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[1]JING Kexing,MAO Huan,SONG Jinxi,et al.Simulation of Runoff in Flood Season and Analysis of Surface Runoff Characteristics in Chabagou Watershed[J].Research of Soil and Water Conservation,2023,30(01):62-69.[doi:10.13869/j.cnki.rswc.2023.01.004]

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Simulation of Runoff in Flood Season and Analysis of Surface Runoff Characteristics in Chabagou Watershed

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 30 Number of periods: 2023 01 Page number: 62-69 Column: Public date: 2023-01-10

Title:: Simulation of Runoff in Flood Season and Analysis of Surface Runoff Characteristics in Chabagou Watershed

Author(s):: JING Kexing^1,2,3, MAO Huan^1,2,3, SONG Jinxi^1,2,3, HUANG Peng^1,2,3, WU Qiong^1,2,3, PANG Guowei^1,2,3; (1.College of Urban and Environment Sciences, Northwest University, Xi'an 710127, China; 2.Shaanxi Key Laboratory of Earth Surface System and Environment Carrying Capacity, Xi'an 710127, China; 3.Yellow River Institute of Shaanxi Province(YRISP), Xi'an 710127, China)

Keywords:: runoff simulation; runoff characteristics; SWAT model; Green-Ampt infiltration method; Chabagou watershed

CLC:: P333.5

DOI:: 10.13869/j.cnki.rswc.2023.01.004

Abstract:: Climate change is an important driving factor affecting the hydrological cycling processes of watershed. In recent years, the frequent occurrence of extreme rainfall-runoff events caused by climate change has posed a serious threat to social and economic development. Therefore, it is urgent to carry out hydrological simulation and runoff characteristics analysis. SWAT(Soil and Water Assessment Tool)is a distributed hydrological model with physical mechanisms and has been widely used to evaluate hydrological processes under changing environments. The Chabagou watershed on the Loess Plateau was taken as the study area, and the daily scale hydrological processes of the Chabagou watershed were simulated by the SWAT model driven by the Green-Ampt infiltration method, which is more suitable for the Loess Plateau. Based on the Hydrological Response Units, the effects of rainfall intensity and soil moisture on runoff yield characteristics of different land covers were analyzed based on the surface runoff yield and surface runoff coefficient of four rainfall-runoff events. The results show that:(1)driven by the Green-Ampt infiltration method, E_NS and R²of SWAT model in calibration and validation period are 0.76 and 0.74, 0.78 and 0.75, respectively; the model can successfully simulate the hydrological process of the watershed at daily scale;(2)the surface runoff coefficients under different land covers all show a significant upward trend with the increase of the maximum rainfall intensity, and increase significantly when the maximum rainfall intensity is greater than 16 mm/h; the largest surface runoff coefficient existed in farmland, followed by pasture and forest;(3)the antecedent soil moisture can reveal the change of the part surface runoff coefficient under the high rainfall intensity, and antecedent soil moisture under different land covers has a good linear relationship with surface runoff coefficient; according to the slope of the fitting equation, the surface runoff coefficients of farmland and pasture are more sensitive to the change of antecedent soil moisture. In conclusion, this study can be informative for daily runoff simulation and analysis of runoff yield characteristics under the variable environmental conditions of loess hilly-gully region.

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Last Update: 2023-01-10