SHIP NAVIGATION: ANSI Text File of the Navigation and Bathymetry Recorded by the Ship's Differential Global Positioning System (DGPS) in the Potomac River/Chesapeake Bay from Sept. 6 to Sept. 8, 2006 - USGS Cruise 06018

In order to test hypotheses about groundwater flow under and into Chesapeake Bay, geophysical surveys were conducted by U.S. Geological Survey (USGS) scientists on Chesapeake Bay and the Potomac River Estuary in September 2006. Chesapeake Bay resource managers are concerned about nutrients that are entering the estuary via submarine groundwater discharge, which are contributing to eutrophication. The USGS has performed many related studies in recent years to provide managers with information necessary to make informed decisions about this issue. The research carried out as part of the study described here was designed to help refine nutrient budgets for Chesapeake Bay by characterizing submarine groundwater flow and discharge of groundwater beneath part of the mainstem and a major tributary, the Potomac River Estuary.

为验证切萨皮克湾（Chesapeake Bay）下方及注入该湾的地下水流动相关假说，美国地质调查局（U.S. Geological Survey, USGS）的科研人员于2006年9月在切萨皮克湾及波托马克河河口（Potomac River Estuary）开展了地球物理勘测工作。切萨皮克湾的资源管理者高度关注通过海底地下水排泄（submarine groundwater discharge）进入河口的营养物质，此类物质会加剧水体富营养化（eutrophication）。近年来，美国地质调查局已开展多项相关研究，为管理者提供制定该议题相关审慎决策所需的必要信息。本项所述研究中的科研工作，旨在通过刻画切萨皮克湾主干河段及主要支流波托马克河河口部分区域的海底地下水流动与排泄特征，助力优化切萨皮克湾的营养盐收支（nutrient budgets）核算。