Processed continuous resistivity profile data collected in Manhasset Bay on Long Island, New York on May 17, 2008

• Main Authors: John F. Bratton, VeeAnn A. Cross
• Format: Dataset
• Language: unknown
• Published: USGS Science Data Catalog 2012
• Subjects: U.S. Geological Survey; USGS; Coastal and Marine Geology Program; CMGP; Woods Hole Coastal and Marine Science Center; WHCMSC; Field Activity Number 2008-007-FA; Info Bank ID T-1-08-LI; navigation; bathymetry; Continuous Resistivity Profiling; CRP; R/V Terrapin; Lowrance GPS; AGI SuperSting; processed data; groundwater; submarine groundwater; elevation; location; oceans; geoscientificInformation; North America; North Atlantic; United States; New York; Long Island; Manhasset Bay; Nassau County; Long Island Sound; Terrapin
• Online Access: https://search.dataone.org/view/3562d371-42ba-48b6-9994-2960c318d5cc

An investigation of coastal groundwater systems was performed along the north shore of Long Island, New York during May 2008 to constrain nutrient delivery to Northport Harbor and Manhasset Bay by delineating locations of likely groundwater discharge. The embayments are bounded by steep moraines and are underlain by thick fine-grained sediments deposited in proglacial lakes during the last ice age. Beach sand and gravel overlie the glacial deposits along the coast. The continuous resistivity profiling (CRP) surveys that were conducted indicate the existence of low-salinity groundwater in shore-parallel bands, typically 25 to 50 meters wide, along the shorelines of both bays. Piezometer sampling and seepage meter deployments in intertidal and subtidal areas of the two bays confirmed the presence and discharge of brackish and low-salinity groundwater. The large tidal ranges (up to 3 meters), and the steep onshore topography and hydraulic gradients are important variables controlling coastal groundwater discharge in these areas. For more information on the survey involved in this project, see https://cmgds.marine.usgs.gov/fan_info.php?fan=2008-007-FA.