潮汐河口大型中低滩促淤工程内部布局研究

The interior layout research of large-scale reclaiming projects in middle and low shallow beaches in tidal estuary

内部布局是决定促淤工程淤积效果优劣的重要因素之一,但以往缺乏对该问题的深入研究.以总规模约148.7 km2的长江口南汇东滩促淤圈围工程为例,以二维潮流数学模型及泥沙促淤效果经验公式为研究手段,展开潮汐河口大型中低滩促淤工程内部布局研究,包括促淤方式、分仓方式的选择以及纳潮口规模的拟定等.研究结果表明,纳潮口式促淤方式优于多仓布局方案,纳潮口规模在满足控制流速的前提下大小应适中.

Optimum selection of the schemes is one of the key problems in reclaiming projects in the middle and low shallow beaches. Therefore, the interior layout is very important in reclaiming projects. But there is lack of further research about interior layout which can determine reclaiming projects＇ deposition rate. Ta^king the reclaiming project （ total-scale is about 148.7 km2 ） along the east shore of Nanhui as the example, we studied some important issues such as methods of siltation promotion, choices of interior layout, scales of gaps, etc. , thus providing the basis for the layout of the reclaiming project in Nanhui and offering references for similar projects by means of 2-D numerical tidal models and empirical siltation promotion formulas. The research results show that the better way is to use the semi-open methods of siltation promotion and the multi-districts of interior layout with moderate-sealed gaps, and that the scale of gaps should meet the suitable velocity.