Processed Continuous Resistivity Profiles Collected in the Neuse River, May 5, 2005

The Neuse River Estuary in North Carolina is a broad, V-shaped water body located on the southwestern end of Pamlico Sound. This estuary suffers from severe eutrophication for which several water quality models have recently been developed to aid in the management of nutrient loading to the estuary. In an effort to help constrain model estimates of the fraction of nutrients delivered by direct ground-water discharge, continuous resistivity profile (CRP) measurements were made during the spring of 2004 and 2005. CRP is used to measure electrical resistivity of sediments, a property that is sensitive to difference in salinity of submarine ground water. The 2004 and 2005 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. CRP data enables the mapping of the extent and depth of the fresher ground water within the estuary.

位于北卡罗来纳州的纽斯河河口（Neuse River Estuary）是帕姆利科湾（Pamlico Sound）西南端的宽阔V型水体。该河口面临严重的富营养化问题，近年已有多款水质模型被开发，用于辅助管控该河口的营养盐负荷。为约束直接地下水排放所携带营养盐占比的模型估算精度，研究团队于2004年与2005年春季开展了连续电阻率剖面（continuous resistivity profile, CRP）测量。CRP可用于检测沉积物的电阻率，该物性参数对海底地下水的盐度差异敏感。2004年与2005年的勘测分别使用了长度为100米和50米的漂浮式电阻率拖缆。拖缆的探测深度约为其自身长度的20%，对应100米拖缆的探测深度约20-25米，50米拖缆则为12-14米。上述数据采用AGI公司的EarthImager 2D软件进行处理。CRP数据可用于绘制河口内低盐地下水的分布范围与埋藏深度。