flomod(1) U.S. Geological Survey (wrdapp) flomod(1) NAME flomod - Finite-element surface-water model for two-dimensional flow in the horizontal plane ABSTRACT FLOMOD is part of a modular set of computer programs (FESWMS-2DH) that simulates two-dimensional, depth-integrated, surface-water flows. FESWMS-2DH consists of an input data preparation program (DINMOD), flow model (FLOMOD), simulation output analysis program (ANOMOD), and graphics conversion program (HPPLOT). The programs have been developed to analyze flow at bridge crossings where complicated hydraulic conditions exist, although they may be applied to many types of steady or unsteady flow problems. Shallow rivers, flood plains, estuaries, and coastal seas are examples of surface- water bodies in which flows may be essentially two-dimensional in the horizontal plane. The effects of bed friction and turbulent stresses are considered. Surface wind stresses and the Coriolis force are optionally considered. Flow through bridges and culverts can be modeled either as one-dimensional or two-dimensional flow. Both free-surface and confined two-dimensional flows through bridge openings may be simulated. The model is able to simulate flows with highly irregular topography and geometrical features, such as highway embankments and islands. METHOD FLOMOD may be used to simulate flow through bridge openings, over highway embankments, and through culverts at highway crossings of rivers, flood plains, or estuaries. The modeling system may be used to simulate many other steady and unsteady flow situations in which the flow variables are approximately uniform in the vertical direction. HISTORY Version 1.10.DG1 05/29/92 - Converted to run on Data General AViiON. Version 1.10 02/24/89 - FHWA official version, general code cleanup. Version 1.01 06/03/88 - Bug fixes. Version 1.00 01/01/88 - Initial version developed for the Federal Highway Administration, Offices of Research, Development, and Technology, by the U.S. Geological Survey. DATA REQUIREMENTS Data requirements include ground-surface elevations or water-body bathymetry, bridge and culvert dimensions, channel and overbank surface roughness, current velocity or flow rates, wind velocity, water temperature, and latitude. OUTPUT OPTIONS FLOMOD simulation results can be presented in the form of tabular reports and graphically in an X-window and HPGL format. 7 Jul 1998 1 flomod(1) U.S. Geological Survey (wrdapp) flomod(1) SYSTEM REQUIREMENTS FLOMOD is written in Fortran 77 with the following extensions: use of variable names longer than 6 characters, mixed character and non- character variables in common blocks, use of explicit length declarations (INTEGER*2, INTEGER*4, REAL*4), include files, and reference to compiler-dependent system date and time routines. Generally, the program is easily installed on most computer systems. The code has been used on UNIX-based computers. DOCUMENTATION Froehlich, D.C., 1989, HW031.D - Finite Element Surface-Water Modeling System: Two-Dimensional Flow in a Horizontal Plane--Users Manual: Federal Highway Administration Report FHWA- RD-88-177, 285 p. REFERENCES Lee, J.K., and Froehlich, D.C., 1989, HW031.X, research report: Federal Highway Administrative Report. Lee, J.K., Froehlich, D.C., Gilbert, J.J., and Wiche, G.J., 1983, A two-dimensional finite-element model study of backwater and flow distribution at the I-10 crossing of the Pearl River near Slidell, Louisiana: U.S. Geological Survey Water-Resources Investigations Report 82-4119, 66 p. Wiche, G.J., Gilbert, J.J., Froehlich, D.C., and Lee, J.K., 1988, Analysis of alternative modifications for reducing backwater at the Interstate Highway 10 crossing of the Pearl River near Slidell, Louisiana: U.S. Geological Survey Water-Supply Paper 2267, 54 p. CONTACTS Operation: U.S. Geological Survey Office of Surface Water Janice M. Fulford Building 2101 Stennis Space Center, MS 39529 jfulford@usgs.gov Distribution: U.S. Geological Survey Hydrologic Analysis Software Support Program 437 National Center Reston, VA 20192 h2osoft@usgs.gov Official versions of U.S. Geological Survey water-resources analysis software are available for electronic retrieval via the World Wide Web (WWW) at: http://water.usgs.gov/software/ 7 Jul 1998 2 flomod(1) U.S. Geological Survey (wrdapp) flomod(1) and via anonymous File Transfer Protocol (FTP) from: water.usgs.gov (path: /pub/software). The WWW page and anonymous FTP directory from which the FESWMS software can be retrieved are, respectively: http://water.usgs.gov/software/feswms.html --and-- /pub/software/surface_water/feswms The program and documentation are also available with limited support for a nominal fee from: The Center for Microcomputers in Transportation (McTrans) University of Florida 512 Weil Hall Gainesville, FL 32611 (352) 392-0378 SEE ALSO anomod(1) - FESWMS-2DH utility program to analyze simulation output dinmod(1) - FESWMS-2DH utility program to prepare data input hpplot(1) - FESWMS-2DH utility program to plot HPGL graphics file in an X window 7 Jul 1998 3