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Numerical study of wave effects on groundwater flow and solute transport in a laboratory beach

机译:波浪对实验室海滩地下水流动和溶质运移影响的数值研究

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摘要

A numerical study was undertaken to investigate the effects of waves on groundwater flow and associated inland-released solute transport based on tracer experiments in a laboratory beach. The MARUN model was used to simulate the density-dependent groundwater flow and subsurface solute transport in the saturated and unsaturated regions of the beach subjected to waves. The Computational Fluid Dynamics (CFD) software, Fluent, was used to simulate waves, which were the seaward boundary condition for MARUN. A no-wave case was also simulated for comparison. Simulation results matched the observed water table and concentration at numerous locations. The results revealed that waves generated seawater-groundwater circulations in the swash and surf zones of the beach, which induced a large seawater-groundwater exchange across the beach face. In comparison to the no-wave case, waves significantly increased the residence time and spreading of inland-applied solutes in the beach. Waves also altered solute pathways and shifted the solute discharge zone further seaward. Residence Time Maps (RTM) revealed that the wave-induced residence time of the inland-applied solutes was largest near the solute exit zone to the sea. Sensitivity analyses suggested that the change in the permeability in the beach altered solute transport properties in a nonlinear way. Due to the slow movement of solutes in the unsaturated zone, the mass of the solute in the unsaturated zone, which reached up to 10% of the total mass in some cases, constituted a continuous slow release of solutes to the saturated zone of the beach. This means of control was not addressed in prior studies.
机译:基于实验室海滩上的示踪剂实验,进行了一项数值研究,以研究波浪对地下水流量和相关的内陆释放的溶质运移的影响。 MARUN模型用于模拟受波浪影响的海滩的饱和和非饱和区域中密度依赖的地下水流和地下溶质的运移。计算流体动力学(CFD)软件Fluent用于模拟波浪,这是MARUN向海的边界条件。还模拟了无波动情况以进行比较。模拟结果与观察到的地下水位和许多位置的浓度相匹配。结果表明,波浪在海滩的冲刷和冲浪区产生了海水-地下水的循环,从而引起了整个海滩面大量的海水-地下水交换。与无浪情况相比,浪显着增加了停留时间和内陆溶质在海滩中的扩散。波浪还改变了溶质通道,使溶质排放区进一步向海移动。停留时间图(RTM)显示,内陆溶质在海中的溶质出口区域附近,由波引起的溶质停留时间最大。敏感性分析表明,海滩渗透率的变化以非线性方式改变了溶质的运移特性。由于溶质在非饱和区的缓慢运动,在某些情况下,不饱和区中溶质的质量达到总质量的10%,构成了溶质向海滩饱和区的连续缓慢释放。 。在以前的研究中没有涉及这种控制手段。

著录项

  • 来源
    《Journal of Contaminant Hydrology》 |2014年第9期|37-52|共16页
  • 作者单位

    Center for Natural Resources Development and Protection, Department of Civil and Environmental Engineering, New Jersey Institute of Technology, Newark, NJ 07102, United States;

    Center for Natural Resources Development and Protection, Department of Civil and Environmental Engineering, New Jersey Institute of Technology, Newark, NJ 07102, United States;

    Changjiang River Scientific Research Institute (CRSRI), Changjiang Water Resources Commission of MWR, Wuhan 430010, China;

    School of Water Resources and Environmental Science, China University of Geoscience-Beijing, Beijing 100083, China;

    Center for Natural Resources Development and Protection, Department of Civil and Environmental Engineering, New Jersey Institute of Technology, Newark, NJ 07102, United States;

    Department of Chemistry and Environmental Science, New Jersey Institute of Technology, Newark, NJ 07102, United States;

    Department of Mechanical Engineering, Clemson University, Clemson, SC 29634-0921, United States;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Waves; Groundwater flow; Tracer; MARUN numerical model; Laboratory beach;

    机译:波浪;地下水流量;示踪剂MARUN数值模型;实验室海滩;
  • 入库时间 2022-08-17 13:40:00

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