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该文采用非结构化有限体积近岸海洋三维模型FVCOM(Finite-Volume Coastal Ocean Model),建立了磨刀门水道至伶仃洋盐水入侵数值模型,模拟2004年、2005年及2007年枯季的长序列流场过程,观察其水动力特性,研究盐度的时空变化规律,分析其垂向分层现象。结果表明仅对该文模拟范围的建模也能达到模拟珠江四口门或八口门时磨刀门水道的准确度,从而减少了建模工作量和模型计算量。对三个工况的模拟显示盐水入侵最远距离在2005年1月最大,越过了全禄水厂,2007年3月最小。垂向分层方面,由于盐水上溯的最远距离均处于内河道处,盐度垂向分层不明显,底表层盐水最远入侵距离的差距随入侵距离的增加而减小。海平面平均每升高1 cm,磨刀门水道咸潮入侵平均上移距离为0.85 km。
In this paper, a numerical model of salt-water intrusion from Modaomen Channel to Lingding Ding Sea was established by using the unstructured Finite-Volume Coastal Ocean Model (FVCOM). The numerical simulation of the long dry season in 2004, 2005 and 2007 Sequence flow field process to observe the hydrodynamic characteristics of salinity spatial and temporal changes in the law to analyze the vertical stratification. The results show that the accuracy of modeling the simulation range of this paper can also be achieved by simulating the water gate of the Pearl River with four or eight gates, thus reducing the workload of modeling and the calculation of the model. Simulations on three conditions show that the maximum distance of salt water intrusion was the largest in January 2005, crossing the Quanshui water plant, the smallest in March 2007. In terms of vertical stratification, the salinity vertically stratified is not obvious because the furthest distance of salt water upstream is within the inland waterway, and the difference of the maximum intrusion distance of bottom surface saltwater decreases with the increase of intrusion distance. When the average sea level increases by 1 cm, the average distance moved by salt tidal invasion at Modaomen Channel is 0.85 km.