温州浅滩二期围涂开发对瓯江河口演变的影响分析

The second phase reclamation of Wenzhou shoal and its impact on the evolution of Qujiang river estuary

围涂开发势必改变河口水域的潮流动力条件,系统分析围涂开发对河口冲淤演变的影响,能为工程的科学决策提供有力的技术支撑。本文介绍了温州浅滩泥沙淤积环境特性,分析了温州浅滩二期围涂开发对瓯江河口冲淤演变的影响。研究表明:温州浅滩的走向与瓯江南、北口潮流的主方向基本一致,围涂开发将局部改变河口的潮流动力,不会强制改变瓯江河口潮流的动力轴线,不会引起其潮流结构的总体调整,围涂开发符合河口自身演变规律;同时,温州浅滩二期围涂区域总体呈冲淤动态平衡状态,开发应采取必要的工程促淤措施,防止局部冲刷的不利影响。

Tidal flats reclamation changes the dynamic conditions of a tidal estuary and an analysis of the reclamation impacts on the estuary evolution is often needed to make a scientific project decision.This paper describes the sediment transport conditions of Wenzhou shoal and shows the following impacts of Wenzhou shoal reclamation on the estuary evolution.First,with the tidal flat along the main flow directions of the south and north estuary branches,the reclamation only causes local changes in tidal dynamics and no change in either the dynamic center or the main flow structure of the estuary,so it is consistent with the natural evolution.Second,for the second-stage reclamation,the sediment transport near the tidal flat is nearly in equilibrium and it is necessary to enhance the deposition and prevent erosion.Moreover,further study is needed to understand the impact on the estuary ecological environments.