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Watershed Scale Nonpoint Source Pollution Models: Mathematical Bases

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

Citation:  Paper number  022091,  2002 ASAE Annual Meeting . (doi: 10.13031/2013.10398) @2002
Authors:   Deva K. Borah
Keywords:   Agriculture, agrochemical, hydrology, modeling, nonpoint source pollution, sediment, water quality, watershed

A clear understanding of a model is important for its appropriate use and avoiding of any misuse. In this study, eleven watershed-scale nonpoint-source pollution models were reviewed: SWAT, HSPF, AGNPS, AnnAGNPS, ANSWERS, ANSWERS-Continuous, PRMS, KINEROS, DWSM, CASC2D, and MIKE SHE. SWAT, HSPF, AnnAGNPS, and ANSWERS-Continuous are long-term continuous simulation models. AGNPS, ANSWERS, KINEROS, and DWSM are single rainfall event models. PRMS, CASC2D, and MIKE SHE have both the long-term and single event simulation capabilities. Mathematical bases of different components of these models were identified and compiled. In this paper, a preliminary summary of the compilation is presented in tabular forms. The flow governing equations and their solution methods used in each of these models are briefly discussed. Suitable temporal and spatial scales of these models are mentioned. The compilation of the mathematical bases of these models would be useful to determine the problems, situations, or conditions for which the models are most suitable, the accuracies and uncertainties expected, their full potential uses and limitations, and directions for their enhancements through combining each others strengths.

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