应用GIS技术对无锡市建成区黑臭河道的研究

Research on Black-odorous Rivers in Wuxi Built-up Area Based on GIS Technology

应用GIS技术研究黑臭河道水质分布与变化情况。结果表明:2021年无锡市建成区46条黑臭河道中,非黑臭水体占比95.7%;黑臭河道2条,主要为NH_(3)-N和DO较差。从上、下半年监测数据对比来看,建成区黑臭河道总体水质有所下降。其中,DO下降27.0%;ORP下降46.0%;NH_(3)-N上升12.6%;TP上升30.6%。说明无锡市建成区虽已基本消除黑臭水体,但是河道中氮、磷等指标仍超过Ⅲ类水平,水质尚未稳定。无锡市建成区黑臭河道总体呈现“固化”趋势,建议采取控源截污、内源治理、生态修复等措施,为无锡市建成区水环境进一步改善打好基础。

On the basis of GIS technologies,the distribution and variation of water quality of black-odorous rivers in Wuxi built-up area were researched.The results showed that among the 46 black-odorous rivers,the non-black-odorous water bodies accounted for 95.7%in 2021.There were two black-odorous rivers,because its NH_(3)-N and DO were poor.From the comparison of the monitoring data in the first and second half of the year,the overall water quality of the black-odorous rivers in the built-up area has declined.DO decreased by 27.0%,ORP decreased by 46.0%,NH_(3)-N increased by 12.6%and TP increased by 30.6%.This showed that although the black-odorous water body has been basically eliminated in the built-up area of Wuxi,the indexes of nitrogen and phosphorus in the river still exceed the level of class Ⅲ,and the water quality is not yet stable.The black-odorous rivers in the built-up area of Wuxi showed a tendency of unchanged.It is suggested that measures such as source pollution control,internal source treatment and ecological restoration should be taken,that give a good foundation for the future.