磨刀门外海拦门沙整治工程对咸潮入侵的影响

Influence of Barrier Bar Regulation Engineering of Modaomen Open Seas on the Salt Water Intrusion

基于FVCOM模型建立磨刀门海域盐度扩散数学模型,分析研究了磨刀门河口区盐水入侵情况。数值模拟结果与实测资料吻合较好,能够较好地反映珠江河口地区咸潮入侵的垂向分布规律,能够用于磨刀门海域拦门沙疏浚整治工程对咸潮入侵的影响研究。磨刀门海域盐度分布受海水、淡水共同控制,垂向盐度分层分布,并且底部产生高浓度咸潮入侵现象。口门区航道整治工程在一定程度上加剧了咸潮入侵,但对磨刀门水道沿岸地区居民及工农业取水环境不会产生较大影响;应对工程整治措施进行分析论证,最大限度减轻工程实施导致咸潮入侵的程度。

Based on FVCOM model,the three-dimensional salt water intrusion model in the Modaomen sea area was established,and the salt water intrusion in Modaomen sea area was analyzed and studied.The numerical simulation result is in good agreement with the measured data,and can reflect the law of salt water intrusion in the Modaomen sea.The salinity distribution is controlled by salt water and fresh water together,and the high concentrations salt water wedge phenomenon is produced at the bottom of the water.The salt water intrusion is increased after the waterway regulation project,but has a little effect on the coastal residents living,industrial and agricultural water environment.Engineering control measures should be analyzed,and maximally reduce the project's impact on saline water intrusion.