滇池北岸入湖河流水质变化趋势分析

文章采用WPI水污染指数法评价滇池北岸各片区河道的水质,并分析其变化趋势,同时采用pearson相关分析方法研究旱季和雨季各片区河道WPI指数变化趋势的相关度。结果表明:1988-2001年滇池北岸河道水质污染主要为减轻的趋势;2001-2007年随着昆明市的大规模扩张,其加重趋势非常明显;2007-2009年,随着河道水环境综合整治工程的大规模开展,又主要表现为减轻趋势,且旱季水质污染减轻的趋势比雨季明显,在纳入统计的5个片区河道中,旱季有4个片区河道水质好转,雨季有3个片区河道水质好转。这是由于2007-2009年间开展的河道水环境综合整治工程主要针对点源污染控制。此外,由于面源污染特征在5个片区中的4个片区都非常相似,雨季各片区河道WPI指数变化趋势的相关度比旱季高。

Analysis of Water Quality Variation Trend in Lake Inlet River on North of Lake Dianchi

Water pollution index method was used to assess water quality of north of Lake Dianchi,variation trend as well as correlation between dry and rainy season were analyzed.Results showed that degrees of river contamination in north of Lake Dianchi mainly relieve from 1988 to 2001 and is becoming serious from 2001 to 2007 with the expanding of Kunming,then relieve between 2007-2009 with the implementing of large scale water pollution control project.Relieve trends in dry season are obvious than that in rainy season,with relieve of water contamination in 4 districts in dry season and 3 in rainy season,since pollutant interceptings mainly focus on point source.Correlation degree of contamination changes in rainy season is higher than that in dry season because of the same characteristics of water pollution in 4 districts.