近十年广西主要入海河流污染物通量变化研究

A Study of Pollutant Fluxes Variations in Main Sea-going Rivers of Guangxi in Recent Ten Years

河流入海污染物通量变化是流域—河口陆海相互作用研究的重要内容。以广西南流江、大风江、钦江、茅岭江、防城江等5条主要入海河流为例,分析了近十年来入海河流污染物通量的变化特征及其影响因素。结果表明:广西主要河流入海污染物总量呈波动上升趋势;化学需氧量占入海污染物总量的96%以上;相对其他河流,南流江的入海污染物排放量最多;入海污染物是影响河流和河口湾水质变化的重要因素;入海污染物通量变化与河流输沙量变化和流域人均GDP有较好的相关性。对主要入海河流污染物通量的变化研究将有助于提高对广西流域—河口陆海相互作用的认识,为海岸带防灾减灾及综合管理提供科学依据。

The variation of pollutant fluxes into rivers is an important pail of the study of river basin-estuarine land-sea interaction. In this paper,the variation characteristics and influencing factors of pollutant fluxes in five main sea-going rivers, such as Nanliu River, Dafeng River, Qinjiang River, Maoling River and Fangeheng River, are analyzed. The results show that：the total amount of pollutants into the sea of the main rivers in Guangxi shows an upward trend of fluctuation ; COD accounts for more than 96% of the total amount of pollutants into the sea;Compared with other rivers,the discharge of pollutants into the sea of Nanliu- jiang River is the largest;pollutants into the sea are important taetors affecting the water quality of rivers and estuaries;there is a good correlation between the flux of pollutants entering the sea and the change of fiver sediment discharge and the per capita GDP of the river basin. This study will help to improve the understanding of the interaction among the river basin, the land and the sea in Guangxi, and provide a scientific basis for the coastal zone disaster prevention and mitigation and comprehensive management.