基于PCA法的沉积物质量评价模型构建及其应用

Establishment and application of sediment quality assessment model based on PCA method

本研究针对我国沉积物质量评价存在的问题,基于近海沉积物监测常规指标和海洋沉积物质量标准,结合主成分分析法(PCA)构建了沉积物质量的评价指标体系和数学模型,划分出三类沉积物质量综合指数(F)的量化区间值,并在九龙江及毗邻海域进行了示范应用。模型结果显示九龙江口沉积物质量以二类为主,具有面源和点源的复合污染特征,关键区域为漳州近岸海域;单因子评价结果表明主要污染指标为Zn、Cu和Pb。评价结果较好地反应了沉积物环境质量现状,为九龙江口底质保护和治理提供了技术支撑。

In view of the existing problems in sediment quality evaluation in China,based on the conventional monitoring indicators of coastal sediments in China and the standard of Marine Sediment Quality,the PCA was used to construct the evaluation index system and mathematical model of sediment quality. And the quantitative interval values of the three types of sediment quality comprehensive index F were divided. Then,the model was used in Jiulong Estuary and adjacent waters. The results showed that the sediment quality of Jiulong Estuary was mainly of class Ⅱ assessed by the Marine Sediment Quality and characteristied by the pollution of both non point source and point source and its key area was in the coastal waters of Zhangzhou. The results of single factor evaluation indicated that the main pollution indexes were Zn,Cu and Pb. The evaluation results reflect well the current situation of sediment quality and provide technical support for protection and management in Jiulong Estuary.