Trend analysis and assessment of surface water quality in the Yangzhou reach of JingHang Canal
Eight organic and chemical variables were analyzed in surface water samples collected every season over a period of twenty two years. They were determined from seven sampling stations located along the Yangzhou reach of JingHang Canal. The assessment was performed using membership function of twice-slope classification. The results illustrated that: in the past twenty-two years, the water quality of Yangzhou reach of JiangHang Canal stayed mainly between Class Ⅲ and Class Ⅳ. Among the main pollutants, the concentrations of both CODMn and BOD5 were decreasing. They were below Class Ⅲ after 2000.The concentrations of volatile hydroxybenzene and petroleum were remarkably high during 1998 to 2000.In the whole period, they fluctuated in a large degree; the trend of ammonia nitrogen(NH3-N) was relatively smooth, oscillating between Class Ⅲ and Class Ⅳ; other variables were in low concentration and did not fluctuate significantly.
Yangzhou reach of JingHang Canal 、water quality trend 、twice-slope classification
Gao Guizhi Tang Xinxiang
Dept.of Environmental Science and Engineering Nanjing University of Information Science and Technology Nanjing,China
国际会议
北京
英文
1-4
2009-06-11（万方平台首次上网日期，不代表论文的发表时间）