Dataset Identification:
Resource Abstract:
- description: This data set represents predicted nitrate concentration in shallow, recently recharged ground water, in milligrams
per liter, in the conterminous United States, and was generated by a national nonlinear regression model based on 16 input
parameters. Nolan and Hitt (2006) developed two national models to predict contamination of ground water by nonpoint sources
of nitrate. The nonlinear approach to national-scale Ground-WAter Vulnerability Assessment (GWAVA) uses components representing
nitrogen (N) sources, transport, and attenuation. One model (GWAVA-S) predicts nitrate contamination of shallow (typically
less than 5 meters deep), recently recharged ground water, which may or may not be used for drinking. The other (GWAVA-DW)
predicts ambient nitrate concentration in deeper supplies used for drinking. This data set is a national map of nitrate concentration
(in milligrams/liter) in shallow, recently recharged ground water as predicted by the GWAVA-S model. The data set is one of
17 spatial data sets (1 output data set and 16 input data sets) associated with the GWAVA-S model. Full details of the model
development are in Nolan and Hitt (2006). This data set represents the model output, which is depicted in figure 2 of Nolan
and Hitt (2006) that shows predicted nitrate concentration in milligrams per liter in shallow, recently recharged ground water.
The model results can be used to indicate areas of the Nation that may be vulnerable to nitrate contamination. For inputs
to the model, spatial attributes representing 16 nitrogen loading and transport and attenuation factors were compiled as raster
data sets (1-km by 1-km grid cell size) for the conterminous United States (see table 1). >Table 1.-- Parameters of nonlinear
regression model for nitrate in shallow > ground water (GWAVA-S) and corresponding input spatial data sets. > [kg, kilograms;
km2, square kilometers.] > >Nitrogen Source Factors Data Set Name > 1 farm fertilizer (kg/hectare) gwava-s_ffer >
2 confined manure (kg/hectare) gwava-s_conf > 3 orchards/vineyards (percent) gwava-s_orvi > 4 population density (people/km2)
gwava-s_popd > 5 cropland/pasture/fallow (percent) gwava-s_crpa > >Transport to Aquifer Factors > 6 water input
(km2/cm) gwava-s_wtin > 7 carbonate rocks (yes/no) gwava-s_crox > 8 basalt and volcanic rocks (yes/no) gwava-s_vrox
> 9 drainage ditch (km2) gwava-s_ddit > 10 slope (percent x 1000) gwava-s_slop > 11 glacial till (yes/no) gwava-s_gtil
> 12 clay sediment (percent x 1000) gwava-s_clay > >Attenuation Factors > 13 fresh surface water withdrawal gwava-s_swus
> for irrigation (megaliters/day) > 14 irrigation tailwater recovery (km2) gwava-s_twre > 15 histosol soil type (percent)
gwava-s_hist > 16 wetlands (percent) gwava-s_wetl "Farm fertilizer" is the average annual nitrogen input from
commercial fertilizer applied to agricultural lands, 1992-2001, in kilograms per hectare. "Confined manure" is the
average annual nitrogen input from confined animal manure, 1992 and 1997, in kilograms per hectare. "Orchards/vineyards"
is the percent of orchards/vineyards land cover classification. "Population density" is 1990 block group population
density, in people per square kilometer. "Cropland/pasture/fallow" is the percent of cropland/pasture/fallow land
cover classifications. "Water input" is the ratio of the total area of irrigated land to precipitation, in square
kilometers per centimeter. "Carbonate rocks" is the presence or absence of Valley and Ridge carbonate rocks. "Basalt
and volcanic rocks" is the presence or absence of basalt and volcanic rocks. "Drainage ditch" is the area of
National Resources Inventory surface drainage, field ditch conservation practice, in square kilometers. "Slope"
is the soil surface slope, in percent times 1000. "Glacial till" is the presence or absence of poorly sorted glacial
till east of the Rocky Mountains. "Clay sediment" is the amount of clay sediment in the soil, in percent times 1000.
"Fresh surface water withdrawal for irrigation" is the amount of fresh surface water withdrawal for irrigation,
in megaliters per day. "Irrigation tailwater recovery" is the area of National Resources Inventory irrigation system,
tailwater recovery conservation practice, in square kilometers. "Histosol soil type" is the amount of histosols
soil taxonomic order, in percent. "Wetlands" is the percent of woody wetlands and emergent herbaceous wetlands land
cover classifications. Reference cited: Nolan, B.T. and Hitt, K.J., 2006, Vulnerability of shallow ground water and drinking-water
wells to nitrate in the United States: Environmental Science and Technology, vol. 40, no. 24, pages 7834-7840.; abstract:
This data set represents predicted nitrate concentration in shallow, recently recharged ground water, in milligrams per liter,
in the conterminous United States, and was generated by a national nonlinear regression model based on 16 input parameters.
Nolan and Hitt (2006) developed two national models to predict contamination of ground water by nonpoint sources of nitrate.
