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首页> 外文会议>SEG Houston 2013 >Electrical Resistivity Imaging of Groundwater Dynamics in Coastal Aquifers in the Southeastern U.S.
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Electrical Resistivity Imaging of Groundwater Dynamics in Coastal Aquifers in the Southeastern U.S.

机译：美国东南部沿海含水层地下水动态的电阻率成像

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Groundwater flow in coastal aquifers is influenced by hydrologic processes that operate over a wide range of temporal scales, including storm events, tides, seasonal variations in precipitation and evapotranspiration (ET). Groundwater salinity can be a useful first-order indicator of the balance between these flow processes as saline seawater mixes with freshwater from uplands/islands (Figure 1). Electrical resistivity imaging is highly useful for detailed, spatially continuous measurement of subsurface conductivity to investigate the spatial and temporal variation in groundwater salinity. Approximately monthly repeat resistivity surveys were conducted at two locations. on Crabhaul Creek, at the margin of a salt-marsh estuary in South Carolina, and single surveys were conducted at a marsh hammock in Econfina River State Park, FL and a beach at Sapelo Island, GA Resistivity models at Crabhaul Creek and Sapelo Island were corroborated by simultaneous measurements of salinity in nearby piezometers that showed excellent agreement. The freshwater-brackish water interface was clearly imaged by resistivity in each case, and used to constrain hydrologic models and guide well installation.
机译：沿海含水层的地下水流量受水文过程的影响，该过程在各种时间尺度上运行，包括风暴事件，潮汐，沉淀和蒸散蒸腾的季节性变化（ET）。地下水盐度可以是这些流程过程之间的平衡的有用的一阶指示器，作为盐水海水与来自Uplands /岛的淡水混合（图1）。电阻率成像对于详细，空间连续测量地下电导率的测量非常有用，以研究地下水盐度的空间和时间变化。在两个位置进行大约每月重复电阻率调查。在Crabhaul Creek，在南卡罗来纳州盐沼河口的边缘，并在Crabhaul Creek和Sapelo Island的GA电阻率模特的沼泽地河畔墨西哥河河国家公园的沼泽吊床上进行了一次调查通过在附近的压力仪中同时测量盐度的同时测量，这些压力仪显示出很好的一致性。在每种情况下通过电阻率清楚地成像淡水 - 咸水界面，并用于限制水文模型和导向井安装。

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