Characteristics of agricultural water use in Emin irrigation area based on principal component and information entropy
Taking agricultural water use in Emin Irrigation District as the research object,In this study,we applied principal component analysis,information entropy and equilibrium degree to carry out principal component analyze the 10 indicators data of the irrigation district from 2009 to 2021.The result shows that:the main drivers affecting agricultural water use in irrigation districts are six indicators:length of lined impermeable canals,irrigated area,area sown to crops,water-saving irrigated area,volume of irrigation water,and number of people in agriculture.Temporally,the water use composi-tion of Emin Irrigation District from 2009 to 2022 is dominated by agricultural irrigation water,and the water use for irrigation of cropland,garden land,forest land and pasture land accounted is 90.25%,3.12%,5.05%and 1.58%,respectively,and the water use for agricultural irrigation showed a decreasing trend year by year from 2010 to 2020.Spatially,the upstream of the irrigation area is dominated by surface water for agricultural water use,and the ratio of surface water and groundwater in the middle and downstream of the irrigation area is basically the same.From 2009 to 2022,the information entropy value and balance degree in different geographical locations of the irrigation area are:downstream>upstream>midstream,and the information entropy of the Northeast,Central,and West are 0.36,0.32,and 0.56 Nat respectively,and the mean values of the Northeast,Central,and West equilibrium are 0.26,0.23,and 0.40,respectively.The results of the analysis can provide theoretical references for the status quo of water use for irrigated agriculture in the irrigation area and the management of water use.
Emin Irrigation Districtagricultural irrigation water useprincipal component analysisinformation entropyequilibrium
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