Temperature Normalized Enhanced Vegetation Index for Dixie Valley, Churchill County, Nevada
With increasing population growth and land-use change, urban
communities in the desert southwest are progressively looking to
remote basins to supplement existing water supplies. Recent
applications for groundwater appropriations from Dixie Valley, Nevada,
a primarily undeveloped basin neighboring the Carson Desert to the
east, have prompted a reevaluation of the quantity of naturally
discharging groundwater.The objective of this study was to develop
a new, independent estimate of groundwater discharge by
evapotranspiration (ET) from Dixie Valley using a combination of
eddy-covariance evapotranspiration measurements and multispectral
satellite imagery. Mean annual groundwater ET (ETg) was estimated
during October 2009-2011 at four eddy covariance sites. Two
sites were located in phreatophytic shrubland dominated by
greasewood and two were located on a playa. Estimates were scaled to
the basin level by combining remotely sensed imagery with field
reconnaissance and site-scale ETg estimates.The Enhanced Vegetation
Index (EVI) was calculated for 10 Landsat 5 Thematic mapper scenes
and combined with brightness temperature in an effort to reduce
confounding (high) EVI values resulting from forbes and cheat grass
in sparsely vegetated areas, and biological soil crusts from bare soil
to densely vegetated areas. The resulting EVI/TB images represented
by this dataset were used to calculate ET units and scale actual
and potential ETg to the basin level.
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Complete Metadata
| @type | dcat:Dataset |
|---|---|
| accessLevel | public |
| bureauCode |
[ "010:12" ] |
| contactPoint |
{ "fn": "Nevada Water Science Center", "@type": "vcard:Contact", "hasEmail": "mailto:GS-W-NVcrs_Webmaster@usgs.gov" } |
| description | With increasing population growth and land-use change, urban communities in the desert southwest are progressively looking to remote basins to supplement existing water supplies. Recent applications for groundwater appropriations from Dixie Valley, Nevada, a primarily undeveloped basin neighboring the Carson Desert to the east, have prompted a reevaluation of the quantity of naturally discharging groundwater.The objective of this study was to develop a new, independent estimate of groundwater discharge by evapotranspiration (ET) from Dixie Valley using a combination of eddy-covariance evapotranspiration measurements and multispectral satellite imagery. Mean annual groundwater ET (ETg) was estimated during October 2009-2011 at four eddy covariance sites. Two sites were located in phreatophytic shrubland dominated by greasewood and two were located on a playa. Estimates were scaled to the basin level by combining remotely sensed imagery with field reconnaissance and site-scale ETg estimates.The Enhanced Vegetation Index (EVI) was calculated for 10 Landsat 5 Thematic mapper scenes and combined with brightness temperature in an effort to reduce confounding (high) EVI values resulting from forbes and cheat grass in sparsely vegetated areas, and biological soil crusts from bare soil to densely vegetated areas. The resulting EVI/TB images represented by this dataset were used to calculate ET units and scale actual and potential ETg to the basin level. |
| distribution |
[ { "@type": "dcat:Distribution", "title": "Digital Data", "format": "XML", "accessURL": "https://doi.org/10.5066/P9O1CWBD", "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.7eae176b-67a7-425f-b4dc-fe9330a9bf5e.xml" } ] |
| identifier | http://datainventory.doi.gov/id/dataset/USGS_7eae176b-67a7-425f-b4dc-fe9330a9bf5e |
| keyword |
[ "Churchill County", "Dixie Valley", "ET", "ET unit", "Evaporation", "Evapotranspiration", "Great Basin", "Groundwater", "Groundwater discharge", "Nevada", "Pershing County", "Phreatophyte", "Transpiration", "USGS:7eae176b-67a7-425f-b4dc-fe9330a9bf5e", "environment", "geoscientificInformation", "inlandWaters" ] |
| modified | 2020-11-17T00:00:00Z |
| publisher |
{ "name": "U.S. Geological Survey", "@type": "org:Organization" } |
| spatial | -118.161709, 39.627368, -117.583859, 40.155704 |
| theme |
[ "geospatial" ] |
| title | Temperature Normalized Enhanced Vegetation Index for Dixie Valley, Churchill County, Nevada |
