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《Journal of Anhui Agricultural Sciences》 2010-35
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Determination and Prediction of Water Efficiency of Trunk and Branch Channels

WEI Xin-guang et al(The Key Laboratory of Agricultural Soil and Water Engineering in Arid Area of Ministry of Education,Northwest A﹠F University,Yangling,Shaanxi 712100)  
Water distribution data of trunk and branch channels at irrigation districts during 20 years from 1989 to 2008 were analyzed to determine the first side of the ditches and sublateral canal water yield over the years,and the above two flows were fitted by using GM(1,1) Grey Prediction Model,finally,water efficiency of trunk and branch channels were determined.Besides,water efficiency of trunk and branch channels at irrigation districts were modeled over the years.The results showed that the average relative error of the two fitting models were 1.849 % and 1.036%,respectively,and could satisfy the error's demand of the models.Then the two models would be used to predict the water efficiency of trunk and branch channels at irrigation districts in the next 5 years,and water efficiency of trunk and branch channels at irrigation districts would be determined between 0.706 and 0.680 in the next 5 years.
【CateGory Index】: S274.4
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