| Title |
Applicability of Water Quality Models by Comparing Predicted and Field Data of the South Branch of Han River |
| Authors |
오경미 ; 조순행 ; 유희찬 ( Kyoung Mee Oh ; Soon Haing Cho ; Hee Chan Yoo ) |
| Abstract |
The purpose of this study is to investigate the applicability of water quality models which are commonly used for evaluation and prediction of water quality of stream and rivers in Korea. Three models, QUAL2E, WASP4 and STREAM, were used for comparison. Three different statistical methods were used to test the correlation between predicted results by model and field measurements. Field data were obtained from the south branch of Han River in between Chungju and Yangpyung. Parameters used for model comparison were DO, BOD, NH₃-N, NO₃-N, Org-P and Dis-P. The data predicted by QUAL2E generally showed better fit to the field data. However, this model can not predict the effect of highly polluted stream. Nitrogen and phosphorus data predicted by WASP4 were closer to the field data than those data predicted by other models, even though more input data were required to run WASP4. The main features of STREAM are ; 1) it can predict the change of DO concentration by bottom rooted plant and by denitrification. 2) it can be applied to predict the water quality of small stream rather than large river. From this study, it was found that all three models showed poor ability in predicting water quality change caused by nonpoint discharge. |