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Groundwater and Surface Water Flow (GSFLOW) model files for the East River, Colorado

Creators: Rosemary Carroll, Richard Niswonger, Craig Ulrich ORCID, Charuleka Varadharajan ORCID, Erica Woodburn, Kenneth Williams

Year: 2023

DOI: 10.15485/1998576

License: CC-BY 4.0

Location: The East River (ER) is a snow‐dominated, headwater basin of the Upper Colorado River Basin (UCRB) located in the western United States. The ER is the designated testbed of Lawrence Berkeley National Laboratory's Watershed Function Scientific Focus Area (WFSFA). Through WFSFA, observational networks have been established to measure stream discharge and precipitation chemistry. The ER is considered representative of many snow‐dominated headwaters of the Rocky Mountains. The study domain encompasses nearly 85 square km, a 1.4‐km vertical drop in elevation (4,120 to 2,760 m) and pristine alpine, subalpine, montane, and riparian ecosystems. The ER contains high‐energy mountain streams to low‐energy meandering floodplains and is eroding primarily into the Cretaceous, carbon‐rich, marine shale of the Mancos Formation. Additional metadata on specific locations within the watershed are provided in the following related data package: Varadharajan C. et al. (2022) doi:10.15485/1660962

Temporal extent: 1987-10-01 to 2022-09-30

Bounding box: 38.880°N to 39.034°N, -107.050°W to -106.880°W

Publisher: ESS_DIVE

Tags: East River, Groundwater and Surface Water Flow (GSFLOW), warming, groundwater storage, streamflow, CATEGORICAL:NONE Groundwater Flux, Groundwater Level, Lithology, stream flow, Air Temperature, Alpine & Subalpine Ecology, Plant Biology, Hydrology & Watersheds, Snow & Ice, Groundwater, Geology & Tectonics, Soil Science, Weather & Atmospheric Science, Gunnison Basin, Research Programs

Description

The data package contains model input files and executables for the East River, Colorado (750 km2) located in the headwaters of the Upper Colorado River Basin. The code applied is the U.S. Geological Survey (USGS) Groundwater and Surface Water Flow (GSFLOW) model. A Readme.txt file provides instructions on how to download all files and and execute mode runs. The model contains a 100-m grid resolution to represent topographic complexity and a daily timestep accounts for energy and water partitioning between the snowpack, vegetation, soil zone and bedrock. The land surface model is dynamically linked to a three-dimensional groundwater flow model that allows for streamflow gaining and losing conditions. The groundwater model accounts for nine stratigraphic units and extends 400 m below land surface. Using this modeling framework we explore historical water budgets (water year 1987-2022) and the influence of seasonal warming and associated mechanisms driving groundwater declines and streamflow loss.

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