瓯江口航道治理工程水沙环境问题研究

基于现场实测资料,对瓯江口的水沙特征、冲淤演变、航道的淤积特点及原因进行了分析。建立了波浪潮流泥沙数学模型和台风骤淤数学模型对瓯江口航道二期治理工程正常航道年泥沙淤积和台风泥沙骤淤进行了计算,对其对周围水沙环境的影响进行了分析。研究结果表明：1）瓯江口航道二期治理工程对周围水沙环境的影响很小;2）瓯江口航道的泥沙淤积主要是大风骤淤,瓯江口航道治理二期工程方案可以通过控制三角沙达到航道减淤的目的,采用北导堤和三角沙西堤作为整治方案有明显的减淤效果。

Study on tidal current and sediment environments in Oujiang estuary caused by the entrance channel regulation project

This paper analyzes the features of tidal currents,sediment transport and seabed evolution and the causes of sediment siltation in the entrance channel of the Oujiang estuary based on in-situ data.A mathematical model of wave,tidal currents and sediment transport was developed to calculate the sediment siltation and sudden sedimentation caused by typhoon in the channel at the completion stage of phase II regulation project under normal year conditions and to evaluate the project’s impacts on hydrodynamic and sediment environments.The results show that the phase II project has little impact on its surrounding hydrodynamic and sediment environments and that sediment siltation in the channel are mainly caused by sudden sedimentation during rough climate such as typhoon.Actually this regulation project can reduce sediment siltation if the Sanjiaosha shoal is taken under control.The scheme of constructing the north jetty and west jetty on this shoal can produce an obvious effect in sedimentation reduction.