珠江口悬浮泥沙迁移数值模拟
Modeling of the transport of suspended solids in the Estuary of Zhujiang River
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摘要: 建立了珠江口海域三维悬浮泥沙的非饱和输沙数学模型,并与珠江口三维水动力斜压模型耦合,对悬沙迁移分布进行了模拟。模型由4个点的逐时实测含沙量过程进行了验证。各点模拟含沙量与实测含沙量吻合较好,表层分布与同期珠江口悬沙分布遥感图像基本一致.模拟结果表明,珠江口海域悬沙分布分层明显,河口附近水域大多为底层含沙量大于表层,但在盐淡水交汇处出现中层含沙量最小的情况总体上,自各个口门输出的泥沙受沿岸流作用向西南万向输送明显。大多数河口落潮时相对涨潮时含沙量等值线外移,反映珠江口水域悬浮泥沙主要来自河流。Abstract: A three-dimensional transport model of suspended solids in the Estuary of Zhujiang River is developed by coupling with the three-dimensional hydrodynamic model.The model is validated using the hourly measured data of sediment contents during 25-26, July 1999.The results show that model contents match well with the measured ones and the modeled distribution of top layer agrees with the remote sensing image of suspended solids in summer season.The modeled results show clear layers of the distribution of suspended solids in depth with larger sediment contents in the lower layers though in the interface of salt water and freshwater the lowest contents appear in middle layer.In a total view, the suspended solids inflowing from the 8 rivers transport southwestwards with the carry of strong coastal flow in the Estuary of Zhujiang River.Contours of sediment contents in the Estuary of Zhujiang River spread further to the out sea in the ebb tide than the flood tide, which reflects that suspended solids in the Estuary of Zhujiang River are terrigenous.
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Key words:
- Estuary of Zhujiang River /
- suspended solids /
- transport /
- three-dimensional model
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