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河口的淤积、延伸、改道,都可以理解为变更河流侵蚀基面的高度,从而引起河流纵剖面的调整以及水流挟沙能力与来沙量对比关系的改变,产生自河口向上发展的溯源堆积和溯源冲刷。这种溯源性质的堆积和冲刷与河流在塑造平衡纵剖面的过程中所产生的沿程淤积和沿程冲刷是性质不同的两种河床变形。前者自下而上发展,变化幅度下大上小,受制于流程的增长和缩短;后者自上而下发展,变化幅度一般上大下小,受制于水流挟沙力与来沙状况的对比关系。
The siltation, extension and diversion of estuaries can all be understood as changing the height of river erosion basement, resulting in the adjustment of river longitudinal profile and the change of sediment carrying capacity and sediment carrying capacity, resulting in the traceability and accumulation of upward development from estuaries Trace erosion. The accumulation and scouring of traceable nature and the erosion along the process and the erosion along the river during the process of shaping the balanced longitudinal profile are two kinds of bed deformation with different properties. The former is developed from the bottom up, and its rate of change is large and small, subject to the growth and shortening of the process. The latter develops from top to bottom with a generally small change in magnitude, subject to the contrast of the sediment-carrying capacity with the incoming and outgoing water flow relationship.