Ecological Vulnerability Analysis of the Qinhe River Basin Based on SWAT and Water Stress Index
Ecological vulnerability is an important attribute that integrates the level of health of watershed ecosystems,and water resources are the key factor in maintaining the health and sustainability of watershed ecosystems.Therefore,assessing the ecological vulnerability of watersheds from the field of water resources and analyzing their spatial and temporal variability characteristics are of great research value for coping with the pressure of water scarcity in watersheds and improving the health of watershed ecosystems.This paper takes the Qinhe River Basin as a research object,constructs the SWAT model of the basin,introduces the water stress calculation formula,and quantifies the temporal changes and spatial distribution char-acteristics of ecological vulnerability in the Qinhe River Basin from 2010 to 2016 from the perspective of evapotranspiration.The results show that:① After the rate determination and validation of the SWAT model,ENS and R2 meet the model's re-quirements,indicating that the model has good applicability in the Qinhe River Basin.② The interannual water stress in-dex of the basin decreases with time,which indicates that the ecological vulnerability and ecosystem status of the Qinhe River Basin are improving year by year,and evapotranspiration is the main influencing factor.③ The basin's water stress index varies greatly within the year,and ecological vulnerability is higher from December in this year to February in the next year;combined with the results of related studies,precipitation and snow and ice weather are considered to be the main influencing factors.④ The overall ecological vulnerability status of the basin has been improved year by year,but the spatial differentiation of ecological vulnerability within the basin shows an expanding trend.
SWAT modelwater stress indexecological vulnerabilityanalysis of the evolution of spatial and temporal pat-ternsthe Qinhe River Basin
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