太湖水体中悬浮物研究

为了全面了解太湖水中悬浮物的物质组成、变化规律，选取了太湖站近10年来各测点的连续观测资料及2次定点观测资料，分析了太湖水体中悬浮物的无机和有机颗粒成份、时空分布、垂直变化、与风速、风向的关系以及与重要光 学参数的关系。研究结果表明：太湖悬浮物中有机物大概占30%；浓度大小的湖区分布大致是：湖心区＞河口区、梅梁湖、贡湖、五里湖＞东太湖；悬浮物浓度的季节变化是：湖心区冬季、春季＞秋季＞夏季，东太湖冬季＞春季、夏季、秋季，其他湖区则没有明显季节变化；垂直分布是：深层＞表层并且底泥悬浮的临界风速在5~6.5 m/s之间；悬浮物浓度的增加是引起湖水透明度降低和光学衰减系数增大的主要原因。

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.