围滩吹填工程对水环境的影响分析

Effects of enclosing-bank and hydraulic fill projects on water environment

以江苏省苏州太仓港口开发为例,研究涉水工程所造成的水环境和生态问题,包括对水质、河势和水生群落的影响。泥沙测验结果表明,泥沙含量在局部地区偏高,而施工区附近距岸约80m处水域含沙量与工程所在江段平均含沙量为相同的数量级;采用数学模型模拟了污染物的扩散,CODCr的最大影响污染带范围为排污口以下14m,石油类浓度增量值0 01mg/L的分布范围为排污口以下6m;采沙区附近局部区域流态有所变化,该江段的总体流态基本不发生变化;工程对水生生物有一定程度的影响。

Taking the exploitation of the harbor in Taicang City of Jiangsu Province as an example, water environment pollution and ecological problems caused by near-shore projects are studied, including the impacts on water quality, river regime and aquatic community. The sediment experiment indicates that the concentration of sediments is a little greater in some places than others, whereas in the water area of 80 meters away from the bank, it is almost the same magnitude as the average concentration where the project locates. The diffusion of contaminations is simulated with mathematical models. The largest diffusing distance of COD_(Cr)is 14 meters downstream of the pollution discharge site, and the distribution range of petroleum with a concentration increment of 0.01?mg/L extends 6 meters downstream. The flow regime near the area where sediments are exploited changes a little, while, in the whole river, it is hardly altered. The project has impacts on aquatic organisms, but it is not remarkable.