Comparison of transfer function models for well-aquifer system response to atmospheric loading
Comparison of transfer function models for well-aquifer system response to atmospheric loading
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DOI：
10.1016/j.jhydrol.2020.125494
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发表时间：
2020-11
影响因子：
6.4
通讯作者：
Xiaolong Sun;Y. Xiang
中科院分区：
文献类型：
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作者：
Xiaolong Sun;Y. Xiang
井水位对周期载荷的响应分析是研究井水-含水层系统对地壳应变响应的有效方法，井水位气压响应分析是其中一种方法。本研究分析了中国大陆11口威尔斯井的水位-气压传递函数，响应频率从0.1 cpd到几十cpd不等（多数威尔斯井> 40 cpd）。结果表明，8口威尔斯井水位的气压响应与理论增益-ω曲线相吻合。对8个井系的流动特性和水力参数进行了分析。三口威尔斯井的结果与理论增益-ω曲线拟合不佳，可能是由于水位响应受除气压载荷外的其他因素影响，导致水位数据中存在噪声信号。虽然适用于所有含水层的模型更通用，但输入参数较多，难以用于拟合。由于位于半承压含水层中的威尔斯井在现场更为常见，尤其是那些用于识别地壳浅层应变/应力的井，因此半承压含水层的简化模型更适合于大多数这类威尔斯井。
The analysis of well water level response to periodic loadings is an effective way of studying the response of a well-aquifer system to crustal strains, and barometric response analysis of well water levels is one technique used for this. In this study, the transfer function of the water level to barometric pressure in 11 wells in Mainland China was analyzed, with response frequencies ranging from 0.1 cpd to dozens of cpd (for most wells > 40 cpd). Results showed that the barometric response of the water levels in eight wells coincide with the theoretical Gain-ωcurve. Flow properties and hydraulic parameters of the corresponding eight well-systems were also analyzed. Results of three wells did not fit well with the theoretical Gain-ωcurve, likely owing to the water level responses, which were affected by other factors besides barometric loading, leading to noise signals in the water level data. Although the model suitable for all aquifers is more general, more input parameters make it difficult to use for fitting. Since wells located in semi-confined aquifers are more common in the field, especially those used to identify strain/stress in shallow crustal, so simplified models for semi-confined aquifer are more suitable for most of these wells.