台州湾浅滩取土区方案优化研究*

采用潮流数学模型和地形冲淤预报模式相结合的方法,探讨台州湾浅滩取土区长宽比和不同的实施方案下对流场和航道冲淤的影响,为取土区的方案优化提供科学依据.研究表明:台州湾浅滩取土区开挖后对工程区附近的流场和地形冲淤变化的影响相对较大,取土区3 km以外的区域影响幅度显著减小.在取土区容积一定的情况下,长宽比和长深比越小,对大范围流场和椒江口主航道冲淤变化的影响越小；与全开挖方案相比,分仓开挖方案对航道淤积的影响可减少约30％左右.

Project optimization of borrow area in shoal of Taizhou bay

Based on the tidal flow mathematical model and erosion-deposition prediction model, we analyze the flow field variation and waterway siltation density to explore the effects under different ratios of length to width and implementation schemes for the borrow area in the shoal of Taizhou bay. It is shown that the variation amplitude of the flow field and waterway siltation density is relatively large on the engineering area after the borrow area is excavated, and that decreases significantly in the region 3km outside the borrow area. Under the condition of certain volume of the borrow area, the ratios of length to width and length to depth are smaller, and the amplitude of flow field variation and waterway siltation density is smaller. Compared with the full excavation schemes, the amplitude of the waterway siltation density can be reduced about 30% by the segmental excavation schemes. This research result may serve as reference for the planning and design of the borrow area.