西北干旱区地表水与地下水资源转换的几个问题探讨

SOME PROBLEMS ON WATER RESOURCES INTERACTIONS BETWEEN GROUNDWATER AND SURFACE WATER IN THE ARID ZONE OF NORTHWEST CHINA

从山区至平原，地表水与地下水之间在不同地质地貌单元相互转换，是我国西北干旱区山前平原水资源的主要特点，直接影响到水资源开发利用模式的变化。随着河水利用率不断提高，减少了地下水补给来源，引起地下水位下降，泉水量削减，甚至枯竭，迫使泉灌区变成井灌区。这在水资源开发利用程度较高的河西走廊和天山北坡都出现了这一问题。

Groundwater surface water interactions in different geological geomorphological units in areas ranging from mountains to piedmont plains constitute a significant feature which exerts direct impact on changes of water resource development models in arid zone of northwast China.Along with the continually increasing utilization rate of stream water,groundwater and spring discharge have been reduced and even exhausted.Furthermore,spring irrigated area had to be turned into well irrigated area.In northern piedmont plains of the Tianshan Mountains and the Hexi Corridor where the water resources development degree is very high,similar problems also exist.