快速城市化背景下的思雅河流域水环境分析

Water Environment Analysis in the Siya River Basin under theBackground of Rapid Urbanization

通过对思雅河流域连续3年的水环境质量监测,结合遥感影像获得其土地利用类型变化,据此研究城市化对水环境的影响。结果表明:2012—2014年间思雅河流域自然、农业景观面积占比减少,而建设用地面积持续增加;研究期间除TDS年均值略微下降外,其余水质指标的年均值几乎均呈递增趋势,尤以TSS和COD增加最显著;TSS、COD、NH 3-N和TP的相对标准偏差均>0.1,显著高于其余参数,说明其波动程度较大。主成分分析表明水环境变化最主要的影响因子为第一主成分(TSS、COD、NH 3-N和TP)。贵安新区大学城建设活动加重了思雅河流域水体污染趋势。

By three consecutive years of water environment quality monitoring and the changes of land use type obtained from remote sensing images in the Siya River basin,the impact of urbanization on the water environment was studied.The results showed that the proportion of natural and agricultural landscape areas in the basin decreased from 2012 to 2014,while the construction land area continued to increase.Except for annual average TDS decreased slightly,the annual average of the remaining water quality indicators almost all increased during the study period,TSS and COD increased most notably.The relative standard deviations of TSS,COD,NH 3-N and TP were all over 0.1,which were significantly higher than that of other parameters,indicating the large fluctuation.Principal component analysis showed that the first principal component(TSS,COD,NH 3-N and TP)was the most important factor affecting the water environment.The construction of the university town in Gui an New District had aggravated the water pollution in the Siya River basin.