巢湖沉积物粒度特征与沉积环境

GRAIN SIZE CHARACTERISTICS AND SEDIMENTARY ENVIRONMENT OF THE CHAOHU LAKE SEDIMENTS

利用巢湖湖底柱样沉积物的粒度资料分析了巢湖湖底沉积物粒径的组成、大小等粒度特征;初步探讨了柱样采样点位置的沉积环境及其沉积过程,以期能为巢湖流域恢复过去环境变化提供参考。通过对沉积物粒度实验分析发现,巢湖靠近河口地区的沉积物粒度在深度上变化幅度大,颗粒物相对较粗,而在湖心位置,沉积物随深度变幅小、连续性好,沉积物的颗粒细。两者的差别分别反映了它们之间不同的沉积环境。

Using grain size data of the sediment column core from the Chaohu Lake,the authors analyzed the granular characteristics such as composition and size of particles of the Chaohu bottom sediments and discussed the sedimentary environment and processes of the sampling area in order to give some assistance to the reconstruction of the ancient Chaohu environment.It is found from the experiment analysis of the grain sizes that particles of sediments close to the river mouth area show relatively large amplitude of changes in depth range and are coarser compared to the sediments at the center position of the lake.Grain sizes of the central sediments change little with depth and have good continuity.The difference between sediments from these two positions has suggested different sedimentary environments.