河床的变形現象,不僅發生在水位升降沙洲出没的过程当中(H.A.索洛明切夫),但就長时間的观察,每隔数十年或数百年,也会因流綫的变迁、河床的增寬、曲流的發育,而逐渐形成新的河床(K.N.罗新斯基等)。由于这种类型的河床变形现象經歷时間較長,可能在該区已進行过多次的实地測量,如果將各时期实測的河道地形圆作綜合的比較分析,河床变形的痕跡及其基本特点也是可以發現出來的。我們 River bed deformation, not only occurred in the process of water level rise and sand bank haze (HA Solu Mingchev), but for a long time observation, every few decades or hundreds of years, will also be due to changes in streamlines, Riverbed broadening, meandering development, and gradually formed a new river bed (KN Luo Xinsiji, etc.). Due to the long history of this type of river bed deformation, many field measurements may have been made in this area. If the river topographic circles measured in each period are comprehensively compared and analyzed, the traces of river bed deformation and their basic Features can be found out. we