Simulation of groundwater regime in response to rainfall and identification of anomalies in a fault zone
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摘要: 穿越断裂带的观测井能够提供特殊的构造运动信息，其水位动态是构造活动、降雨等各种因素综合作用的结果．对由降雨引起的水位动态进行模型解译，有利于更加准确地提取断裂带的构造活动异常．根据断裂带地下水循环的基本特征进行简化，利用响应函数法描述入渗补给的滞后特征，建立了降雨——水位动态的组合水箱模型．该模型被用于分析北京八宝山断裂带大灰厂观测孔2008年上半年的水位动态，发现2008年5月存在显著的异常．这种异常可能与局部或区域的构造活动有关，也可能是断裂带结构参数变化的结果．Abstract: The monitoring wells penetrating fault zones can provide special information on tectonic activity. The groundwater regime in the fault zones is an integrated interaction result of various factors such as geological structure activities and rainfall, etc. Simulating the groundwater level change caused by rainfall is beneficial to accurately identifying the anomalies induced by tectonic activities. Based on the characteristics of groundwater circulation in the fault zones, a tank model combing rainfallgroundwater regime has been established. In this model, response function method is employed to express the retard of infiltration recharge. The model is used to simulate the groundwater regime of a monitoring well in the Babaoshan fault zone during 2007mdash;2008. Four anomalous rises of groundwater level were identified during the period. Those anomalies may be related to the intermittently creep of Babaoshan fault zone.
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