Mohamed M, Stednick J D, Smith F M
Faculty of Chemical and Natural Resources Engineering, Universiti Teknologi Malaysia, Skudai, Johor.
Water Sci Technol. 2002;46(9):47-54.
Some of the many tools used for watershed management are mathematical and computer models for wasteload allocations. QUAL2E is one of the most popular water quality models used for such purposes. The question arises as to whether the model is applicable in a different climate such as that in the tropics. In this study, QUAL2E was used to model Sg. Selangor River in Malaysia using the predictive equations for reaeration coefficient (k2) within the model and the measured reaeration coefficients for the river. The study results indicated that use of the reaeration coefficient (k2) measured at Sg. Selangor River did give the lowest standard error (SE) for the simulation of water quality during the 7Q10 low-flow period which is considered as the worst scene scenario in water quality modeling. But during calibration and validation using actual low-flow discharge data, the measured reaeration coefficients did not give the lowest standard error (SE). In conclusion, the results indicated that QUAL2E is applicable in tropical rivers when used with the modeled river parameters (i.e. hydraulic parameters, meteorological conditions etc.). Measured reaeration coefficients produced good results and several predictive equations also produced comparatively good results.
用于流域管理的众多工具中，有些是用于确定纳污能力的数学和计算机模型。QUAL2E是用于此类目的的最受欢迎的水质模型之一。问题在于该模型是否适用于不同的气候条件，比如热带地区的气候。在本研究中，利用QUAL2E模型中的复氧系数（k2）预测方程以及对马来西亚雪兰莪河实测的复氧系数，对雪兰莪河进行建模。研究结果表明，使用雪兰莪河实测的复氧系数（k2），在模拟被视为水质建模中最不利情景的7Q10枯水期水质时，确实给出了最低的标准误差（SE）。但在校准和使用实际枯水期流量数据进行验证时，实测的复氧系数并未给出最低的标准误差（SE）。总之，结果表明，当与建模的河流参数（即水力参数、气象条件等）一起使用时，QUAL2E适用于热带河流。实测的复氧系数产生了良好的结果，一些预测方程也产生了相对较好的结果。
