Item talk:Q320756

{

 "DOI": {
   "doi": "10.5066/f770809v",
   "prefix": "10.5066",
   "suffix": "f770809v",
   "identifiers": [],
   "alternateIdentifiers": [],
   "creators": [
     {
       "name": "Misut, Paul",
       "nameType": "Personal",
       "givenName": "Paul",
       "familyName": "Misut",
       "affiliation": [],
       "nameIdentifiers": [
         {
           "schemeUri": "https://orcid.org",
           "nameIdentifier": "https://orcid.org/0000-0002-6502-5255",
           "nameIdentifierScheme": "ORCID"
         }
       ]
     }
   ],
   "titles": [
     {
       "title": "MODFLOW-2005 model archive for simulation of zones of groundwater contribution to wells south of the Naval Weapons Industrial Reserve Plant in Bethpage, New York"
     }
   ],
   "publisher": "U.S. Geological Survey",
   "container": {},
   "publicationYear": 2018,
   "subjects": [
     {
       "subject": "contaminant transport"
     }
   ],
   "contributors": [],
   "dates": [
     {
       "date": "2017",
       "dateType": "Created"
     },
     {
       "date": "2018",
       "dateType": "Issued"
     }
   ],
   "language": null,
   "types": {
     "ris": "GEN",
     "bibtex": "misc",
     "citeproc": "article",
     "schemaOrg": "CreativeWork",
     "resourceType": "Model",
     "resourceTypeGeneral": "Model"
   },
   "relatedIdentifiers": [
     {
       "relationType": "IsCitedBy",
       "relatedIdentifier": "10.3133/sir20175161",
       "relatedIdentifierType": "DOI"
     }
   ],
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   "descriptions": [
     {
       "description": "A steady-state three-dimensional groundwater-flow model that simulates present conditions was coupled with the particle-tracking program MODPATH to delineate zones of contribution to wells pumping from the Magothy aquifer near a chlorinated volatile organic compound plume. Because rates of advection within the coarse-grained sediments typically exceeded 0.1 feet per day, transport by dispersion and (or) diffusion was assumed to be negligible. Resulting zones of contribution are complex shapes, influenced by hydrogeologic features including confining beds and a basal gravel zone, and the interplay of nearby hydrologic stresses. The use of two particle tracking techniques identified zones of contribution to wells. Particles are backtracked from pumping well screens, and particles are forward tracked from the location of a VOC plume, as defined by surfaces of equal total volatile organic compound concentration. During five years or less, about 1 to 3 percent of particles backtracked from pumping wells within a focus area intersect the 5 ppb VOC plume shell indicating the vast majority of particles were not sourced from the plume. During five years or less, none of the particles backtracked from pumping wells do not intersect the 50 ppb VOC plume shell. Forward-tracking techniques identified the fate of water within the VOC plume after five years as it moves toward ultimate well capture and (or) discharge to model constant head and drain boundaries. Out of 4,813 forward tracked particles started within the 50 ppb VOC plume shell, one forward-tracked particle was captured by well N 8480. Out of 22,958 forward tracked particles started within the 5 ppb VOC plume shell, one hundred were captured by production wells (less than 1 percent). The subset of forward pathlines that represent well plume capture are similar in number and shape to those of backtracked pathlines. Model simulations were completed to assess uncertainties and improve understanding of how variability in hydraulic properties, pumpage rates, and maximum particle traveltime affect delineation of zones of contribution. By use of driller logs, a transitional probability approach generated nine alternative realizations of heterogeneity within the Magothy aquifer to assess uncertainty in model representation. Fine-grained sediments with low hydraulic conductivity were realized as laterally discontinuous, thickening towards the south, and comprising about 27 percent of the total aquifer volume within the transitional probability subgrid. Model simulations with alternative pumpage rates, and porosity terms, and alternative maximum particle traveltime were also used to demonstrate how the size and shape of zones of contribution may vary.",
       "descriptionType": "Abstract"
     }
   ],
   "geoLocations": [],
   "fundingReferences": [],
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