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<br />OOd~~ <br /> <br />toD <br /> <br />. <br />.. <br /> <br />THE MODULAR MODELING SYSTEM (MMS) - A MODELING FRAMEWORK FOR <br />MULTIDISCIPLINARY RESEARCH AND OPERATIONAL APPLICATIONS <br /> <br />G. H. Leavesley', P. 1. Restrep02, L. G. Stannard', L.A. Frankoski3, and A.M Sautins4 <br /> <br />, Hydrologist, U.S. Geological Survey, Box 25046, MS 412, Denver Federal <br />Center, Lakewood, CO 80225 <br /> <br />2Consulting Engineer, 1115 Hancock Drive, Boulder, CO 80303 <br /> <br />3 Research Assistant, University of Colorado, C~nter for Advanced Decision <br />Suppon for Water and Environmental Systems, Department of Civil Engineering, <br />Boulder, CO 80309 <br /> <br />4 Systems Engineer, University of Colorado, Center for Advanced Decision <br />Suppon for Water and Environmental Systems, Department of Civil Engineering, <br />Boulder, CO 80309. <br /> <br />Any use of trade, product, or firm names in this paper is for descriptive purposes <br />only and does not imply endorsement by the U.S. Government. <br /> <br />ABSlRACf <br /> <br />The Modular Modeling System (MMS) is an integrated system of computer software that is being <br />developed to provide the research and operational framework needed to suppon development, <br />testing, and evaluation of physical-process algorithms and to facilitate integration of user-selected <br />sets of algorithms into opemtional physical-process models. MMS uses a module library that <br />contains compatible modules for simulating a variety of water, energy, and biogeochemical <br />processes. A model is created by selectively coupling the most appropriate modules from the <br />library to create an "optimal" model for the desired application. Where existing modules do not <br />provide appropriate process algorithms, new modules can be developed. A geographic <br />information system (GIS) interface is being developed for MMS to facilitate model development, <br />application, and analysis. This interface permits application of a variety of GIS tools to <br />characterize the topographic, hydrologic, and biologic features of a physical system for use in a <br />variety of lumped- and disoibuted-parameter modeling approaches. MMS display capabilities <br />permit visualization of the spatial disoibution of model parameters and of the spatial and temporal <br />variation of simulated state variables during a model run. <br /> <br />INTRODUCTION <br /> <br />The interdisciplinary nature' and increasing complexity of environmental and water-resource' <br />problems require the use of modeling approaches that can incorPorate knowledge from a broad <br />range of scientific disciplines. Seiection of a model to address these problems is difficult given the <br />large number of available models and the potentially wide range of study objectives, data <br /> <br />1 <br />