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Using A Domain-Specific Middleware System (DHARMA) to Extend WEPP Applicability to Large Watersheds

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:  Paper number  032358,  2003 ASAE Annual Meeting . (doi: 10.13031/2013.14986) @2003
Authors:   Kyunghyun Kim, Prasanta K. Kalita, Daniel Andresen
Keywords:   DHARMA, WEPP model, soil erosion, hydrology

Physically based hydrologic models are limited to watershed size not only because of their modeling scales but also due to the limits of current computational resources. To overcome these limitations, a new-sophisticated computational management system called DHARMA has been developed. This domain-specific middleware system has made it possible to apply WEPP erosion model to a large watershed, Lake Decatur Watershed (925 mile2) in Illinois. In the DHARMA system, each hillslope is considered as a unit of parallel computation. A simulation will be performed with more than two thousands of hillslopes composing the entire watershed and a channel network connecting each hillslope (which was impossible due to current computational technology). Flow rate data from 7 gage stations across the watershed will be used to calibrate the model. Due to generic nature of the system, any model simulation can be added into the system with only limited modification. In this paper, we discussed the evolving software architecture of DHARMA and the data development for the entire Lake Decatur watershed.

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