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Variations of Groundwater in Zhangye Basin of the Middle Reaches of the Heihe River in Recent Two Decades

YANG Ling-yuan~1, WANG Gen-xu~{1, 2} (1. College of Earth and Environment Sciences, Lanzhou University, Lanzhou Gansu 730000, China; 2. State Key Laboratory of Frozen Soil Engineering, CAREERI, CAS, Lanzhou Gansu 730000, China)  
To study the variation of groundwater, which is an important source and the best choice for drinking water in the arid regions, is vital to the sustainable exploitation, utilization, and reasonable management of groundwater. Based on the investigation of hydrogeological conditions in Zhangye Basin in the middle reaches of the Heihe River and the division of groundwater, the temporal-spatial variations of groundwater level and storage from 1981 to 2001 are analyzed. It is revealed that: (1) Due to the difference of the storage conditions, the annual variation of groundwater is differential remarkably in the four sub-areas. In the upper-middle of the alluvial-diluvial fan, the storage of groundwater totally reduced 56.47×10~6m~3 in the 1980s, and 150.83×10~6m~3 in the 1990s; in the lower part of the alluvial-diluvial fan, it reduced 11.80×10~6m~3 in the 1980s, and 77.50×10~6m~3 in the 1990s; in the fine-grained soil plain, it reduced 0.56×10~6m~3 in the two decades; and in the river-valley plain, it totally increased 1.78×10~6m~3 in the two decades. Furthermore, the variation range increased individually in the 1990s. (2) The monthly variation of groundwater of every area in the basin was complicated, and had the remarkable temporal differential. Exploited and hydrological-runoff variations were primary in the upper-middle of the alluvial-diluvial fan; there were hydrological-runoff and irrigated variations in the lower part of the alluvial-diluvial fan; the irrigated-exploited and the irrigated-runoff types were dominant in the fine-grained soil plain; and in the river valley plain the irrigated-runoff was the primary variation type. Moreover, the monthly variation seemed to be enhanced to some extent in the 1990s.
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