Processed Continuous Resistivity Point Data from Cape Cod National Seashore, May 17-20, 2004

Continuous resistivity profiling (CRP) surveys were conducted at Cape Cod National Seashore in 2004 and 2006 in order to test hypotheses about groundwater flow under and into estuaries and the Atlantic Ocean. Coastal resource managers here and elsewhere are concerned about nutrients that are entering coastal waters via submarine groundwater discharge, which are contributing to eutrophication and harmful algal blooms. CRP is used to measure electrical resistivity of sediments, a property that is sensitive to differences in salinity of submarine ground water. The 2004 and 2006 surveys used floating resistivity streamers of 100 m and 50 m respectively. The depth penetration of the streamers is approximately 20% of the streamer length which translates to approximately 20-25 m with the 100 m streamer and 12-14 m with the 50 m streamer. These data were processed using AGI's EarthImager 2D software.

2004年与2006年，研究团队在科德角国家海岸（Cape Cod National Seashore）开展了连续电阻率剖面法（Continuous Resistivity Profiling，CRP）测量，以验证关于河口及大西洋下方与内部地下水流动的相关假说。当地及其他地区的海岸资源管理者均担忧，通过海底地下水排泄进入近海水域的营养盐会加剧水体富营养化与有害藻华的发生。该方法可用于测量沉积物的电阻率，这一物理属性对海底地下水的盐度差异具有敏感性。2004年与2006年的测量作业分别采用了长度为100米与50米的漂浮式电阻率拖缆。该类拖缆的探测深度约为其自身长度的20%，据此换算，100米拖缆的探测深度约为20至25米，50米拖缆则约为12至14米。上述测量数据均通过AGI公司的EarthImager 2D软件完成处理。