Impacts of Cropland Change and Water-Saving Irrigation on Surface Water Consumption and Groundwater in the Middle Reaches of Heihe River
In order to investigate the characteristics of surface water consumption and groundwater dynamics under the influence of the change of cultivated land area and water-saving irrigation in the middle reaches of the Heihe River,based on the monthly data of the measured runoff from the hydrographic stations of Yingluoxia and Zhengyixia of the Heihe River and the monthly data of the depth of 49 groundwater observa-tion wells in the middle reaches of the Heihe River from 1985 to 2022,and combined with the results of the field research on water-saving ir-rigation,the response of surface water consumption and depth of groundwater to the change of cultivated land area and water-saving irrigation since the unification of water quantity regulation had been analyzed with the help of statistical analysis.The response of surface water con-sumption and groundwater depth to the change of cultivated area and water-saving irrigation was analyzed by statistical analysis.The results show that:under the multiple influences of the change of cultivated area,water-saving irrigation and water resource management,the surface water consumption in the middle reaches of the Heihe River has been slightly decreased since the integrated regulation;the groundwater depth in the middle reaches of the Heihe River shows an increasing trend in general,and the depth of the groundwater in the southeastern and northeastern parts of the Daman irrigation area,which is the largest cultivated area and in the central part of the Youlian irrigation area,has been obviously increased;and the impact of different irrigation methods on the depth of the groundwater is also very serious.Different irriga-tion methods also have great influence to the depth of groundwater,which varies with the amount of surface water infiltration and recharge in the river irrigation area,and varies with the amount of groundwater extraction in the well irrigation area and mixed irrigation area.
surface water consumptiongroundwater depthchanges in cropland areawater-saving irrigationmiddle reaches of Heihe River
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