tributaries: Tributary Basin Underflow

In USGS-R/wrv: Wood River Valley Groundwater-Flow Model

Description

Location and average flow conditions for model boundaries in the major tributary canyons and upper part of the Wood River Valley, south-central Idaho.

Usage

tributaries

Format

An object of SpatialPolygonsDataFrame class containing a set of 22 Polygons and a data.frame with the following variable:

Name

tributary name

MinLSD

minimum land-surface datum (elevation) along the transect, in meters above the North American Vertical Datum of 1988 (NAVD 88).

BdrkDepth

mean saturated thickness along the transect line, in meters; estimated as the distance between the estimated water table and bedrock elevations.

TribWidth

width of the tributary canyon, or length of the transect line, in meters.

LandGrad

land surface elevation gradient perpendicular to the cross-sectional transect line, a dimensionless quantity.

K

hydraulic conductivity in meters per day.

SatArea

estimated saturated cross-sectional area, in square meters; its geometry is represented as the lower-half of an ellipse with width and height equal to TribWidth and BdrkDepth, respectively.

DarcyFlow

groundwater flow rate, in cubic meters per day, calculated using a Darcian analysis.

BasinArea

land-surface area defined by the basin above the cross-sectional transect line.

BasinAreaType

label that describes the relative basin size; where "big" indicates a basin area greater than 10 square miles (25.9 square kilometers), and "small" indicates a basin area that is less than this breakpoint value.

PrecipRate

mean precipitation rate within the basin area, in meters per day.

PrecipFlow

mean precipitation flow rate, in cubic meters per day, calculated by multiplying PrecipRate by BasinArea.

FlowRatio

ratio of darcy flow rate to precipitation flow rate, or DarcyFlow divided by PrecipFlow, a dimensionless quantity.

Flow

estimated average volumetric flow rate, in cubic meters per day.

Geographic coordinates are in units of meters, in conformance with the North American Datum of 1983 (NAD 83), and placed in the Idaho Transverse Mercator projection (IDTM).

Source

U.S. Geological Survey, accessed on July 2, 2015; a Keyhole Markup Language (KML) file created in Google Earth with polygons drawn by hand in areas of known specified flow boundaries. Transect lines are defined by the polygon boundaries within the extent of alluvium aquifer (see alluvium.extent dataset). The land surface gradient (LandGrad) was estimated from the land.surface dataset. Hydraulic conductivity (K) is the average of two geometric means of hydraulic conductivity in the unconfined aquifer taken from table 2 in Bartolino and Adkins (2012). The U.S. Geologic Survey StreamStats tool (Ries and others, 2004) was used to delineate the basin area (BasinArea) and estimate the precipitation rate (PrecipRate). See the appendix C. Package Dataset Creation for the R code used to calculate the flow estimates (Flow).

References

Bartolino, J.R., and Adkins, C.B., 2012, Hydrogeologic framework of the Wood River Valley aquifer system, south-central Idaho: U.S. Geological Survey Scientific Investigations Report 2012-5053, 46 p., available at https://pubs.usgs.gov/sir/2012/5053/.

Ries, K.G., Steeves, P.A., Coles, J.D., Rea, A.H., and Stewart, D.W., 2004, StreamStats–A U.S. Geological Survey web application for stream information: U.S. Geological Survey Fact Sheet FS-2004-3115, 4 p., available at https://pubs.er.usgs.gov/publication/fs20043115.

Examples

sp::plot(tributaries, border = "red")
sp::plot(alluvium.extent, add = TRUE)
str(tributaries@data)

USGS-R/wrv documentation built on June 30, 2020, 11:07 p.m.