Citation:

Coats, C., A. Hanna, D. Hwang, AND D.W. Byun. MODEL ENGINEERING CONCEPTS FOR AIR QUALITY MODELS IN AN INTEGRATED ENVIRONMENTAL MODELING SYSTEM. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/A-94/036.

Description:

Models 3 is an extensible environmental modeling system designed to meet the research and regulatory needs of the EPA and other users into the twenty-first century. s such, it must deal with a number of problems. hese problems include (1) the scientific correctness, flexibility, and usability required, (2) automating much of the complexity of planning, scheduling, and management of the computations associated with environmental studies and the massive volumes of data these studies produce, and (3) the software engineering issues associated with developing a modular, scalable, extensible family of air quality models to be provided by the Models-3 system to its users. his paper is concerned with the last of these, the model engineering problem. he primary focus of our efforts is on achieving the correct level of modularity. e wish to encapsulate the various processes relevant to air quality 4-into modules which act on the concentration field independently of one another, which have standardized interfaces to the driver program, and which make available new and additional data for analysis of process behavior and interactions, This encapsulation and independence will make it easier to upgrade modules to match increases in scientific understanding, and to introduce now additional modules. o support this independence, and to make modeling data available for analysis and visualization, we use self-describing data files currently implemented on top of UCAR's netCDF file format, and access methods stated in terms of the language of the scientist or modeler. e will present some of the results of implementing this modularity in a family of models emulating the RADM and the RADM Engineering Models.

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