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首页> 外文会议>World environmental and water resources congress >Surface-Ground Water Hydraulic Assessment of Coastal Subsurface Barriers under Simulated Rainfall and Sea Level Rise Flooding Conditions: Preliminary Laboratory-Scale Experiments and Model Development
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Surface-Ground Water Hydraulic Assessment of Coastal Subsurface Barriers under Simulated Rainfall and Sea Level Rise Flooding Conditions: Preliminary Laboratory-Scale Experiments and Model Development

机译：模拟降雨和海平面上升洪水条件下沿海地下障碍物的地表水水力评估：实验室规模的初步试验和模型开发

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Inland precipitation and sea level rise (SLR) are stressors that may affect coastal regions worldwide. Flooding is the main consequence of inland precipitation and SLR, and therefore, local and regional governments seek solutions for adaptation through effective storm and tidal water management. Challenges in coastal environments include topography, extreme hydrologic events, tides, subsurface geology, and surface-ground water interactions. The goal of this study was to support a larger research goal that pursues a fundamental understanding, including coupled-groundwater-surface mathematical models, of the potential of dike-like subsurface barrier systems as adaptation strategies in coastal urban areas of different subsurface characteristics. This paper presents preliminary results from experiments using a laboratory-scale physical model and their analysis and verification with the numerical flow-net model SEEP/W (from GeoStudio) that simulates seepage flow under subsurface barriers; results were then used to forecast flow conditions at realistic prototype scale conditions. Experiments and computational simulations, herein reported, focused on the subsurface of the barrier island sandy formation of the city of Miami Beach, FL. The specific objective of the study was to assess the effect of the depth of subsurface barriers on the Darcy's velocity and seepage flow. At pseudo-state state seepage conditions, various hydraulic head drops across the barrier headwater were tested to represent selected ponded conditions at the city of Miami Beach, including sea level rise. Seepage and Darcy's velocity were determined in the area of flow between the toe of the barrier and the bottom of the tank, along an averaged pathline of the seepage flow, and used to observe the effect of deeper depths of the barrier.
机译：内陆降水和海平面上升（SLR）是可能影响全球沿海地区的压力源。洪水是内陆降水和单反的主要后果，因此，地方和地区政府寻求通过有效的暴雨和潮水管理来寻求适应的解决方案。沿海环境的挑战包括地形，极端水文事件，潮汐，地下地质和地表水相互作用。这项研究的目的是支持一个更大的研究目标，该研究追求了对堤防样地下屏障系统作为适应不同地下特征的沿海城市地区的策略的潜力的基本理解，包括地下水-地下水耦合数学模型。本文介绍了使用实验室规模的物理模型进行的实验的初步结果，并使用了数值流网模型SEEP / W（来自GeoStudio）进行了分析和验证，该模型模拟了地下屏障下的渗流。然后将结果用于预测实际原型规模条件下的流动条件。本文报道的实验和计算模拟着重于佛罗里达州迈阿密海滩市的障壁岛砂岩地层的地下。该研究的具体目标是评估地下屏障深度对达西速度和渗流的影响。在伪状态渗流条件下，测试了跨屏障源头的各种水力压降，以代表迈阿密海滩市的选定蓄水池条件，包括海平面上升。在屏障的脚趾和储罐底部之间的流动区域中，沿着渗流的平均路径，确定渗流和达西的速度，并用于观察更深的屏障深度的影响。

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