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基于主成分分析法的闽江口及其近岸水域水质评价
林秀珠1, 饶清华1, 陈 琪2, 林茂兹1, 林云杉3
1.近海流域环境测控治理福建省高校重点实验室福建师范大学福清分校;2.福建省水利水电勘测设计研究院;3.福建省环境监测中心站
摘要:
选取2016年4月、7月和10月闽江口及其近岸水域7个调查点位的盐度、悬浮物、pH、溶解氧、化学需氧量、氮营养盐和重金属等15项监测指标数据,采取主成分分析法分析了该水域的水质,明确影响该水域水质的主要污染因子。结果表明:15项监测指标转换提取为4个主成分,解释82.153%的方差。从时间分布来看,闽江口及其近岸水域在4月份水质较差,10月份次之,7月份较好。从空间分布来看,近河口水质较差而远离河口水质较好。影响该水域污染水质的主要驱动因子是pH、COD、氮营养盐和Cd。研究结果对于进一步了解闽江口及其近岸水域水质情况具有重要意义,同时也为福建省海洋管理的科学决策提供支持。
关键词:  闽江口  近岸水域  水质评价  主成分分析
DOI:
分类号:
基金项目:福建省高等学校新世纪优秀人才支持计划项目(闽教科[2018]47号); 中央引导地方科技发展专项(2019L3013)
Water Quality Assessment of the Minjiang River Estuary and Its Coastal Waters Based on Principal Component Analysis
Lin Xiuzhu1, Rao Qinghua1, Chen Qi2, Lin Maozi1, Lin Yunshan3
1.Key Laboratory of Measurement and Control System for Coastal Environment,Fuqing Branch of Fujian Normal University;2.Fujian Provincial Investigation Design Research Institute of Water Conservancy Hydropower;3.Fujian Environmental Monitoring Center
Abstract:
Three surveys were conducted in the Minjiang River estuary and its coastal waters in April, July and October 2016 for collecting the water environmental quality information on the 15 environmental indicators including salinity (S), suspended solids (SS), pH, dissolved oxygen (DO), chemical oxygen demand (COD), nitrogen nutrient, and heavy metals. The water environmental quality of Minjiang River estuary and its coastal waters were analyzed using by the principal component analysis (PCA) in order to identify the potential driving factors influencing the water environmental quality. Four principal components were extracted from the 15 environmental indicators, which explained 82.153% of the total variance in the original data set. Temporal variations indicated that the water environmental quality in Minjiang River estuary and its coastal waters generally followed the sequence of July > October > April. Spatial variations suggested that pollution was more serious in the Minjiang River estuary than its coastal waters. pH, COD, nitrogen nutrient and cadmium played a key role in the water environmental quality. The research results are of great significance for further understanding of the discharge of the water environmental quality of Minjiang River estuary and its coastal waters, and will be a strong support for the scientific decision-making of marine management in Fujian Province.
Key words:  Minjiang River estuary  coastal waters  water quality assessment  principle component analysis
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