| Title |
DEVELOPMENT OF A STOCHASTIC MULTICONSTITUENT MODEL FOR STEEP AND SHALLOW STREAMS OF KOREA |
| Abstract |
A stochastic multiconstituent model called STRESS (Segment Travel River Ecosystem Stochastic Simulation) was developed and validated in this study. The formulation. of STRESS is based on the moving segment approach in the Cell-In-Series(CIS) system where stream is assumed as a series of completely mixed flow reactors. The model was developed by incorporating Monte Carlo technique with the previously developed and validated determistic model called STREAM (Segment Travel River Ecosystem Autograph Model). STRESS was designed to be more representative of steep and shallow Streams with large variations of water quantity and quality which are typical in Korean peninsula. The model considers randomness in the head water, point source, non-point source conditions, and the travel time of water segment, and computes the frequency distributions, the mean values, and the standard deviations of the predicted water qualities. Major constituents included in STRESS are Dissolved Oxygen(DO), Biochemical Oxygen Demand(BOD), Suspended Solid(SS), Coliform Bacteria, Nitrogen Series, Phosphorus Series, and Phytoplankton. STRESS is executed on personal computer and designed for implementation with EGA/VGA color graphic. A demonstration application for the Tancheon, a tributary of the Han River, is presented to validate the stochastic nature of the model. The result indicated that STRESS could effectively simulate random variations of water qualities in steep and shallow streams. |