基于多种方法的宝坻新井水位异常分析

doi:10.12196/j.issn.1000-3274.2020.01.014

摘要/Abstract

摘要： 针对天津宝坻新井(117.4°E, 39.7°N)水位阶变异常, 选取该井及周边水体进行水化学分析, 结果表明宝坻新井水主要为大气降水成因, 存在一定的水岩作用, 周边水体与宝坻新井水之间没有明显水力联系; 采用有限单元法模拟了水坝泄水对宝坻新井的加卸载影响, 结果显示水坝泄水的应变量不足以引起宝坻新井水位的大幅阶变; 通过调和分析及含水层参数计算可知2017年以来宝坻新井潮汐参数及含水层水文介质参数未发生明显变化。据此推测, 宝坻新井水位异常可能与局部应力小幅调整过程中宝坻断裂及其次级断裂蠕动有关。本文采用的多种方法结合的异常分析思路可为今后判别地下水位异常干扰提供参考。

关键词: 水位, 水化学, 氢氧稳定同位素, 水文地质参数, 有限元模拟

Abstract: As to the abnormal of water level variation of new seismic observation well in Baodi, Tianjin. Firstly, the hydrochemical analysis of new well and the surrounding water sources is carried out, the result showed that new well water is mainly caused by atmospheric precipitation, and there is a certain water and rock action, either no obvious hydraulic connection between the surrounding water and new well. Secondly, simulated the reservoir discharge by finite element method, the consequence indicated that the strain of the reservoir discharge is not enough to cause the large scale change of the new well water level. Thirdly, through the harmonic analysis, it is found that the hydrographic medium parameters of the aquifer have not changed obviously when the water level of the new well is greatly changed. In summary, the main reason for the abnormal of the water level in the new well is probably the secondary fault of the Baodi fault has undergone a certain creep deformation under the regional stress, and resulting in the synchronous response process of the new well aquifer system near the fault. By the combination of various methods, this study can provide reference for judging the abnormal disturbance of groundwater level in the future.

Key words: Water level, Hydrochemistry, Stable oxygen and hydrogen isotopes, Hydrogeological parameters, Finite element simulation

中图分类号:

P315.7

王熠熙, 邵永新, 李悦, 王博, 刘双庆, 李赫, 王喜龙, 龚永俭. 基于多种方法的宝坻新井水位异常分析[J]. 地震, 2020, 40(1): 172-183.

WANG Yi-xi, SHAO Yong-xin, LI Yue, WANG Bo, LIU Shuang-qing, LI He, WANG Xi-long, GONG Yong-jian. A Study on Baodi Well Water Level Anomalies Using Multiple Methods[J]. EARTHQUAKE, 2020, 40(1): 172-183.

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