Item talk:Q320749

{

 "DOI": {
   "doi": "10.5066/p9yrdqsn",
   "identifiers": [],
   "creators": [
     {
       "name": "U.S. Geological Survey",
       "nameType": "Organizational",
       "affiliation": [],
       "nameIdentifiers": []
     }
   ],
   "titles": [
     {
       "title": "SEAWAT code used to couple MODFLOW and MT3DMS models, and supplemental data used to simulate groundwater flow and tritium transport from the HANDLEY underground nuclear test, Pahute Mesa, southern Nevada"
     }
   ],
   "publisher": "U.S. Geological Survey",
   "container": {},
   "publicationYear": 2021,
   "subjects": [
     {
       "subject": "MODFLOW, MT3DMS, PEST, groundwater model, transport model, tritium migration, HANDLEY, underground nuclear test,"
     }
   ],
   "contributors": [],
   "dates": [
     {
       "date": "2021",
       "dateType": "Issued"
     }
   ],
   "language": null,
   "types": {
     "ris": "GEN",
     "bibtex": "misc",
     "citeproc": "article",
     "schemaOrg": "CreativeWork",
     "resourceType": "Model",
     "resourceTypeGeneral": "Model"
   },
   "relatedIdentifiers": [
     {
       "relationType": "IsCitedBy",
       "relatedIdentifier": "10.3133/sir20215032",
       "relatedIdentifierType": "DOI"
     }
   ],
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   "version": null,
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   "descriptions": [
     {
       "description": "Three-dimensional numerical models were used to determine the permeable pathways between the HANDLEY underground nuclear test and downgradient boreholes ER-20-12 and PM-3, Pahute Mesa, southern Nevada. The SEAWAT code was used to couple MODFLOW and MT3DMS models, where the coupled model simulated groundwater-flow and tritium migration from the HANDLEY test for 50 years, from the date of detonation of the HANDLEY test (March 26, 1970) to March 26, 2020. Recharge, hydraulic-conductivity, specific-storage, and effective-porosity distributions were estimated using parameter estimation (PEST) by minimizing a weighted composite, sum-of-squares objective function. Simulated water-level altitudes in 10 wells, vertical water-level differences between 5 well pairs, aquifer-test transmissivity estimates in 9 wells, tritium concentrations in 7 wells, and drawdowns in wells PM-3-1 and PM-3-2 from groundwater withdrawals in borehole ER-20-12 were compared to measured equivalents during parameter estimation and formally defined the goodness-of-fit or improvement of calibration. This USGS data release contains data, analyses, and model files for the simulations and analyses described in the associated model documentation report (https://doi.org/10.3133/sir2021XXXX). Supplementary data and analyses are in the ancillary directory, including transmissivity estimates (Appendix A); water-level models to estimate drawdowns (Appendix B); tritium data (Appendix C); the modified hydrostratigraphic framework in the numerical models (Appendix D); effective-porosity estimates (Appendix E); the Pahute Mesa–Oasis Valley groundwater model (Appendix F); model-calibration files (Appendix G); and pre-processing routines to build model files (Appendix H). The numerical model was calibrated using a multi-model approach and a two-step process. First, the groundwater model was calibrated, which consists of (1) a steady-state model simulating steady-state (predevelopment) groundwater flow; and (2) a transient model simulating drawdowns from groundwater withdrawals during the drilling of borehole ER-20-12. A transport model was developed that uses the best-fit estimated hydraulic-conductivity field from the calibrated groundwater model and was used to estimate dispersion and effective porosities.",
       "descriptionType": "Abstract"
     }
   ],
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   "url": "https://www.sciencebase.gov/catalog/item/631405d9d34e36012efa3459",
   "contentUrl": null,
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   "source": "mds",
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   "created": "2021-06-16T21:30:55Z",
   "registered": "2021-06-16T21:30:57Z",
   "published": null,
   "updated": "2023-09-28T22:03:36Z"
 }

}