通过对西北干旱区农业、工业和城镇生活节水途径的分析,定量计算了2020水平年的节水潜力;根据工业和城镇用水情况,定量描述了远景污水处理回用水量;以水资源可利用量作为潜在能力,从水利工程对水资源实际调控角度,进行地表水和地下水可供水量预测,给出了定量分析结果。认识到:要在整体上维持西北干旱区生态环境现状并使局部区域有所改善,南水北调西线工程远景向黄河中上游补水,并通过换水支持河西走廊的经济发展和生态建设是必要的。

Potentials of water resources development and utilization in arid zone of Northwest China were studied in this paper.On the basis of analysis of approaches to water conservation in agricultural,industrial and urban domestic uses in arid zone in Northwest China,the potential of water conservation in2020target year,and,according to the situation of industrial and domestic water uses,wastewater reuse in the future were quantitatively estimated.By considering available water resources as the potential and actual capacity of regulating water resources by hydraulic engineering works as constraint,the water quantity that could be supplied from surface water and groundwater was calculated and predicted.The result of quantitative analysis showed that,for the sake of maintaining the ecological system and protecting the environment of the arid zone in Northwest China on the whole,and improving partial areas,it would be necessary for the West Route South-to-North Water Transfer Project to divert water to the upper and middle reaches of the Yellow River for the economic development and the ecological restoration in the Hexi Corridor by means of replacing the original water uses with water transferred in a long-term plan.