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<br />., <br /> <br />'~ <br /> <br />number of model execution options such as a basic run, a run with a graphical and/or a spatial <br />visualization output, a run with ESP,.an optimization, or a sensitivity analysis, and (3) select a <br />variety of statistical and graphical analyses of simulation output. <br /> <br />Reviewing and editing of model parameters is accomplished through the use of a <br />spreadsheet-type interface. Spreadsheets are selected as a function of the indices used in defining <br />the spatial or temporal distribution of groups of parameters. For example, one spreadsheet might <br />use the index of months to display the parameters that are defined as varying by month. Another <br />spreadsheet might use the index of spatial basin subareas to display the parameters that are <br />defined for each subarea. Spreadsheets are also available to suppon 2-dimensional parameters <br />that, for example, might change monthly for each basin subarea. Pointing and clicking on the <br />parameter name in the spreadsheet opens a help window that displays the definition information <br />that was included in the declparam statement for the selected parameter. <br /> <br />One MMS graphical tool permits the use of up to four graphical display windows in which <br />the user can display, during a model run, any of the variables that have been declared in a declvar <br />, statement. As many as 10 variables can be displayed in each window and plotted results can be <br />oU,tput in HPGL or PostScript formats either to a digital file or to a printer. <br /> <br />GIS INTERFACE <br /> <br />A geographic information system (GIS) interface is being developed to provide tools for the <br />analysis and manipulation of spatial data in the pre-process, model, and post-process components <br />of MMS. The GIS currently being used is the Geographical Resources Analysis Suppon System <br />(GRASS) developed by the U.S. Army Corps of Engineers (1991). This interface permits the <br />coupling of a variety of GIS tools to characterize the topographic, hydrologic, and other physical <br />features of a watershed for use in a variety of lumped- or distributed-parameter modeling <br />approaches. <br /> <br />In the pre-process component, the GIS interface is accessed through a GRASS shell <br />screen which the user operates through a set of pull-down menus. The menus provide access to <br />frequently used GRASS tools and other system GIS tools developed specifically for a variety of <br />modeling tasks. The functions provided include the ability to (l) display raster, vector, and site <br />maps, (2) create slope, aspect, and elevation maps, (3) delineate watershed subbasins, (4) <br />develop model input parameters and a parameter characterization table, and (5) generate an <br />MMS input parameter file. The,GRASS shell also provides flexibility to the interface by <br />allowing the user to execute any GRASS command. <br />. . <br />The delineation of basin subareas and the estimation of a range of physical and <br />hydrologic parameters for these subareas are major functions of the pre-process GIS tools. <br />These procedures use Digital Elevation Model (OEM) data for the delineation 'of watershed <br />boundaries and the generation of slope, aspect, and elevation maps. Digitai data bases foi' soils, <br />vegetation, geology, and other physical and hydrologic featUres provide additional information <br />that can be overlayed on the topographiccharilcterizatlon tor use in th.e estimation of parameter <br />.values for delineated basin subareas. Estimated parameter values can be written to MMS model <br />parameter files for direct use in a selected model: .. ..' ,c.'- . . .. <br /> <br />. , <br />. .' /t <br /> <br />6 <br />