Surface-water quality and flow Modeling Interest Group
U.S. Geological Survey
12201 Sunrise Valley Drive, MS 415
Reston, VA 20192
Internet: hejobson@usgs.gov,
harbaugh@usgs.gov
Phone: (703) 648-5224, (703) 648-5615
FAX: (703) 648-5295
Citation:
Jobson, H.E. and Harbaugh, A.W., 1999, Modifications to the Diffusion Analogy
Surface-Water Flow Model (DAFLOW) for Coupling to the Modular Finite-Difference
Ground-Water Flow Model (MODFLOW), U.S. Geological Survey Open-File Report
99-217, 107 p.
The DAFLOW model routes flows through a system of inter-connected one-dimensional channels and subdivides the system into a series of branches, with each branch divided into a number of subreaches. MODFLOW simulates ground-water flow through a three-dimensional grid of cells. The models are coupled by adding an exchange between each subreach and a specified ground-water cell, with the amount of flow from the stream to ground water being limited to the available streamflow. The water exchange for each subreach is computed on the basis of the stream-aquifer head difference, the streambed thickness, stream width, and streambed hydraulic conductivity.
Three example applications are provided to assess the accuracy of the solutions and demonstrate the use of the combined models.
Download the full article (PDF, 355K).
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