https://data.amerigeoss.org/dataset/67243a7f-46ff-4843-91d0-1d583fd16d13
type: Dataset
description: An investigation of submarine aquifers adjacent to the Fire Island National Seashore and Long Island, New York, was conducted to assess the importance of submarine groundwater discharge (SGD) as a potential nonpoint source of nitrogen delivery to Great South Bay. More than 200 kilometers (km) of continuous resistivity profiling (CRP) data were collected to image the fresh-saline groundwater interface in sediments beneath the bay. In addition, groundwater sampling was performed at sites (1) along the northern shore of Great South Bay, particularly in Patchogue Bay, that were representative of the developed Long Island shoreline, and (2) at sites on and adjacent to Fire Island, a 50-km-long barrier island on the southern side of Great South Bay. Other field activities included sediment coring, stationary electrical resistivity profiling, and surveys of in-situ pore water conductivity. The onshore and offshore shallow hydrostratigraphy of the Great South Bay shorelines, particularly the presence and nature of submarine confining units, appears to exert primary control on the dimensions and chemistry of the submarine groundwater flow and discharge zones. Sediment coring has shown that the confining units commonly consist of drowned and buried peat layers likely deposited in salt marshes. Based on CRP data, low-salinity groundwater extends from 10 to 100 meters (m) offshore along much of the northern and southern shores of Great South Bay, especially off the mouths of tidal creeks, and beneath shallow flats to the north of Fire Island adjacent to modern salt marshes. Human modifications of much of the shoreline and nearshore areas along the northern shore of the bay, including filling of salt marshes, construction of bulkheads and piers, and dredging of navigation channels, has substantially altered the natural hydrogeology of the bay's shorelines by truncating confining units and increasing recharge near the shore in filled areas. Better understanding of the nature of S…
issued: 2025-11-22T08:33:15.917527
modified: 20200908
spatial: Location
title: Processed continuous resistivity profile (CRP) data below the sediment water interface from Great South Bay on Long Island, New York, collected by the U.S. Geological Survey from May 19 to May 22, 2008 (ALLGSB_RESBSED_MAY08.SHP)
contact point: Organization
  fn: VeeAnn A. Cross
keyword: agi-supersting
keyword: amerigeo
keyword: amerigeoss
keyword: bathymetry
keyword: ckan
keyword: cmgp
keyword: coastal-and-marine-geology-program
keyword: continuous-resistivity-profiling
keyword: crp
keyword: elevation
keyword: field-activity-number-2008-007-fa
keyword: fire-island
keyword: geo
keyword: geoscientificinformation
keyword: geospatial-datasets
keyword: geoss
keyword: great-south-bay
keyword: groundwater
keyword: info-bank-id-t-1-08-li
keyword: location
keyword: long-island
keyword: lowrance-gps
keyword: national
keyword: national-park-service
keyword: navigation
keyword: new-york
keyword: north-america
keyword: north-atlantic
keyword: nps
keyword: nps-boat
keyword: oceans
keyword: point-shapefile
keyword: processed-data
keyword: submarine-groundwater
keyword: suffolk-county
keyword: u-s-geological-survey
keyword: united-states
keyword: usgs
keyword: whcmsc
keyword: woods-hole-coastal-and-marine-science-center
theme: {geospatial}

Digital Data
type: Distribution
description: Landing page for access to the data
format: XML
issued: 2022-07-07T15:56:53.302399
modified: 2025-11-22T08:33:15.897712
access URL: https://pubs.usgs.gov/of/2011/1040/html/catalog.html
media type: application/http

Original Metadata
type: Distribution
description: The metadata original format
format: XML
issued: 2022-07-07T15:56:53.302388
modified: 2025-11-22T08:33:15.897291
access URL: https://data.usgs.gov/datacatalog/metadata/USGS.332ca9a3-50f4-48f6-a181-cf5bbdaf818e.xml
media type: text/xml

US Migrating
type: Agent