大连市近岸海域水质时空特征及原因分析

“十三五”期间大连市近岸海域水质状况良好,主要污染指标无机氮浓度总体呈下降趋势,但个别海湾仍存在无机氮污染问题。在全面分析近岸海域水质及无机氮时空分布特征的基础上,从海域综合治理措施、入海河流水质及污染物入海通量、海湾地理特征等方面深入分析原因,并对持续改善海域环境质量提出了切实可行的防治措施。

During the"13^(th) Five-Year Plan"period,the water quality of the coastal waters of Dalian City was good,and the concentration of inorganic nitrogen in the main pollution indicators showed an overall downward trend.But there was still an inorganic nitrogen pollution problem in some bays.On the basis of a comprehensive analysis of the spatial-temporal characteristics of water quality and inorganic nitrogen in coastal waters,the causes are analyzed in depth from the aspects of comprehensive management measures of sea areas,water quality of rivers entering the sea and the flux of pollutants into the sea,and geographical characteristics of bays.Practical prevention and control measures are proposed for continuous improvement of the environmental quality of sea areas.