Excel Spreadsheet of the Geoprobe Results from the Nauset Marsh Area Collected August, 2005

In order to test hypotheses about groundwater flow under and into estuaries and the Atlantic Ocean, geophysical surveys, geophysical probing, submarine groundwater sampling, and sediment coring were conducted by U.S. Geological Survey (USGS) scientists at Cape Cod National Seashore (CCNS) from 2004 through 2006. Coastal resource managers at CCNS and elsewhere are concerned about nutrients that are entering coastal waters via submarine groundwater discharge, which are contributing to eutrophication and harmful algal blooms. The research carried out as part of the study described here was designed, in part, to help refine assumptions required by earlier versions of models about the nature of submarine groundwater flow and discharge at CCNS. This study was conducted in four phases, with a variety of field techniques and equipment employed in each phase. Phase 1 consisted of continuous resistivity profiling (CRP) surveys of the entire study area conducted in 2004. Phase 2 consisted of CRP ground-truthing via resistivity probe measurements and submarine groundwater sampling from hydraulically-drive piezometers using a barge in the Salt Pond/Nauset Marsh area in 2005. Phase 3 consisted of supplemental detailed CRP surveys in the Salt Pond/Nauset Marsh area in 2006. Finally, Phase 4 consisted of sediment coring and porewater extraction in the Salt Pond/Nauset Marsh area later in 2006 to supplement the 2005 sampling.

为验证有关河口及大西洋下方与内部地下水流动的科学假说，美国地质调查局（U.S. Geological Survey, USGS）的科研人员于2004年至2006年间，在科德角国家海岸（Cape Cod National Seashore, CCNS）开展了地球物理勘探、地球物理探测、海底地下水采样及沉积物取芯工作。科德角国家海岸及其他沿海区域的海岸资源管理者担忧，经海底地下水排放进入近岸水体的营养盐会引发富营养化与有害藻华。本项研究的相关工作在设计阶段便旨在辅助完善早期模型中针对科德角国家海岸海底地下水流动与排放特征的假设前提。本研究共分为四个阶段，各阶段均采用了多样化的野外技术与设备：第一阶段为2004年开展的覆盖全研究区域的连续电阻率剖面（continuous resistivity profiling, CRP）测量；第二阶段为2005年在盐池/诺塞特沼泽（Salt Pond/Nauset Marsh）区域，依托驳船通过液压驱动测压管开展电阻率探针探测与海底地下水采样的连续电阻率剖面实地验证工作；第三阶段为2006年在该区域开展的补充性高精度连续电阻率剖面测量；最后，第四阶段为2006年后期在盐池/诺塞特沼泽区域开展的沉积物取芯与孔隙水提取工作，以补充2005年的采样任务。