The nonlinear approach to national-scale Ground-WAter Vulnerability Assessment (GWAVA) uses components representing nitrogen
(N) sources, transport, and attenuation. One model (GWAVA-S) predicts nitrate contamination of shallow (typically less than
5 meters deep), recently recharged ground water, which may or may not be used for drinking. The other (GWAVA-DW) predicts
ambient nitrate concentration in deeper supplies used for drinking. This data set is a national map of nitrate concentration
(in milligrams/liter) in shallow, recently recharged ground water as predicted by the GWAVA-S model. The data set is one of
17 spatial data sets (1 output data set and 16 input data sets) associated with the GWAVA-S model. Full details of the model
development are in Nolan and Hitt (2006). This data set represents the model output, which is depicted in figure 2 of Nolan
and Hitt (2006) that shows predicted nitrate concentration in milligrams per liter in shallow, recently recharged ground water.
The model results can be used to indicate areas of the Nation that may be vulnerable to nitrate contamination. For inputs
to the model, spatial attributes representing 16 nitrogen loading and transport and attenuation factors were compiled as raster
data sets (1-km by 1-km grid cell size) for the conterminous United States (see table 1). >Table 1.-- Parameters of nonlinear
regression model for nitrate in shallow > ground water (GWAVA-S) and corresponding input spatial data sets. > [kg, kilograms;
km2, square kilometers.] > >Nitrogen Source Factors Data Set Name > 1 farm fertilizer (kg/hectare) gwava-s_ffer >
2 confined manure (kg/hectare) gwava-s_conf > 3 orchards/vineyards (percent) gwava-s_orvi > 4 population density (people/km2)
gwava-s_popd > 5 cropland/pasture/fallow (percent) gwava-s_crpa > >Transport to Aquifer Factors > 6 water input
(km2/cm) gwava-s_wtin > 7 carbonate rocks (yes/no) gwava-s_crox > 8 basalt and volcanic rocks (yes/no) gwava-s_vrox
> 9 drainage ditch (km2) gwava-s_ddit > 10 slope (percent x 1000) gwava-s_slop > 11 glacial till (yes/no) gwava-s_gtil
> 12 clay sediment (percent x 1000) gwava-s_clay > >Attenuation Factors > 13 fresh surface water withdrawal gwava-s_swus
> for irrigation (megaliters/day) > 14 irrigation tailwater recovery (km2) gwava-s_twre > 15 histosol soil type (percent)
gwava-s_hist > 16 wetlands (percent) gwava-s_wetl "Farm fertilizer" is the average annual nitrogen input from
commercial fertilizer applied to agricultural lands, 1992-2001, in kilograms per hectare. "Confined manure" is the
average annual nitrogen input from confined animal manure, 1992 and 1997, in kilograms per hectare. "Orchards/vineyards"
is the percent of orchards/vineyards land cover classification. "Population density" is 1990 block group population
density, in people per square kilometer. "Cropland/pasture/fallow" is the percent of cropland/pasture/fallow land
cover classifications. "Water input" is the ratio of the total area of irrigated land to precipitation, in square
kilometers per centimeter. "Carbonate rocks" is the presence or absence of Valley and Ridge carbonate rocks. "Basalt
and volcanic rocks" is the presence or absence of basalt and volcanic rocks. "Drainage ditch" is the area of
National Resources Inventory surface drainage, field ditch conservation practice, in square kilometers. "Slope"
is the soil surface slope, in percent times 1000. "Glacial till" is the presence or absence of poorly sorted glacial
till east of the Rocky Mountains. "Clay sediment" is the amount of clay sediment in the soil, in percent times 1000.
"Fresh surface water withdrawal for irrigation" is the amount of fresh surface water withdrawal for irrigation,
in megaliters per day. "Irrigation tailwater recovery" is the area of National Resources Inventory irrigation system,
tailwater recovery conservation practice, in square kilometers. "Histosol soil type" is the amount of histosols
soil taxonomic order, in percent. "Wetlands" is the percent of woody wetlands and emergent herbaceous wetlands land
cover classifications. Reference cited: Nolan, B.T. and Hitt, K.J., 2006, Vulnerability of shallow ground water and drinking-water
wells to nitrate in the United States: Environmental Science and Technology, vol. 40, no. 24, pages 7834-7840.
Citation
- Title Vulnerability of shallow ground water and drinking-water wells to nitrate in the United States: Model of predicted nitrate
concentration in shallow, recently recharged ground water -- Model output data set (gwava-s_out).
-
- creation Date
2018-05-21T11:07:37.939261
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Metadata data stamp:
2018-08-06T23:28:36Z
Resource Maintenance Information
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- notes: This metadata record was generated by an xslt transformation from a dc metadata record; Transform by Stephen M. Richard, based
on a transform by Damian Ulbricht. Run on 2018-08-06T23:28:36Z
Metadata contact
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pointOfContact
- organisation Name
CINERGI Metadata catalog
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- electronic Mail Address cinergi@sdsc.edu
Metadata language
eng
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utf8
Metadata standard for this record:
ISO 19139 Geographic Information - Metadata - Implementation Specification
standard version:
2007
Metadata record identifier:
urn:dciso:metadataabout:0468a2d5-df41-43b8-bc87-a75fc804f1a3
Metadata record format is ISO19139 XML (MD_Metadata)