Change of Ecological Baseflow Value of the Upper Main Stream of Shaying River by Coefficient of Variation Method
To identify the variation law of ecological baseflow value,the factor system affecting ecological baseflow is established based on the data of rainfall,evaporation,discharge,per capita water consumption,per capita GDP and water quality compliance rate of Gaocheng,Huaxing and Huangqiao sections of the upper main stream of Shaying River from 2008 to 2021.The inter-annual changes of the ecological baseflow value of the reaches are studied by the coefficient of variation method and based on the ecological base flow value in 2021.The results show that,(a)the annual ecological baseflow value is 48.3 million-472.6 million yuan in Gaocheng section,1.010 6 billion-7.995 4 billion yuan in Huaxing section,and 0.720 1 billion-4.643 1 billion yuan in Huangqiao section,respectively;(b)the weight of water quality in the Gaocheng and Huangqiao sections are the largest,followed by discharge and precipitation;(c)due to better water quality in Huaxing section,the weight of flow is the largest,followed by water quality and precipitation;and(d)the weights of economic,evaporation and water consumption are smaller in each river section,which has little impact on the value of ecological baseflow.The order of annual discharge and precipitation in the reaches is Huangqiao>Huaxing>Gaocheng,but the order of ecological baseflow value is Huaxing>Huangqiao>Gaocheng,indicating that the value of ecological baseflow first depends on water quality,followed by discharge and precipitation.
ecological baseflowvaluecoefficient of variation methodweightvariationthe upper main stream of Shaying River
国家科技期刊平台
NSTL
万方数据
