Hydrodynamic of saltwater intrusion in the Modaomen waterway
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摘要: 为研究磨刀门水道咸潮上溯的动力特性，基于非结构网格海洋模型（Finite Volume Coastal Ocean Model，FVCOM），构建了覆盖珠江河口及其上游网河区的高分辨率三维斜压数值模型，采用实测资料对其进行率定和验证，并开展了咸潮上溯的数值模拟计算。根据计算结果和实测资料，对磨刀门水道大、中、小潮期间的盐淡水分层与混合特征、盐分物质的分层输移机制进行分析，探讨其咸潮上溯强度时空分布差异的原因。结果表明：小潮期，底层累积盐通量明显大于表层，净输移方向为陆向；大潮期，表层累积盐通量明显大于底层，净输移方向为海向；而平衡点一般出现于中潮期，这就是磨刀门水道咸潮上溯最强和最弱时刻分别出现于小潮和大潮后的中潮期的原因所在。Abstract: In order to study the hydrodynamic characteristics of saltwater intrusion in the Modaomen waterway, a three dimensional baroclinic numerical model with large scale and high-resolution grids, covering the entire upstream river network, the Pearl River estuary and its adjacent sea, was set up based on the Finite Volume Coastal Ocean Model (FVCOM) and then validated and calibrated against measured data. Numerical experiment of saltwater intrusion in the Modaomen waterway was carried out with this model. According to simulated results and measured data, the mechanisms of stratification, mixing and salt transportation during spring, moderate and neap tide were analyzed. Results show that the salt transportation in the Modaomen waterway is dominated by bottom high-salinity water and its net mass is landward during neap tide. However, it is dominated by surface low-salinity water and the net mass is seaward during flood tide. The balance of salt transportation will appear within moderate tide. As a result, the saltwater intrusion in the Modaomen waterway reaches its peak and nadir during the coming moderate tide after neap and flood tide respectively.
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Keywords:
- saltwater intrusion /
- numerical simulation /
- Pearl River estuary /
- Modaomen waterway /
- hydrodynamic
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