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Coupled Ground-water and Surface-water FLOW model
Entry ID:
USGS_GSFLOW
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Summary
Abstract:
GSFLOW is a coupled Ground-water and Surface-water FLOW model based on the integration of the U.S. Geological Survey Precipitation-Runoff Modeling System (PRMS, Leavesley and others, 1983) and the U.S. Geological Survey Modular Ground-Water Flow Model (MODFLOW-2005, Harbaugh, 2005). In addition to the basic PRMS and MODFLOW simulation methods, several additional simulation methods were developed, and existing PRMS modules and MODFLOW packages were modified, to facilitate integration of the models. Methods were developed to route flow among the PRMS Hydrologic Response Units (HRUs), between HRUs and the MODFLOW finite-difference cells, and between HRUs and streams and lakes. PRMS and MODFLOW have similar modular programming methods, which allow for their integration while retaining independence that permits substitution of and extension with additional PRMS modules and MODFLOW packages. PRMS is implemented in the U.S. Geological Survey Modular Modeling System (Leavesley and others, 1996), which provides input and output and integration functions used by PRMS and GSFLOW modules.
GSFLOW was developed to simulate coupled ground-water/surface- water flow in one or more watersheds by simultaneously simulating flow across the land surface, within subsurface saturated and unsaturated materials, and within streams and lakes. Climate data consisting of measured or estimated precipitation, air temperature, and solar radiation, as well as ground-water stresses (such as withdrawals) and boundary conditions are the driving factors for a GSFLOW simulation. GSFLOW can be used to evaluate the effects of such factors as land-use change, climate variability, and ground-water withdrawals on surface and subsurface flow. The model incorporates well documented methods for simulating runoff and infiltration from precipitation; balancing energy and mass budgets of the plant canopy, snowpack, and soil zone; and simulating the interaction of surface water with ground water, in watersheds that range from a few square kilometers to several thousand square kilometers, and for time periods that range from months to several decades. An important aspect of GSFLOW is its ability to conserve water mass and to provide comprehensive water budgets.
GSFLOW allows for three simulation modes--integrated, PRMS-only, and MODFLOW-only. The capability of having PRMS-only and MODFLOW-only simulations in GSFLOW allows incremental model setup that provides flexibility in model calibration.
GSFLOW operates on a daily time step. In addition to the MODFLOW variable-length stress period used to specify changes in stress or boundary conditions, GSFLOW uses internal daily stress periods for adding recharge to the water table and calculating flows to streams and lakes. Only the first stress period specified in the MODFLOW input files can be designated as steady state for integrated simulations. No computations pertaining to PRMS are executed for an initial steady-state stress period.
[Summary provided by the USGS.]
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Service Citation
Originators:
Markstrom, S.L., Niswonger, R.G., Regan, R.S., Prudic, D.E., and Barlow, P.M.
Title:
Coupled Ground-water and Surface-water FLOW model
Release_Date:
2010-07-23
Provider:
U.S. Geological Survey
Edition:
1.1.4
URL:
http://water.usgs.gov/nrp/gwsoftware/gsflow/gsflow.html
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Use Constraints
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Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
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Distribution Media
Distribution_Media:
Online
Distribution_Size:
4.2 MB
Fees:
No fees
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Distribution_Media:
Online
Distribution_Size:
4.1 MB
Fees:
No fees
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Personnel
TYLER
B.
STEVENS
Role:
SERF AUTHOR
Phone:
(301) 614-6898
Fax:
301-614-5268
Email:
Tyler.B.Stevens at nasa.gov
Contact Address:
NASA Goddard Space Flight Center
Global Change Master Directory
City:
Greenbelt
Province or State:
MD
Postal Code:
20771
Country:
USA
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Publications/References
Harbaugh, A.W., 2005, MODFLOW-2005, the U.S. Geological Survey modular ground-water model--the Ground-Water Flow Process: U.S. Geological Survey Techniques and Methods 6-A16, variously paginated.
Leavesley, G.H., Lichty, R.W, Troutman, B.M., and Saindon, L.G., 1983, Precipitation-runoff modeling system--User's manual: U.S. Geological Survey Water-Resources Investigations Report 83-4238, 207 p.
Leavesley, G.H., Restrepo, P.J., Markstrom, S.L., Dixon, M., and Stannard, L.G., 1996, The Modular Modeling System (MMS): User's manual: U.S. Geological Survey Open-File Report 96-151, 142 p.
Creation and Review Dates
SERF Creation Date:
2008-05-28
SERF Last Revision Date:
2011-12-16
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