NPS MODEL PARAMETER UNCERTAINTY ANALYSIS FOR AN OFF-STREAM RESERVOIR

Parameter uncertainties exert a significant effect on nonpoint source pollution (NPS) modeling results. A decision made on the basis of such results may thereby be inappropriate. In this work, the parameter unc ertainty is analyzed to explore an improved modeling procedure. Draina ge patterns generated from digital elevation data and rainfall are the major parameters examined. A case study for the watershed of the Posa n off-stream reservoir is implemented. A significant spatial variation of NPS distribution simulated with a drainage pattern generated from varied methods is observed. The effects of rainfall randomness on the spatial loading distribution are assessed and computed based on a Mont e Carlo simulation. The proposed procedure is capable of improving the quality of modeling results and the decision for an appropriate contr ol strategy.