| 摘要: |
| 磨刀门是珠江的主要泄洪通道之一,径流分配居珠江三角洲八大口门之首。利用磨刀门1977年地形(大规模整治前)和2003年的地形,通过ECOMSED模型模拟了磨刀门海域洪枯季节水动力场,对潮流、余流、潮能通量特性进行了对比,发现整治后磨刀门水动力强度加大,而且流速滩槽分异明显,余流场与落潮流方向一致。20世纪70年代,余流自口门出来后在内海区右偏,现在磨刀门水道余流偏向西部浅滩;潮能通量密度加大,滩槽分布差异明显。 |
| 关键词: 磨刀门 数值模拟 潮能通量 潮流 |
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| 基金项目:国家重点基金资助项目(40331007);国家973计划资助项目(2002CB412407) |
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| Hydrodynamic numerical simulation during the rebuilding of Modaomen Estuary of the Pearl River |
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| Abstract: |
| The “modaomen” is the main passage to flood discharge of the zhujiang river, and its flow distribution was the top of the other passage of zhujiang river to the sea. Since the 1960’s, “modao men” has been greatly renovated by human activities. Base on the chart of modaomen underwater topography in 1977(before the river engineering) and 2003, through numerical simulation by use of ECOMSED ocean numerical model, both the hydrodynamic fields of modaomen in flood season and dried season are simulated, its tidal flow,residual flow and tidal energy flux have been analysed. The result shows that the hydrodynamic intensity in the eastern trough of Heng Zhou channel was amplified and the flow velocity in western shoal was low. Both the directions of the residual and ebb flow were identical in one tidal period. During the 1970’s, residual flow turned right when come out of the river mouth; Now the residual of modaomen turns to the western shoal. The depth and velocity are the main factors which determine the intensity of tidal energy. In the same location, along with the sediment filling up of the river bed, the tidal enery decreases. |
| Key words: modaomen numerical simulation tidal energy flux tidal current |
