 2019-02-28

Title:: Study on Runoff Responses to Land Use Changes in Qujiang Basin Using SWAT Model

Author(s):: QU Yongjian^1,2, CHENG Xiangrong¹, YU Mukui¹, WU Chuping³, YUAN Weigao³; 1. Research Institute of Subtropical Forestry, CAS, Hangzhou 311400, China;
2. College of Forestry, Henan Agricultural University, Zhengzhou, 450002, China;
3. Zhejiang Academy of Forestry, Hangzhou 310023, China

Keywords:: land use change; SWAT model; runoff; water balance

CLC:: P334⁺92

DOI:: -

Abstract:: This study selected Qujiang Basin as the site. Some data of vegetation, climate, soil, hydrology and map in this basin were collected, and SWAT (Soil and Water Assessment Tool) model of Qujiang Basin was established based on ArcGIS 10.3. The results showed that the simulated monthly runoff values of calibration and validation periods were good in accordance with actual values in Qujiang Basin, the correlation coefficient of the simulated and the measured values was great than 0.83 and the Nash coefficient (E_ns) was greater than 0.69; from 2000 to 2015, forestland and farmland were the main land use types in Qujiang Basin, which accounted for about 98% of the total area of the basin, and the other land use types were less than 2%; during the study period, the area of construction land significantly increased, and the other land use types less changed; the trend of monthly runoff variation was similar for land use scenarios of 2000, 2005, 2010 and 2015; the annual runoff in 2015 increased by 0.27% compared with 2000, and the difference in water balance components varied from 1.1 mm to 3.8 mm in the four phases of land use scenarios; the simulated different scenarios found that the area of grassland in the basin was small, and the conversion of grassland to forestland had little impact on surface runoff and water balance. After farmland was converted to forestland, and the surface runoff was reduced by 15.0% compared to the current land use model, and deep water leakage increased by 5.7%. Therefore, minor changes in land use patterns during 2000-2015 would not significantly affect the runoff and water balance in the Qujiang Basin. The increase in forest area in the study area will further reduce surface runoff, and increase deep percolation, and recharge groundwater.

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