变化环境下渭河流域土壤水储量模拟及影响因素分析
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作者单位:

1.西安理工大学;2.中国水利水电科学研究院

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中图分类号:

S152.7

基金项目:

国家自然科学基金项目(面上项目)(52079104,U2040208);陕西省重点研发计划项目(2023-ZDLSF-60).


Simulation of Soil Water Storage and Analysis of Influencing Factors in Weihe River Basin under Changing Environment
Author:
Affiliation:

Xi’an University of Technology

Fund Project:

National Natural Science Foundation of China ( General Project )( 52079104, U2040208 ) ; key R & D Program of Shaanxi Province ( 2023-ZDLSF-60 )

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    摘要:

    随着气候变化和人类活动影响加剧,流域气候和下垫面条件发生改变,准确模拟土壤水分变化过程并分析其影响因素对于地区的水资源管理和植被建设具有重要意义。本研究以黄土高原地区渭河流域为研究对象,基于ABCD水文模型,采用EFAST法分析模型参数敏感性,构建常参数和时变参数模型,比较不同参数模型的径流深和土壤水储量模拟精度,探讨气候变化和植被恢复对渭河流域土壤水储量变化的影响,明确土壤水储量变化的主导因素。结果表明:①土壤水层补给地下水的比例参数c最为敏感,地下水储放系数d、流域实际蒸散发量与土壤蓄水量之和的上限参数b次之,表征土壤完全饱和前径流的倾向性参数a最不敏感;②与ABCD常参数模型相比,时变参数模型将率定期径流深模拟结果的NSE、KGE、R2分别提高了19%、10%、19%,验证期的NSE、KGE、R2分别提高了7%、7%、9%,时变参数模型显著改善了径流深模拟效果;③基于时变参数模型模拟的渭河流域土壤水储量与ERA5-Land●0~100cm土壤水储量的相关关系最强,二者的变化过程基本相同;④不同影响因素对渭河流域土壤水储量变化的影响程度由强到弱依次为潜在蒸散发>降水>NDVI。研究成果为该地区水资源规划和管理、植被建设提供科学依据,也为其他类似地区的土壤水储量研究提供参考。

    Abstract:

    With the intensified influence of climate change and human activities, the climate and underlying surface conditions of the basins have changed. Accurately simulating the process of soil moisture change and analyzing its influencing factors are of great significance for regional water resources management and vegetation construction. In this study, the Weihe River Basin in the Loess Plateau was taken as the research object. Based on the ABCD hydrological model, the EFAST method was used to analyze the parameter sensitivity of the model, and the constant parameter and time-varying parameter models were constructed. The runoff depth and soil water storage simulation accuracy of different parameter models were compared. The effects of climate change and vegetation restoration on soil water storage changes in the Weihe River Basin were discussed, and the dominant factors of soil water storage changes were clarified. The results show that: 1)The proportional parameter of soil water layer recharge groundwater c is the most sensitive, followed by the groundwater storage coefficient d, the upper limit parameter b of the sum of actual evapotranspiration and soil water storage, and the tendency parameter a of runoff before soil is completely saturated is the least sensitive. 2) Compared with the ABCD constant parameter model, the time-varying parameter model increased the values of NSE, KGE, and R2 of the runoff depth simulation results by 19%, 10%, and 19%, respectively, and the NSE, KGE, and R2 of the verification period increased by 7%, 7%, and 9%, respectively. The time-varying parameter model significantly improved the runoff depth simulation results. 3) The correlation between soil water storage and ERA5-Land 0~100cm soil water storage in Weihe River Basin based on time-varying parameter model simulation is the strongest, and the change process of the two agree well. 4) The degree of different influencing factors on the change of soil water storage in the Weihe River Basin from strong to weak is potential evapotranspiration > precipitation > NDVI. The research results provide scientific basis for water resources planning and management and vegetation construction in this area, and also provide reference for soil water storage research in other similar areas.

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历史
  • 收稿日期:2023-12-13
  • 最后修改日期:2024-01-16
  • 录用日期:2024-01-16
  • 在线发布日期: 2024-04-29
  • 出版日期: