基于3S技术对太湖底质及水质总磷的研究

应用3S技术研究了太湖底质与水质总磷(TP)的分布情况,并结合水华频次分析了其相关性。结果表明:2016—2018年,太湖底质TP年均值在433~537 mg/kg波动,水质TP年均值从0.064 mg/L上升至0.087 mg/L。从空间分布来看,底质TP、水质TP和水华频次均呈现“西高东低”的规律,太湖西部区尤其是竺山湖区是需要开展治理的重点区域。3年间,太湖西部区水质TP上升,而底质TP与入湖河流TP下降,说明内源磷污染是太湖西部区水质TP升高的主要原因,须加强科学清淤。

Research on Total Phosphorus of Sediment and Water Quality in Taihu Lake Based on 3S Technology

On the basis of 3S technologies (GPS,GIS,RS) integration,the total phosphorus (TP) distributions of sediment and water quality in Taihu Lake were researched.The correlations between TP distributions and cyanobacteria bloom aggregation frequency were also studied.The results showed that from 2016 to 2018,the annual average TP concentrations of Taihu Lake sediment fluctuated between 433 mg/kg and 537 mg/kg,and the annual average TP concentrations of Taihu Lake water quality increased from 0.064 mg/L to 0.087 mg/L.The sediment,water quality and cyanobacteria bloom all showed a spatial distribution law that higher in the west and lower in the east.The western district of Taihu Lake,especially the Zhushan Lake was key area of pollution treatment.The TP concentrations of water quality in western Taihu Lake increased in three years.On the other side,the sediment TP concentrations of western Taihu Lake and water quality TP concentrations of inflow rivers decreased.It was pointed out that internal phosphorus pollution was the main reason for the increase of water quality TP in the western Taihu Lake.Scientific dredging should be strengthened in this area.