@prefix dcat: <http://www.w3.org/ns/dcat#> .
@prefix dct: <http://purl.org/dc/terms/> .
@prefix foaf: <http://xmlns.com/foaf/0.1/> .
@prefix gsp: <http://www.opengis.net/ont/geosparql#> .
@prefix locn: <http://www.w3.org/ns/locn#> .
@prefix vcard: <http://www.w3.org/2006/vcard/ns#> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .

<https://data.amerigeoss.org/dataset/38803595-3b5d-4025-bce8-1762c375747b> a dcat:Dataset ;
    dct:description """In 2016, the United States Geological Survey (USGS) began development of a 
regional-scale numerical model of the Long Island aquifer system, as part of the 
National Water Quality Assessment (NAWQA) Program. The three-dimensional 
groundwater-flow model was developed to evaluate 1) responses of the hydrologic 
system to changes in natural and anthropogenic hydraulic stresses 2) the subsurface 
distribution of groundwater age, and 3) the regional-scale distribution of groundwater 
travel times and the source of water to fresh surface waters and coastal receiving 
waters. The model also provides the groundwater flow components used to define 
model boundaries for possible inset models used for local-scale analyses.  
Unconsolidated sediments underlying the Island comprise a sole source aquifer 
that supplies water to about 2.9 million people in Nassau and Suffolk Counties; 
the aquifer also contributes groundwater discharge to freshwater and marine 
ecosystems. Anthropogenic activities have affected both the quantity and quality 
of groundwater, owing to the Islands large population and the generally unconfined 
conditions prevalent across the aquifer system. Groundwater withdrawals, particularly 
in the western part of the Island, have resulted in large declines in water-table altitude 
and in the landward movement of the freshwater/saltwater interface encroaching on 
local water supplies. Subsurface contamination emanating from numerous point 
sources, often associated with industrial sites in developed areas in western Long 
Island, adversely affect downgradient water supplies. In central and eastern Long 
Island, nutrients emanating from non-point sources associated with residential 
development and agricultural activities have degraded water quality in shallow 
parts of the aquifer. The model uses the numerical code MODFLOW-NWT to 
represent steady-state conditions for predevelopment and 2005-2015 average 
groundwater pumping and aquifer recharge. The particle-tracking algorithm 
MODPATH was used to simulate advective transport in the aquifer, to delineate 
the areas at the water table that contribute recharge to coastal and freshwater 
bodies, and to estimate total travel times of water from the water table to 
discharge locations. This USGS data release contains all of the input and output
 files for the simulations described in the associated model documentation 
report (https://doi.org/10.3133/sir20205091).""" ;
    dct:identifier "USGS:3ffd2a85-ad3f-4f32-a877-98f395ff46f0" ;
    dct:issued "2025-11-21T00:31:35.756066"^^xsd:dateTime ;
    dct:modified "20201207"^^xsd:gYear ;
    dct:publisher <https://data.amerigeoss.org/organization/727dbdd5-3f98-4ac0-9d28-5e344558139b> ;
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    dct:title "MODFLOW-NWT and MODPATH6 Models Used to Simulate Groundwater Flow in the Regional Aquifer System of Long Island, New York, for Pumping and Recharge Conditions in 2005-15" ;
    dcat:contactPoint [ a vcard:Organization ;
            vcard:fn "Donald A. Walter" ;
            vcard:hasEmail <mailto:dawalter@usgs.gov> ] ;
    dcat:distribution <https://data.amerigeoss.org/dataset/38803595-3b5d-4025-bce8-1762c375747b/resource/1c865c58-087f-42d2-994e-ff533c75fd4b>,
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        "ckan",
        "environment",
        "geo",
        "geoscientificinformation",
        "geoss",
        "groundwater",
        "groundwater-model",
        "inlandwaters",
        "kings-county",
        "long-island",
        "modflow-nwt",
        "modpath6",
        "nassau-county",
        "national",
        "new-york",
        "north-america",
        "particle-tracking",
        "queens-county",
        "suffolk-county",
        "united-states",
        "usgs-3ffd2a85-ad3f-4f32-a877-98f395ff46f0",
        "usgsgroundwatermodel" ;
    dcat:theme <%7Bgeospatial%7D> .

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    dct:issued "2022-08-07T10:01:35.698687"^^xsd:dateTime ;
    dct:modified "2025-11-21T00:31:35.743780"^^xsd:dateTime ;
    dct:title "Digital Data" ;
    dcat:accessURL <https://doi.org/10.5066/P9KWQSEJ> ;
    dcat:mediaType "application/http" .

<https://data.amerigeoss.org/dataset/38803595-3b5d-4025-bce8-1762c375747b/resource/aee1681b-8cd8-4a7a-bbc5-f39d7177bcc2> a dcat:Distribution ;
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    dct:title "Original Metadata" ;
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