Abstract
A distributed-parameter model was developed to simulate water and nutrient runoff from various point and non-point sources in an urbanizing watershed, Zuibaiji River Watershed. The model was calibrated and validated with field-measured data of the years 2009 and 2010 respectively. The performances of the model for simulating hourly runoff for the calibration and validation periods were good with the Nash-Sutcliffe simulation coefficients of 0.60 and 0.55 and the relative errors of 27% and 30% respectively. The model also simulated daily TN and TP concentrations reasonably well for both calibration and validation periods. It was implied that the runoff loads from septic tanks and livestock farms were dominant factors of nutrient sources in the watershed. The scenario analyses showed that reduction of runoff loads from septic tanks and livestock farms were effective as watershed management strategies.
