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Effects of episodic rainfall on a subterranean estuary

机译：间歇性降雨对地下河口的影响

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Numerical simulations were conducted to examine the effect of episodic rainfall on nearshore groundwater dynamics in a tidally influenced unconfined coastal aquifer, with a focus on both long-term (yearly) and short-term (daily) behavior of submarine groundwater discharge (SGD) and seawater intrusion (SWI). The results showed nonlinear interactions among the processes driven by rainfall, tides, and density gradients. Rainfall-induced infiltration increased the yearly averaged fresh groundwater discharge to the ocean but reduced the extents of the saltwater wedge and upper saline plume as well as the total rate of seawater circulation through both zones. Overall, the net effect of the interactions led to an increase of the SGD. The nearshore groundwater responded to individual rainfall events in a delayed and cumulative fashion, as evident in the variations of daily averaged SGD and salt stored in the saltwater wedge (quantifying the extent of SWI). A generalized linear model (GLM) along with a Gamma distribution function was developed to describe the delayed and prolonged effect of rainfall events on short-term groundwater behavior. This model validated with results of daily averaged SGD and SWI from the simulations of groundwater and solute transport using independent rainfall data sets, performed well in predicting the behavior of the near-shore groundwater system under the combined influence of episodic rainfall, tides, and density gradients. The findings and developed GLM form a basis for evaluating and predicting SGD, SWI, and associated mass fluxes from unconfined coastal aquifers under natural conditions, including episodic rainfall.
机译：进行了数值模拟，研究了潮汐降雨对潮汐影响的无限制海岸含水层中近岸地下水动力学的影响，重点是海底地下水排放（SGD）和长期（每年）和短期（每天）行为。海水入侵（SWI）。结果表明，降雨，潮汐和密度梯度驱动的过程之间存在非线性相互作用。降雨引起的渗透增加了每年平均向海洋的淡水平均排放量，但减少了咸水楔和上层盐水羽流的范围以及穿过这两个区域的海水总循环速度。总体而言，交互作用的净效应导致SGD的增加。近岸地下水以延迟和累积的方式对单个降雨事件做出响应，这可以从日平均SGD和盐水楔中存储的盐的变化（量化SWI的程度）中看出。建立了广义线性模型（GLM）以及Gamma分布函数，以描述降雨事件对短期地下水行为的延迟和长期影响。该模型通过使用独立的降雨数据集对地下水和溶质运移的模拟得到的每日平均SGD和SWI的结果进行了验证，在预测性降雨，潮汐和密度的综合影响下，在预测近岸地下水系统的行为方面表现出色渐变。这些发现和完善的GLM构成了评估和预测自然条件（包括暴雨）下无限制海岸含水层的SGD，SWI和相关质量通量的基础。

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  • 来源
    《Water resources research》 |2017年第7期|5774-5787|共14页
  • 作者

    Yu Xiayang; Xin Pei; Lu Chunhui; Robinson Clare; Li Ling; Barry D. A.;

  • 作者单位

    Hohai Univ, State Key Lab Hydrol Water Resources & Hydraul En, Nanjing, Jiangsu, Peoples R China;

    Hohai Univ, State Key Lab Hydrol Water Resources & Hydraul En, Nanjing, Jiangsu, Peoples R China;

    Hohai Univ, State Key Lab Hydrol Water Resources & Hydraul En, Nanjing, Jiangsu, Peoples R China;

    Western Univ, Dept Civil & Environm Engn, London, ON, Canada;

    Univ Queensland, Sch Civil Engn, Brisbane, Qld, Australia;

    Ecole Polytech Fed Lausanne, Fac Environm Nat Architectural & Construit ENAC, IIE, Lab Technol Ecol ECOL, Lausanne, Switzerland;

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