水电工程影响下格尔木河冲洪积扇地下水补给量评价

Assessment on groundwater recharge in the alluvial-proluvial fan of Golmud River basin under the impacts from hydro-engineering projects

近年来,随着格尔木河水电工程建设的推进,格尔木冲洪积扇水文地质条件发生了重大变化,地下水补给、径流、排泄条件的改变导致水资源结构有所调整,其中地下水补给量如何变化是一个关键问题。本研究收集了长序列的格尔木河水文观测和水库运行资料,分析评价水电工程修建后冲洪积扇区地下水补给量,重点分段评估了河水渗漏量,得到研究区的补给量为:丰水年247.0×10^(4)m^(3)/d,平水年211.8×10^(4)m^(3)/d,枯水年197.5×10^(4)m^(3)/d。评价结果充分考虑了水电工程运行对地下水补给的长期影响,为区域水资源评价与开发利用提供了新的依据。

In recent years,with the continuous construction of Golmud River hydro-engineering projects,the hydrogeological conditions of alluvial-proluvial fan of Golmud have changed greatly. The change of groundwater recharge,runoff and discharge conditions leads to the structure of water resources to be adjusted,and among them the groundwater recharge changing law is a key problem. In this paper,the groundwater recharge of Glomud alluvial-proluvial fan after the construction of hydropower projects was analyzed by collecting a long term of Golmud River hydrographic observations and the reservoir operation data. The seepage amount of the river water was evaluated in different sections. The recharge quantity in the study area is about 247. 0×10^(4)m^(3)/d in a wet year,211. 8×10^(4)m^(3)/d in a normal flow year,197. 5×10^(4)m^(3)/d in a dry year respectively. The evaluation results have fully considered the long-term impact that hydropower project operation on groundwater recharge and provide a new basis for regional water resources evaluation and development utilization.