Model-grid and hydraulic-property data arrays of the MULT package of the Central Valley Hydrologic Model
This digital dataset defines the model-grid and hydraulic-property data arrays of the Multiplier (MULT)
Package used in the transient hydrologic model of the Central Valley flow system. The MULT package
defines multiplier arrays for calculation of model-layer characteristics from parameter values. The Central
Valley encompasses an approximate 50,000 square-kilometer region of California. The complex hydrologic
system of the Central Valley is simulated using the USGS numerical modeling code, MODFLOW-FMP
(Schmid and others, 2006). This simulation is referred to here as the Central Valley Hydrologic Model
(CVHM) (Faunt, 2009). Utilizing MODFLOW-FMP, the CVHM simulates groundwater and surface-water
flow, irrigated agriculture, land subsidence, and other key processes in the Central Valley on a monthly
basis from 1961-2003. The total active modeled area is 20,334 square-miles on a finite-difference grid
comprising 441 rows and 98 columns. Slightly less than 50 percent of the cells are active. It has a uniform
horizontal discretization of 1x1 square mile and is oriented parallel to the valley axis, 34 degrees west of
north (Faunt, 2009). The MULT Package includes the percentage of coarse-grained deposits in each of
the 10 model layers, specific yield, and the altitudes of the tops of model layers 1-4. In order to better
characterize the aquifer-system deposits, lithologic data from approximately 8,500 drillers' logs of boreholes
ranging in depth from 12 to 3,000 feet below land surface were compiled and analyzed. The percentage of
coarse-grained sediment, or texture, then was computed for each 50-foot depth interval of the drillers' logs.
A 3-dimensional texture model was developed by interpolating the percentage of coarse-grained deposits
onto a 1-mile spatial grid at 50-foot depth intervals from land surface to 2,800 feet below land surface. The
specific yield data were extrapolated from the percentage of coarse-grained deposits in model layer 1. The
CVHM is the most recent regional-scale model of the Central Valley developed by the U.S. Geological
Survey (USGS). The CVHM was developed as part of the USGS Groundwater Resources Program
(see "Foreword", Chapter A, page iii, for details).
Complete Metadata
| accessLevel | public |
|---|---|
| bureauCode |
[
"010:12"
]
|
| contactPoint |
{
"fn": "Claudia C. Faunt",
"@type": "vcard:Contact",
"hasEmail": "mailto:ccfaunt@usgs.gov"
}
|
| description | This digital dataset defines the model-grid and hydraulic-property data arrays of the Multiplier (MULT) Package used in the transient hydrologic model of the Central Valley flow system. The MULT package defines multiplier arrays for calculation of model-layer characteristics from parameter values. The Central Valley encompasses an approximate 50,000 square-kilometer region of California. The complex hydrologic system of the Central Valley is simulated using the USGS numerical modeling code, MODFLOW-FMP (Schmid and others, 2006). This simulation is referred to here as the Central Valley Hydrologic Model (CVHM) (Faunt, 2009). Utilizing MODFLOW-FMP, the CVHM simulates groundwater and surface-water flow, irrigated agriculture, land subsidence, and other key processes in the Central Valley on a monthly basis from 1961-2003. The total active modeled area is 20,334 square-miles on a finite-difference grid comprising 441 rows and 98 columns. Slightly less than 50 percent of the cells are active. It has a uniform horizontal discretization of 1x1 square mile and is oriented parallel to the valley axis, 34 degrees west of north (Faunt, 2009). The MULT Package includes the percentage of coarse-grained deposits in each of the 10 model layers, specific yield, and the altitudes of the tops of model layers 1-4. In order to better characterize the aquifer-system deposits, lithologic data from approximately 8,500 drillers' logs of boreholes ranging in depth from 12 to 3,000 feet below land surface were compiled and analyzed. The percentage of coarse-grained sediment, or texture, then was computed for each 50-foot depth interval of the drillers' logs. A 3-dimensional texture model was developed by interpolating the percentage of coarse-grained deposits onto a 1-mile spatial grid at 50-foot depth intervals from land surface to 2,800 feet below land surface. The specific yield data were extrapolated from the percentage of coarse-grained deposits in model layer 1. The CVHM is the most recent regional-scale model of the Central Valley developed by the U.S. Geological Survey (USGS). The CVHM was developed as part of the USGS Groundwater Resources Program (see "Foreword", Chapter A, page iii, for details). |
| distribution |
[
{
"@type": "dcat:Distribution",
"title": "Digital Data",
"format": "XML",
"accessURL": "https://doi.org/10.5066/P9XPUC4V",
"mediaType": "application/http",
"description": "Landing page for access to the data"
},
{
"@type": "dcat:Distribution",
"title": "Original Metadata",
"format": "XML",
"mediaType": "text/xml",
"description": "The metadata original format",
"downloadURL": "https://data.usgs.gov/datacatalog/metadata/USGS.8ebfce27-53f9-416c-92a9-aee117353052.xml"
}
]
|
| identifier | http://datainventory.doi.gov/id/dataset/USGS_8ebfce27-53f9-416c-92a9-aee117353052 |
| keyword |
[
"Alameda County",
"Amador County",
"Butte County",
"CV-RASA",
"Calaveras County",
"California",
"Central Valley",
"Central Valley Aquifer",
"Central Valley Hydrologic Model",
"Central Valley, California",
"Colusa County",
"Contra Costa County",
"El Dorado County",
"Flow Model CVHM",
"Fresno County",
"Glenn County",
"Groundwater Availability of the Central Valley Aquifer",
"Humboldt County",
"Kern County",
"Kings County",
"Lake County",
"Madera County",
"Mariposa County",
"Mendocino County",
"Merced County",
"Monterey County",
"Napa County",
"Nevada County",
"Placer County",
"Sacramento County",
"Sacramento Valley",
"San Benito County",
"San Joaquin County",
"San Joaquin Valley",
"San Luis Obispo County",
"Santa Barbara County",
"Santa Clara County",
"Shasta County",
"Solano County",
"Sonoma County",
"Stanislaus County",
"Sutter County",
"Tehama County",
"Texture Model",
"Trinity County",
"Tulare County",
"Tuolumne County",
"USGS:8ebfce27-53f9-416c-92a9-aee117353052",
"Ventura County",
"Yolo County",
"Yuba County",
"environment",
"geoscientificInformation",
"groundwater",
"hydraulic head",
"hydrogeology",
"hydrology",
"inlandWaters",
"model"
]
|
| modified | 2020-11-17T00:00:00Z |
| publisher |
{
"name": "U.S. Geological Survey",
"@type": "org:Organization"
}
|
| spatial | -123.831528, 34.519871, -117.916328, 40.748631 |
| theme |
[
"Geospatial"
]
|
| title | Model-grid and hydraulic-property data arrays of the MULT package of the Central Valley Hydrologic Model |
