Abstract
QUAL2K model is used to simulate the water quality of Wei River and the verification results are analyzed in this paper. For the actual situation of pollution in Wei River Basin, COD, ammonia nitrogen and total phosphorus are chosen as indexes of water quality prediction. The degradation coefficient of them, being one important water quality parameter, is calculated as 0.2428, 0.1019 and 0.2554, respectively. Conduct parameter setting and compared with the measured values combining comprehensive one-dimensional water quality model formula, with the measured data, then make adjustments to get new degradation coefficient with the values are 0.3631, 0.2046 and 0.2545, respectively. The simulation results are verified and showed that the predicted values fit with the measured ones well, the relative errors of COD, ammonia nitrogen and total phosphorus concentration are within 10%, and the simulation effect is good.
Highlights
Water quality simulation is important to master the variation law of pollutants in water body, reduce the risk of water pollution and its loss, and ensure the water safety and water environment quality
QUAL2K model that evolved in QUAL2E is one of QUAL series models developed by the United States Environmental Protection Agency and applies to small and medium-sized dendritic rivers which mix well [2,3,4]
Guo et al [6] discussed water quality trends of the middle and lower reaches of Hanjiang River by QUAL2E and QUAL2K model with BOD as the predictor, and the results indicated that QUAL2K reflected the field data better than QUAL2E
Summary
Water quality simulation is important to master the variation law of pollutants in water body, reduce the risk of water pollution and its loss, and ensure the water safety and water environment quality. Research on water quality model is mainly in Europe and other developed countries where theoretical foundation and applied research of the model has been very mature [1]. While it starts relatively late, and is still in the exploratory stage of theoretical research and applications in China. In order to solve some water quality problems, Seok Soon Park et al [5] applied the above-mentioned two models to the Nakdong River, Korea and found simulated results of QUAL2K model was relatively more consistent with the measured values. To provide a scientific basis for reducing water pollution risk and its losses, this study chooses a typical reach of Wei River and uses QUAL2K model for its water quality simulation
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