入湖污染河流对受纳湖湾水质的影响

Effect of Polluted Inflow River on Water Quality of Lake Bay

为研究滇池重污染湖湾——福保湾的污染现状及入湖污染河流对湖湾水质的影响,并为福保湾污染底泥固化技术示范工程提供基础数据,在福保湾布设15个采样点,采集并分析表层水中营养元素氮、磷的含量.结果表明,福保湾氮、磷等营养元素含量的空间分布规律明显,入湖河流污染负荷对湖湾水质有较大影响.河口附近水域水质较差,ρ(TP)高达0.7 mg/L,以不溶的颗粒态磷为主;ρ(TN)为7 mg/L左右,其中的50%以上以NH3-N的形态存在.随与河口间距离的增加,上覆水中ρ(TN)和ρ(TP)逐渐降低.在距河口300 m的水域范围内,ρ(TN)和ρ(TP)的空间分布规律与A.B.卡拉乌舍夫扩散模型计算结果相符.

In order to investigate the pollution situation about Fubaowan, a lake bay of Dianchi Lake, and offer the basic data for the demonstration project of Solidification of Polluted Sediments in the Fubaowan, fifteen sampling locations were set and the concentrations of nitrogen and phosphorus in the water were analyzed. The results showed that the pollutants in the river which flowed into the lake greatly influenced the water quality in the lake bay. The total phosphorus in the surface water of the region near the estuary was about 0.7 mg/L which consisted mainly of the insoluble phosphorus and the total nitrogen was about 7 mg/L which consisted mainly of the ammonia nitrogen. With the increase of the distances between the sampling sites and the estuary, the total nitrogen and total phosphorus in the surface water decrease gradually. Variation of the total nitrogen and total phosphorus in the surface water in the region 300 m of the estuary within accord with the A.B. KapayШeb diffusion model.