@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/61f49531-fbff-42fa-931f-1cf66f0f905d> a dcat:Dataset ;
    dct:description """A numerical model was developed using MODFLOW-NWT and FloPy to simulate groundwater flow and 
demonstrate a practical method for incorporating repeat microgravity observations (i.e., small changes in 
the acceleration due to Earth’s gravity) as a new type of calibration target for groundwater-flow models. 
The single-layer, 250-m cell size model was kept relatively simple to focus on the value of repeat microgravity 
data in the East Mesa area of the Imperial Valley, in the vicinity of the All American Canal, southeast 
California, USA. The method is demonstrated with repeat microgravity data collected over a 10-year period 
following the lining of the All American Canal with concrete. This lining of the canal resulted in the removal 
of a large source of seepage (recharge) causing groundwater levels, groundwater storage, and gravity all 
to declined considerably. The study area and field data are used to demonstrate a novel forward gravity 
modeling application linked to MODFLOW input and output files. The analysis demonstrates that including 
gravity data, compared to drawdown data alone, improves model parameter identifiability and reduces 
uncertainty in parameter estimates. This USGS data release contains all of the input and output files for the 
simulations described in the associated journal article (https://doi.org/10.1111/gwat.13167).""" ;
    dct:identifier "USGS:79e2e22d-b0cb-4b3b-a9a5-d9f32f679d22" ;
    dct:issued "2025-11-22T04:31:09.407631"^^xsd:dateTime ;
    dct:modified "20220105"^^xsd:gYear ;
    dct:publisher <https://data.amerigeoss.org/organization/727dbdd5-3f98-4ac0-9d28-5e344558139b> ;
    dct:spatial [ a dct:Location ;
            locn:geometry "POLYGON ((-115.3400 32.5700, -115.3400 33.0823, -114.6039 33.0823, -114.6039 32.5700, -115.3400 32.5700))"^^gsp:wktLiteral ] ;
    dct:title "MODFLOW-NWT groundwater model demonstrating groundwater model calibration with repeat microgravity measurements" ;
    dcat:contactPoint [ a vcard:Organization ;
            vcard:fn "Jeffrey Kennedy" ;
            vcard:hasEmail <mailto:jkennedy@usgs.gov> ] ;
    dcat:distribution <https://data.amerigeoss.org/dataset/61f49531-fbff-42fa-931f-1cf66f0f905d/resource/88670c01-2782-497d-ae47-410fca651a49>,
        <https://data.amerigeoss.org/dataset/61f49531-fbff-42fa-931f-1cf66f0f905d/resource/92a1a2f4-1a10-4506-b50a-f34c9e7bd990> ;
    dcat:keyword "algodones-dunes",
        "amerigeo",
        "amerigeoss",
        "arizona-water-science-center",
        "california",
        "ckan",
        "colorado-river",
        "environment",
        "geo",
        "geoscientificinformation",
        "geoss",
        "groundwater",
        "groundwater-model",
        "imperial-county",
        "imperial-valley",
        "inlandwaters",
        "location",
        "modflow-nwt",
        "national",
        "north-america",
        "pest",
        "repeat-microgravity",
        "southwest-gravity-program",
        "united-states",
        "usgs-79e2e22d-b0cb-4b3b-a9a5-d9f32f679d22",
        "usgsgroundwatermodel" ;
    dcat:theme <%7Bgeospatial%7D> .

<https://data.amerigeoss.org/dataset/61f49531-fbff-42fa-931f-1cf66f0f905d/resource/88670c01-2782-497d-ae47-410fca651a49> a dcat:Distribution ;
    dct:description "The metadata original format" ;
    dct:format "XML" ;
    dct:issued "2022-07-28T20:29:44.880788"^^xsd:dateTime ;
    dct:modified "2025-11-22T04:31:09.393155"^^xsd:dateTime ;
    dct:title "Original Metadata" ;
    dcat:accessURL <https://data.usgs.gov/datacatalog/metadata/USGS.79e2e22d-b0cb-4b3b-a9a5-d9f32f679d22.xml> ;
    dcat:mediaType "text/xml" .

<https://data.amerigeoss.org/dataset/61f49531-fbff-42fa-931f-1cf66f0f905d/resource/92a1a2f4-1a10-4506-b50a-f34c9e7bd990> a dcat:Distribution ;
    dct:description "Landing page for access to the data" ;
    dct:format "XML" ;
    dct:issued "2022-07-28T20:29:44.880794"^^xsd:dateTime ;
    dct:modified "2025-11-22T04:31:09.393580"^^xsd:dateTime ;
    dct:title "Digital Data" ;
    dcat:accessURL <https://doi.org/10.5066/P9575C61> ;
    dcat:mediaType "application/http" .

<https://data.amerigeoss.org/organization/727dbdd5-3f98-4ac0-9d28-5e344558139b> a foaf:Agent ;
    foaf:name "US Migrating" .