关键词: 演变分析, 输沙量, 粒径, 水期, 冲淤平衡

Abstract: There are long-term hydrographic data collected in Zhutuo, Beibei and Cuntan, three hydrographic controlling station at Chongqing reach.in Yangtze River.According to data including suspended load and sizes at entrance of reach and exit and bed deposition, channel pattern varying with water period, detailed synthetic analysis about reach evolution has been made in this paper. Total feature of this reach evolution is that bed is deposited in period of floodw ater and eroded in dry season and kept balance of erosion and deposition in a year or many years.It is the same with the results of actual measuring channel cross section.

Key words: evolution analysis, suspended load, sandy-size, period of water, balance of erosion and deposition