{"accessLevel": "public", "bureauCode": ["010:12"], "contactPoint": {"@type": "vcard:Contact", "fn": "Eric D. Swain", "hasEmail": "mailto:edswain@usgs.gov"}, "description": "The study of Whiting Field Naval Air Station, Milton Florida requires numerical modeling of the groundwater \nsystem to determine the fate of contaminants released at the air station in previous decades. The MODFLOW-NWT \nmodeling code (Niswonger and others, 2011) was applied for this purpose with field data defining a number of \ninputs including aquifer properties and timeseries. Lithologic logs were used to define aquifer material types \nand estimated hydraulic conductivities were redistributed based on these logs. Net recharge (precipitation \nminus evapotranspiration) is the primary flow input to the model and stream leakage is the primary flow output. \nThe resulting model simulation has a grid spacing of 100 feet with grid dimensions of 533 rows and 424 columns, \nwith 7 vertical layers. In order to better represent the flow transporting surficial contaminants to the water table, \nthe unsaturated zone flow (UZF) package (Niswonger and others, 2006) was implemented in MODFLOW-NWT \nto relate surficial recharge to water-table recharge. The simulation involved three warmup timesteps of 1000 \ndays each followed by 17 daily timesteps representing the transient simulation of June 24-July 10, 2017. \nSimulation results were evaluated by comparing simulated water-table elevations and stream leakage with \nmeasured values. Output values of interest include groundwater flow vectors in horizontal plane view and \nalong vertical transects in locations where contaminant transport could be occurring. Model-simulated velocity \nvectors were compared with a known benzene plume location to evaluate flow directions. At the northern part \nof the plume, the flow-vector magnitudes are small and the highest Benzene concentrations are seen in this \nrelatively stagnant area. Higher flow-vector magnitudes further to the south and southeast move the plume \ntowards a nearby creek. This USGS data release contains all of the input and output files for the simulations \ndescribed in the associated model documentation report (https://doi.org/10.3133/sir20215124).", "distribution": [{"@type": "dcat:Distribution", "accessURL": "https://doi.org/10.5066/P9M0OD8F", "description": "Landing page for access to the data", "format": "XML", "mediaType": "application/http", "title": "Digital Data"}, {"@type": "dcat:Distribution", "description": "The metadata original format", "downloadURL": "https://data.usgs.gov/datacatalog/metadata/USGS.9ea689b9-7253-4b59-b437-f659dab7eb2a.xml", "format": "XML", "mediaType": "text/xml", "title": "Original Metadata"}], "identifier": "http://datainventory.doi.gov/id/dataset/USGS_9ea689b9-7253-4b59-b437-f659dab7eb2a", "keyword": ["Biscayne Bay National Park", "Biscayne aquifer", "Everglades National Park", "Florida", "Grey Limestone aquifer", "Groundwater", "Groundwater Model", "InlandWaters", "MODFLOW-NWT", "Miami", "Miami-Dade County", "Monroe County", "USGS:9ea689b9-7253-4b59-b437-f659dab7eb2a", "contamination and pollution", "environment", "geoscientificInformation", "groundwater and surface-water interaction", "groundwater flow modeling", "inlandWaters", "unsaturated zone", "usgsgroundwatermodel"], "modified": "2021-12-10T00:00:00Z", "publisher": {"@type": "org:Organization", "name": "U.S. Geological Survey"}, "spatial": "-87.093610, 30.642912, -86.958391, 30.789302", "theme": ["geospatial"], "title": "MODFLOW simulator used to assess groundwater flow for the Whiting Field Naval Air Station, Milton, FL"}