开阔水域海洋倾倒区选划的初步研究——以长江口深水航道治理三期工程疏浚物临时海洋倾倒区选划为例

A Preliminary Study on Selection and Designation of Dumping Areas at Sea in Open Water Area——Taking the Selection and Designation of Dumping Areas at Sea for the Changjiang River Estuary Deep Water Channel Regulation Project as an Example

在二维潮流场基础上,采用泥沙扩散方程和欧拉—拉格郎日质点漂移法对抛泥时泥沙的扩散和淤积进行模拟,从水动力条件角度对航道两侧的倾倒区选划进行研究,分析不同时段和不同倾倒区的淤积率、流失率和容量。以长江口深水航道口门外倾倒区选划为例,对文中提出的倾倒区选划方法进行验证,结果表明,本文提出的方法是合适的,可以作为在开阔水域选划倾倒区的基本方法。

In this paper, based on the two-dimensional tidal current field, the sediment diffusion equation and Euler-Lagrange particle drift method are used to simulate the sediment diffusion and siltation during the spoil disposal, and the Selection and designation of dumping areas off the Changjiang River estuary deepwater channel entrance are studied from the viewpoint of hydrodynamic force. The underwater topographic data observed during March 2004 to June 2005 are used to analyze the deposition rates, sediment loss rates and dumping capacities of different dumping areas in different time periods, and the demonstration of the selected dumping＂ areas are also made. It is shown from the study results that the dumping areas selected by this method are suitable, and this method can be used as the basic method for selecting and designating the dumping areas at sea in open water area.