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首页> 外文期刊>Estuarine Coastal and Shelf Science >Sea level periodic change and its impact on submarine groundwater discharge rate in coastal aquifer
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Sea level periodic change and its impact on submarine groundwater discharge rate in coastal aquifer

机译：海平面周期性变化及其对沿海含水层海底地下水排放率的影响

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This study focused on the interaction between groundwater and seawater and the effect of temporal scale of sea level fluctuation on submarine groundwater discharge (SGD) rate. The numerical code FEFLOW (Diersch, 2005) was used to evaluate the influence of periodic changes in sea level on an increase in SGD at various time scales from diurnal to glacial cycles. Simulation results showed that not only amplitude but also period of the sea level fluctuation controls total amount of SGD. The increase ratio of recirculated submarine groundwater discharge (RSGD) was found to generally be proportional to the amplitude of sea level and the square root of specific storage of an aquifer while inversely proportional to the square root of hydraulic conductivity of an aquifer and period of sea level fluctuation. A nondimensional number P~* that incorporates combined effect of sea level oscillation and aquifer properties is used to represent the magnitude of periodic forcing from sea boundary into an aquifer as a mechanism for enhancement of RSGD. Simulation results demonstrate that increase ratios of RSGD are well fitted by an exponential curve as a function of P~*, and variations in RSGD occur only when P~* exceeds a critical number. The dimensionless inland recharge rate, where recharge rate is divided by hydraulic conductivity, was shown to be important in determining the critical number. This implies that sea level fluctuation does not lead to enhancement of RSGD until the specified condition is reached, and groundwater recharge rate and aquifer hydraulic conductivity are the key factors controlling the increase of RSGD.
机译：这项研究的重点是地下水与海水之间的相互作用以及海平面波动的时间尺度对海底地下水排放率的影响。使用数字代码FEFLOW（Diersch，2005年）来评估海平面周期性变化对从昼夜到冰川周期各个时间尺度上SGD升高的影响。仿真结果表明，海平面波动的幅度和周期不仅控制了SGD的总量，而且还控制了SGD的总量。发现循环水下海底地下水排放量（RSGD）的增加比例通常与海平面的振幅和含水层特定储量的平方根成正比，而与含水层的水力传导率和海域的平方根成反比电平波动。结合海平面振荡和含水层性质的综合作用的无量纲数P〜*被用来表示从海边界到含水层的周期性强迫的幅度，作为增强RSGD的一种机制。仿真结果表明，RSGD的增加比例可以很好地拟合作为P〜*的函数的指数曲线，而RSGD的变化仅在P〜*超过临界值时才会发生。无量纲内陆补给率，其中补给率除以水力传导率，被证明对确定临界值很重要。这意味着直到达到特定条件，海平面的波动才导致RSGD的增加，而地下水的补给率和含水层的水力传导率是控制RSGD增加的关键因素。

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