Processed Continuous Resistivity Point Data from Cape Cod National Seashore, Feb. 28, 2006

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，课题组于科德角国家海岸开展了连续电阻率剖面法（Continuous resistivity profiling，CRP）勘测，旨在验证河口下方、内部及大西洋海域的地下水流动相关假说。当地及其他地区的海岸资源管理者均高度关注通过海底地下水排放进入近岸水域的营养物质，此类物质会引发水体富营养化与有害藻华。CRP可用于测量沉积物的电阻率，该物性参数对海底地下水的盐度差异具有显著敏感性。2004年与2006年的勘测分别采用了长度为100米与50米的漂浮式电阻率拖缆。该拖缆的探测深度约为其自身长度的20%，即100米拖缆的探测深度约20至25米，50米拖缆则约为12至14米。本次勘测所得数据均通过AGI公司的EarthImager 2D软件完成处理。