STUDY ON THE SEDIMENTARY CHARACTERISTICS OF THE YONGDING RIVER

There are obvious differences of deposition between the upstream and downstream of the Yongding River, which is the largest tributary of the Haihe River system in North China. With analysis of sediment samples from the upstream and downstream, this paper discusses the sedimentary structure types at different sections of the river. Based on the analysis of particle size, bedding and vertical sequence, the difference in sedimentary characteristics from the upstream to the downstream are studied. According to the formation mechanism of braided river and channel distribution pattern of the Yongding River in the same historical period, the formation and evolution of different river sections is discussed.