某水库试验段区域地下水位动态特征与影响因素

Dynamic characteristics and influence factors of groundwater level in the experimental section of a reservoir

研究某水库蓄水对区域地下水动态的影响,以期为水库后期建设以及区域水资源管理提供相关科学依据。通过建立水库试验段气象-地下水监测系统,运用M-K趋势分析法分析研究区地下水位动态特征,选用变异系数法分析地下水位的时空间变异特征,采用灰色关联度法揭示其主导影响因子。结果表明:水库试验段地下水位整体表现为上升趋势且具有明显的丰枯特征,升幅约为0.5~2.0m/a;试验段渗漏量与地下水位变化呈负相关关系,渗漏对地下水位的影响存在一定空间差异,即对东部地下水位的影响大于西部;西部地下水位的主导影响因子为降雨量,东部地下水位的主导影响因子为渗漏量和降雨量。

Doumen reservoir is an important part of the water diversion and distribution project from the Hanjiang River to the Weihe river in Shaanxi province.The impact of Doumen reservoir′s impoundment on regional groundwater dynamics was studied to provide a relevant scientific basis for the later construction of the reservoir and regional water resources management.Through the establishment of the Meteorological-Groundwater Monitoring System of the Doumen reservoir experimental section,the dynamic characteristics of the groundwater level were analyzed by the Mann-Kendall test in the study area.The timevariation characteristics of the groundwater level were analyzed by the coefficient of variation method,and the grey correlation method was used to reveal its dominant influence factors.The results show that:the overall performance of the groundwater level in the experimental section of Doumen reservoir is an upward trend and obvious characteristics of high and dry conditions,with an increase of about 0.5-2.0 m/a;the leakage of the test section was negatively correlated with the change of groundwater level,and the leakage had an effected on groundwater level,there was a certain spatial difference in the impact,that was,the impact on the water table in the east was greater than that in the west;the dominant influencing factor on the groundwater level was rainfall in the west,and leakage and rainfall were in the east.