伶仃洋水文特征与水质变化趋势分析

Characteristic of Lingdingyang Marine Environment

依据实测资料及有关文献资料研究伶仃洋水文特征、主要污染物入洋负荷量与水环境质量变化趋势。研究表明 :伶仃洋受地形、径流、潮汐等的综合作用 ,水动力条件十分复杂 ,不同水域有不同的水文特征 ;伶仃洋水下地形滩槽相间 ,总趋势为西北高 ,东南低 ,西部以径流沉积为主 ,东部以潮流冲刷为主 ;伶仃洋盐度、含沙量和主要污染物含量的分布基本与水下地形走势相吻合 ;伶仃洋水环境质量变化经历了四个过程 ,目前水环境质量较好 ,主要污染物是无机氮 ,其次是活性磷 。

Hydrologic features,load of main pollutants & Current condition of water quality are discussed by references and monitoring dates.Its characteristic is affected by topography,run off and tide.Its dynamic condition is very complicated Different water areas have different hydrologic features.The topography under the water of Lingdingyang is higher in the northwest than that in the southeast.The shoal alternates with the deep trough within the bay.The grade of the salt degree and the content of the mud and the main pollutions are same as the topography tendency.Current condition of water quality is fairly good.Inorganic nitrogen is first pollutant,and then phosphorus.Rich in nutrition of nitrogen and phosphorus become a more and more prominent problem.