Abstract
Abstract. Regulation of the water table is a feasible and effective way to reduce the risk of groundwater exploitation. An index system of groundwater exploitation risk evaluation is developed. The groundwater numerical simulation model is established for Zhangye basin in the middle reaches of Heihe River basin, China. Based on the identification and validation, the model is used for numerical simulation and forecast of groundwater exploitation under the conditions of current and planned development. The results show that the increase of groundwater exploitation amount causes the falling of water table. The increase of groundwater exploitation is 7600 × 104 m3, which can displace the surface water amount of 10 100 × 104 m3. The annual river runoff can increase 7536 × 104 m3. It is beneficial to the let-down flow from Zhengyi Gorge cross-section, and also provides the basis for decision on risk control of groundwater exploitation.
Highlights
Zhangye basin, with an area of about 8200 km2, is located in the middle reaches of Heihe River basin, Hexi Corridor, North-western China’s Gansu Province
The risk of groundwater exploitation is that the use of regional water resources is not reasonable; it is clear that the surface water resource utilization is saturated, but groundwater resource utilization still has potential (Su Jianping, 2005)
In the fine soil plain of the middle reaches and along the two banks of Heihe River, groundwater table depth is less than 5 m and thickness of the aquifer is big; the amount of groundwater resource is rich
Summary
With an area of about 8200 km, is located in the middle reaches of Heihe River basin, Hexi Corridor, North-western China’s Gansu Province. It is the region which has the highest degree and largest amount of water resource utilization, and the key area for control of the water-cycle evolution in Heihe River basin. In the fine soil plain of the middle reaches and along the two banks of Heihe River, groundwater table depth is less than 5 m and thickness of the aquifer is big; the amount of groundwater resource is rich
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