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[1]Wang Huiyuan,Song Jinxi,Wu Qiong.Comprehensive Evaluation of Water Source Conservation Function in the Bahe River Basin at the Northern Foot of Qinling Mountains Based on SWAT Model[J].Research of Soil and Water Conservation,2023,30(06):307-315.[doi:10.13869/j.cnki.rswc.2023.06.030]

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Comprehensive Evaluation of Water Source Conservation Function in the Bahe River Basin at the Northern Foot of Qinling Mountains Based on SWAT Model

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 30 Number of periods: 2023 06 Page number: 307-315 Column: Public date: 2023-10-10

Title:: Comprehensive Evaluation of Water Source Conservation Function in the Bahe River Basin at the Northern Foot of Qinling Mountains Based on SWAT Model

Author(s):: Wang Huiyuan^1,2, Song Jinxi^1,2,3, Wu Qiong^1,2; (1.College of Urban and Environmental Sciences, Northwest University, Xi'an 710127, China; 2.Shaanxi Key Laboratory of Earth Surface System and Environmental Carrying Capacity, Xi'an 710127, China; 3.Institute of Qinling Mountains, Northwest University, Xi'an 710127, China)

Keywords:: Bahe River Basin; water conservation amount; water conservation function; SWAT model; vegetation net primary productivity

CLC:: S714.7

DOI:: 10.13869/j.cnki.rswc.2023.06.030

Abstract:: [Objective] The aims of this study are to accurately understand the connotation of water conservation function and improve the rationality of the calculation results of water conservation function. [Methods] The Bahe River Basin at the northern foot of the Qinling Mountains was selected as the research area, and the SWAT model was used. Based on the water balance method, a quantitative calculation formula for water conservation was established, and the evolution law of water conservation in the Bahe Basin in the past 59 years was analyzed. At the same time, a new comprehensive evaluation method of water conservation function was proposed. Based on the water carbon cycle of the ecosystem as the theoretical basis for the evaluation of water conservation function, and the ratio of water conservation amount to NPP(net primary productivity of vegetation)as the quantitative evaluation index of water conservation function, the evolution law and spatial pattern of water conservation function in the Bahe River Basin in the past 18 years were analyzed. [Results](1)The seasonal rate setting was better than the whole series rate setting, and the new method could improve the model flow simulation results.(2)In the past 59 years, the inter-annual water conservation in the Bahe River Basin had shown a downward trend, and the change rate was k=-1.4 mm/a. The Mann-Kendall nonparametric statistical method was used. The annual water conservation had shown a significant downward trend since 2013. Morlet Wavelet analysis of the anomalous time series data of annual water conservation in the Bahe River Basin showed that the change period of water conservation under the main cycle of 35 years was about 23 years.(3)In the past 18 years, the inter-annual variation of the water conservation function in the Bahe River Basin had generally shown a decreasing trend, with an interannual variation rate of -0.013 5 mm/g. The spatial performance of the water conservation function was that with the increase of the slope, the conservation function enhanced. [Conclusion] Seasonal calibration can improve the flow simulation results of SWAT model, and the water conservation function of the Bahe River Basin has shown a downward trend in recent years.

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Last Update: 2023-10-10