2012年10月后皖27井水位下降成因分析  

Causes of Groundwater Level Decreases in Wan-27 Well since October 2012

作　　者：方震[1] 孙盼盼[1] 李军辉[1] 李玲利[1] 汪丹丹[1] 王远[1] 

机构地区：[1]安徽省地震局,安徽合肥230031

出　　处：《地震》2016年第2期85-93,共9页Earthquake

基　　金：地震科技星火计划攻关项目(XH13010);地震行业科研专项(201308012)资助

摘　　要：地下水动态的异常变化既有可能是地震前兆异常信息,也有可能是某种环境干扰所引起的,如何及时识别并排除环境干扰,对于成功判定地震前兆异常至关重要。马鞍山皖27井水位自2012年10月以来反复出现下降型异常,下降程度超正常年份最低值,最大降幅达70cm。为了准确客观地判定该异常的成因,本文利用水化学和物理相结合的方法对皖27井地下水动态变化成因及开采干扰进行分析,研究表明:大气降水在皖27井水补给源中占了一定的份额,除此之外,还存在深部补给来源;深井抽水活动影响着皖27井水位的变化,但不能将皖27井本次异常变化完全归因于深井抽水,区域构造活动是引起本次水位异常的主要原因。本文所采取的异常识别与分析方法,为今后地下水动态异常识别及前兆判定工作提供重要依据。Abnormal dynamic change of groundwater could be precursors of earthquakes,but it was sometimes induced by other environmental disturbances.For distinguishing earthquake precursor,it is important to identify environmental disturbance in time.Groundwater level of Wan-27 well repeatedly decreased since October 2012,and the maximum amplitude was about 70 centimeters.To determine the cause of the abnormality accurately,in this study,the source and exploiting interference are analyzed combined with the hydro-chemical and physical methods,and the hydrochemical and physical characteristics of the Wan-27 well water and surface water nearby are studied.The results show that,the precipitation recharge accounts for a certain percentage of sources of Wan-27 well,waterrock effect is relatively low,and there are deep groundwater recharges.Groundwater pumping is one of the factors for the repeatedly decreasing of groundwater level in Wan-27 well,furthermore,the abnormality can＇t completely be due to deep groundwater pumping,regional tectonic activity is the main cause of the water level anomaly.The approach of this study may be helpful to disturbance identification and precursor confirmation in the future.

关 键 词：水位下降 地下水开采 水化学 成因分析 

分 类 号：P315.7[天文地球—地震学]