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首页> 外文期刊>Journal of Hydroinformatics >Numerical modeling of the effects of pumping on tide-induced groundwater level fluctuation and on the accuracy of the aquifer's hydraulic parameters estimated via tidal method: a case study in Donghai Island, China
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Numerical modeling of the effects of pumping on tide-induced groundwater level fluctuation and on the accuracy of the aquifer's hydraulic parameters estimated via tidal method: a case study in Donghai Island, China

机译：抽水对潮汐引起的地下水位波动和潮汐法估算含水层水力参数精度影响的数值模拟：以中国东海岛为例

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摘要

Coastal groundwater level is affected both by tide and pumping. This paper presents a numerical model to study the effects of pumping on tide-induced groundwater level fluctuation and on accuracy of hydraulic parameters estimated via tidal method. Firstly, for the effects of pumping on the groundwater level fluctuation under the combined influence of pumping and tide, groundwater level has a drawdown but eventually reaches a quasi-steady-state again. Steady pumping can attenuate the amplitude but cannot affect the phase of the quasi-steady fluctuation. However, seaward steady pumping plays a relatively obvious role in enhancing drawdown compared with landward pumping, a partial penetration well leads to greater drawdown than a full penetration well, and transient pumping induces large amplitude which does not reflect large transmissivity. Secondly, for the effects of pumping on the accuracy of the parameter estimated via the tidal method, transient pumping or large steady pumping, especially in a full penetration well, significantly affects accuracy of the estimated parameters. However, when the distance between the pumping well and tide observation well exceeds 200% of the distance between observation well and shoreline, pumping effect on estimated parameters can be neglected. The conclusions could provide guidance for reasonable application of the tidal method.
机译：沿海地下水位受潮汐和抽水影响。本文提出了一个数值模型来研究抽水对潮汐引起的地下水位波动和潮汐法估算的水力参数精度的影响。首先，对于抽水和潮汐共同作用下抽水对地下水位波动的影响，地下水水位有所下降，但最终又恢复到准稳态。稳定泵浦可以衰减幅度，但不能影响准稳态波动的相位。然而，与陆上抽水相比，海底稳定抽水在增加垂降方面起着相对明显的作用，部分渗透井比全渗透井导致更大的垂降，并且瞬态抽水会引起大振幅，而不能反映大的透射率。其次，对于抽水对通过潮汐法估算的参数准确性的影响，瞬态抽水或大型稳定抽水（尤其是在全渗透井中）会显着影响估算参数的准确性。但是，当抽水井与潮汐观测井之间的距离超过观测井与海岸线之间的距离的200％时，可以忽略抽水对估计参数的影响。结论可以为潮汐法的合理应用提供指导。

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