钱塘江河口低溶解氧现象及形成机理初探

Preliminary study on low DO phenomenon and formation mechanism in estuary of Qiantang River

通过钱塘江河口沿程实测水质资料分析,发现钱塘江河口富阳-闸口段存在低溶解氧现象。为查明原因并确定污染源和治理方法,在分析河口低氧区形成机理的基础上,对低氧河段水温、DO等进行了垂向监测,并调查分析了沿线污染源分布情况。分析结果表明,富阳境内的污染源及支流浦阳江输入的污染负荷是造成该河段低氧的主要原因;耗氧物质包括有机和无机耗氧污染物,而无机耗氧污染物为造纸废水中的亚硫酸盐。

The analysis on the measured water quality data in estuary of Qiantang River discovered that low DO phenomenon exists in the reach from Fuyang to Zhakou. In order to find out the cause of the low DO and determine the pollution sources and control method, based on formation mechanism analysis of low DO zone in the estuary, the vertical distributions of water tempera- ture, DO etc. of low DO river reach were measured and the pollution sources in the same area were investigated. The analysis re- suits show that the stratification of saline water intrusion is not the cause of low DO in the reach ; the pollution sources in Fuyang County and the pollution load coming from the tributary of Puyang River are the main causes of low DO in the reach; the oxygen consumption substances include organic pollutants and inorganic pollutants, the inorganic pollutant is sulfite in waste water of paper making.