A STUDY ON TOTAL SUSPENDED MATTER IN LAKE TAIHU

Total suspended matter plays an important role in internal loading release and water environment. Total suspended matter determines the transparency of water and the distribution of underwater light, which ultimately determines the lake primary productivity. Based on long-term and two times fixed-point field observations of total suspended matter, wind and wave, the composition, temporal and spatial variations, vertical variation and the relationship between total suspended matter and wind and wave are analyzed. The results show: Organic suspended matter accounts for 30% of total suspended matter; Total suspended matter is characterized by regional variation, with the highest value in Lake Center and the lowest value in East Taihu Lake; Obvious seasonal variations of total suspended matter are characterized in Lake Center and East Taihu Lake; Vertical variations are characterized by the increase of concentration of the total suspended with depth; The critical wind speed of sediment resuspension is between 5 and 6.5 m/s; Increase of total suspended matter results in decrease of transparency and increase of beam attenuation coefficient.