尼洋河水质沿程变化特征多元统计分析

【目的】了解尼洋河沿程水质状况,分析丰水期干流水体的主要污染指标,科学合理的说明尼洋河流域饮用水源地的水质对人体健康危害程度。【方法】基于2018年丰水期水质监测数据,运用多元统计方法分析了尼洋河干流上10个断面的水质监测指标,同时依据干流各个监测断面的水体指标检测结果,利用系统聚类分析方法将断面所在河流分为3组,监测断面分组结果与尼洋河流域上、中、下游分布基本一致。【结果】第1组水体以有机污染为主,TP与TN的质量浓度较高,水体污染程度较轻,污染源单一;第2组水体受有机污染与重金属多个指标的污染,水体水质较第1组差,污染来源相对复杂;第3组水体水质污染最为严重且污染指标最多。【结论】分析结果与单因子水质评价结果基本一致,尼洋河干流水质随河流方向有改善的趋势。

Changing Characteristics of the Water Quality along the Niyang River Based on Multivariate Analysis Method

【Objective】The purpose of this paper is to analyze the water quality status and find the main pollution indicators of the water body during the wet season along the Niyang River. The characteristics of water pollution in drinking water in the Niyang river basin and its potential hazards on human health were investigated.【Method】Based on the water quality monitoring data during the 2018 flood season,multiple statistical methods were used to analyze water quality from 10 sampling sites in main stream of Niyang river, and Hierachical cluster analysis indicated that the monitoring sections can be classified into three groups according to their water quality.【Result】In the first group,the water were mainly polluted by organic pollutants,the nitrogen and phosphorus nutrient concentrations were relatively high in these rivers,but the degree of water pollution was light, and the pollution sources were also relatively simple; In the second group,the water were mainly polluted by organic and mental pollutants,the water quality were worse than the first group and the pollution sources were relatively complex;In the third group,The water body with the most serious pollution and the most pollution index in three groups.【Conclusion】The results of principle component analysis are basically consistent with the single factor water quality evaluation results, the water quality of Niyang river has improved with the river direction.