不同设计水文条件下近岸海域水环境容量的研究

Study on Coastal Water Environmental Capacity Under Different Design Hydrological Conditions

本文以珠海高栏港经济区近岸海域为例,应用MIKE 21软件建立了水动力与污染物输运数学模型,模型范围包括鸡啼门水道、虎跳门水道和崖门水道3条入海河流,并采用实测潮流和化学需氧量(COD)浓度对数学模型进行了验证。最后通过模型探讨了6种不同设计水文条件下水环境容量的差异。结果表明:情景1至情景4水文条件下计算的化学需氧量(COD)的总容量较为接近,分别为413.6 t、403.7 t、390.3 t、387.3 t,情景5和情景6水文条件下计算的化学需氧量(COD)的总容量较为接近,分别为234.9 t、193.6 t。由此可见,外海边界潮位数据对计算结果影响较大。

Taking coastal waters of Zhuhai Gaolan Port economic zone as an example,a hydrodynamic and pollutant transport model is first setup by the utilization of MIKE 21 software,and the model includes the Jitimen waterway,the Hutiaomen waterway and the Yamen waterway.Then the model is well verified by measured data of tidal current and concentration of Chemical Oxygen Demand(COD).Finally,the differences of water environmental capacity under six different design hydrological conditions are studied.The results indicate that the total capacity of COD calculated under the hydrological conditions of scenario 1 to scenario 4 is similar,which is 413.6t,403.7 t,390.3 t and 387.3 t respectively.The total capacity of COD calculated under the hydrological conditions of scenario 5 and scenario 6 is similar,which is 234.9 t and 193.6 t respectively.It follows that the outer sea boundary tidal level data has a great infl uence on the calculation results.