2019年秋季长江口及邻近海域水质环境现状及综合评价

The Current Status and Comprehensive Evaluation of the Water Quality Environment in the Yangtze River Estuary and Its Adjacent Area in Autumn 2019

基于2019年秋季长江口及临近海域水质和沉积物要素调查数据,从水质和沉积物两个角度出发建立水质评价综合模型,以了解长江口及邻近海域水质环境现状。结果表明:(1)水质方面,活性磷酸盐为主要污染指标,且劣四类水质样点主要分布在口内及口门区域。(2)沉积物方面,调查区域重金属潜在生态风险程度整体上表现为轻微,7种重金属元素污染程度排序为Cd>As>Hg>Pb>Cu>Cr>Zn。(3)综合评价模型结果表明,口外区水质综合环境较好,杭州湾北部次之,口内和口门区较差。

Based on the survey data of water quality and sediment elements in the Yangtze River Estuary and its adjacent area in the autumn of 2019,a comprehensive water quality evaluation model was established from the perspectives of water quality and sediments to understand the current status of the water quality of the Yangtze River estuary and adjacent seas.The results show that:(1)In terms of water quality,active phosphate is the main pollution indicator,and the samples of the worse four types of water quality are mainly distributed in the mouth and the mouth area.(2)In terms of sediments,the potential ecological risks of heavy metals in this survey area are all slight,and the pollution levels of the seven heavy metal elements are ranked as Cd>As>Hg>Pb>Cu>Cr>Zn.(3)The results of the comprehensive evaluation model show that the comprehensive environment of water quality in the out-mouth area is better,followed by Hangzhou Bay,and the in-mouth and mouth-gate areas are worse.