西江河口咸潮入侵的输运机理研究

Study on Numerical Simulation of Transport Mechanisms of Saltwater Intrusion in Xijiang River Estuary

近年来,西江河口地区咸潮入侵的问题越发严峻,严重威胁人民的日常生活,故对河口咸潮咸水物质输运转移变化机理研究尤为重要。采用水动力学方法进行河道盐度的扩散演算,构建河网水质的数学模拟模型。在建模的基础上,用其模拟西江河口水流、盐度输运变化规律,并与实测水文资料进行对比。结果说明,模拟计算曲线与实测曲线相对一致,该模型具有适用性。该模型可用来预报西江河口咸潮入侵的影响时间、影响范围,数值模拟咸潮上溯的环境影响,进而提出应对和控制咸潮上溯的对策措施,实现对未来咸潮入侵过程的模拟,为河口咸潮入侵的预报与防治工作提供丰富的资料和可靠的技术支持。

In recent years, the issue of saline water intrusion in Xijiang river estuary is becoming increasingly serious, so the research on transport mechanisms of saltwater intrusion in estuary is particularly important. This paper had calculated the conflux of salinemotion to build a numerical water quality model by using hydrodynamics method. The model was applied to simulate and calculate the motion of water flow and saline in Xijiang river. Compared with the measured data, the results showed that the tally of computation and obser- vation was in a good agreement. The model could be used to forecast the saline motion process in Xijiang river estuary and could be widely applied in production practice via appropriate improvement. Ultimately, it couldsimulate the saltwater intrusion in the future process, which provided us with reliable data and technical support to forecast and prevent the saltwater intrusion in estuaries.