Abstract:According to the monitoring data of water quality and runoff volume of the Guan River and Sheyang River from 2004 to 2008,water quality assessment was done using Nemerow pollution index method and the volume of major pollutants entered the sea was assessed. Based on the research results, the influence of the pollutants on the coastal marine environment was studied, and the relationship between the change of pollutant volume and the outbreak Enteromorpha prolifera in the central and southern Yellow Sea was also analyzed. The results showed that the water quality of Guan River was good from 2004 to 2008, but the pollution index showed an upgrade tendency. The water in Sheyang River was slightly polluted in 2005 and 2007, while the water quality was good in 2004, 2006 and 2008. The runoff volume of the Guan River and Sheyang River varied obviously from 2004 to 2008, which were 15.72×108 m3 to 41.93×108 m3 and 28.74×108 m3 to 59.96×108 m3, respectively. The mean annual total volume of main pollutants(CODMn, BOD5, NH4-N and phenol) entered the sea from the Guan River and Sheyang River were 18,794.87 t and 43919.24 t, respectively. The volume of CODMn and BOD5 accounted for over 89% from 2004 to 2008 and both were the leading factors. The pollutants entered the sea from the Guan River and the Sheyang River had effected the coastal marine environment obviously, and had been related to the breaking out of Enteromorpha prolifera in the central and southern Yellow Sea in recent years.
