入湖河流对南四湖水质的影响

采用主成分分析法研究了泗河、城郭河等15条主要入湖河流对南四湖水质造成的影响。以DO、COD、CODMn、BOD5等作为评价指标,分别将湖区、河流作为研究对象,分析评价两者之间的关系。评价结果表明,南阳湖、独山湖污染较严重,昭阳湖、微山湖水质状况略优于其他湖区。南阳湖、独山湖入湖河流的COD、CODMn、BOD5浓度较高,造成接纳这些河流的湖区有机物污染比较严重。由于昭阳湖、微山湖入湖河流较少,且河流污染相对较轻,入湖河流对该两湖的水质影响程度小于南阳湖、独山湖的入湖河流。入湖河流的水质状况是南四湖水质状况优劣的决定性因素,整治湖区污染的首要工作是治理周边的入湖河流。

Impact of inflowing rivers on water quality of Nansi Lake

Principal component analysis was carried out to study the impact of 15 main inflowing rivers,including the Sihe River and the Chengguohe River,on the water quality of Nansi Lake.DO,COD,CODMn,BOD5 were selected as the evaluation indices in this study.The relationship between lakes and rivers,which were considered the subjects of the study,was analyzed.The evaluation results show that the water was seriously polluted in Nanyang and Dushan lakes,and the water quality of Zhaoyang and Weishan lakes was better than that of the other lakes.The concentrations of COD,CODMn,and BOD5 were high in the rivers flowing into Nanyang and Dushan lakes,causing serious organic pollution in these lakes.The rivers flowing into Zhaoyang and Weishan lakes,with a smaller amount of water and a slight amount of pollution,had less influence on these two lakes compared with those flowing into Nanyang and Dushan lakes.The results show that the water quality of the inflowing rivers is the key factor influencing the water quality of Nansi Lake,and,thus,priority should be given to remediation of the rivers flowing into Nansi Lake.