Study on Water Saving Potential of Irrigated Area Based on Remote Sensing Evapotranspiration Model
In order to evaluate the water-saving potential of an irrigation district and formulate a scientific water-saving plan,the irrigation water utilization efficiency and water productivity of the irrigation district from 2013 to 2020 are measured,and the water-saving potential of different water-saving plans are determined from different perspectives.The results show that the utilization efficiency of irrigation water is positively correlated with the the local precipitation and negatively correlated with the net irrigation water quantity.In case of less local precipitation and less net irrigation water quantity,the water-saving potential is higher.According to the calculation results of cumulative water productivity from 2013 to 2020,the short-term(50%of the annual average cumulative water productivity)and long-term(70%of the annual average cumulative water productivity)target water productivity are 1.12 kg/m3 and 1.31 kg/m3 respectively.The short-term and long-term cumulative crop water-saving potential are 1.213×108 m3 and 2.804×108 m3 respectively,indicating that the higher the water productivity,the greater the cumulative water-saving potential,and the improvement of water productivity has a significant effect on water saving.
water-saving potentialengineering water savingcrop water savingwater productivity
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