“引江济太”对太湖北部底质及水质总磷的影响  

Influence of“Water Diversion Project from Yangtze River to Taihu Lake”on Total Phosphorus of Sediment and Water Quality in Northern Taihu Lake

作　　者：庄严 顾蓓瑜 张虎军 石浚哲 纪侃 叶凉 李洁 ZHUANG Yan;GU Beiyu;ZHANG Hujun;SHI Junzhe;JI Kan;YE Liang;LI Jie(Wuxi Environmental Monitoring Center of Jiangsu Province,Wuxi 214121,China;Wuxi Vocational and Technical Hight School of Automobile and Engineering,Wuxi 214000,China)

机构地区：[1]江苏省无锡环境监测中心,江苏无锡214121 [2]无锡市汽车工程学校,江苏无锡214000

出　　处：《中国环境监测》2021年第4期111-117,共7页Environmental Monitoring in China

基　　金：国家科技重大专项(2017ZX07204004)。

摘　　要：应用GIS技术研究了"引江济太"对太湖北部底质与水质总磷(TP)浓度的影响。研究结果表明,2014—2019年,调水北部沿线4个点位底质TP浓度降幅为59.8%~80.5%;不同点位的水质TP浓度变化存在差异,入湖口点位下降14.1%,沿线其他点位分别上升37.4%、38.6%和45.0%。从空间分布来看,太湖水质TP始终呈明显的"西高东低"分布特点,但底质TP的分布未显示出该类规律。望亭水利枢纽调水情况与入湖口5#点位底质TP浓度呈一定程度的正相关,在调水入湖水量大于出湖水量的年份,5#点位底质TP浓度会偏高。"引江济太"会对太湖北部调水沿线,特别是入湖口附近水域的TP含量产生较大影响,并通过水流迁移与底质再悬浮释放影响下游水域。如何降低望虞河及周边支流的入湖泥沙量将是今后开展科学调水、保障贡湖水源地水质安全的重点研究方向之一。In this study,based on Geographic Information Systems(GIS)technologies,the influences of“Water Diversion Project from Yangtze River to Taihu Lake”on total phosphorus(TP)concentrations of sediment and water quality in northern Taihu Lake were evaluated.The results showed that the TP concentrations decreased by 59.8%-80.5%at four sites along the northern route of water diversion from 2014 to 2019.In addition,there were differences in TP concentration changes in water quality at different points:TP at the entrance of lake decreased by 14.1%,and the other sites along the diversion route increased by 37.4%,38.6%and 45.0%.From the spatial distribution,water quality TP concentrations presented the obvious distribution characteristics of“high in the west and low in the east”,but the sediment did not show a similar trend.Meanwhile,the water transfer situation of Wangting diversion project showed positively related to the sediment TP concentrations of 5#site in lake inlet.The TP concentrations in sediment of 5#site were higher in previous years when the volumes of water transferred into the lake were greater than out of the lake.This indicated that the“Water Diversion Project from Yangtze River to Taihu Lake”would have a big effect on the TP pollutants along the the diversion route of northern Taihu Lake,especially in the water areas of lake inlet.It would affect the downstream waters by water flow migration and sediment resuspension or release.Reducing the amount of sediment from Wangyu River and its tributaries would be very important for transfering water scientifically and guaranteeing the water quality in drinking water sources of Gonghu Lake.

关 键 词：“引江济太” 底质 总磷 

分 类 号：X825[环境科学与工程—环境工程]