Abstract
The erosion process of the river bed are classified into two categories. One is the erosion by the meandering stream at low discharges and another is the erosion by the bank-full flow at high discharges. In this paper, the former process is discussed experimentally and theoretically in both cases of the bed degradation and the dynamic equilibrium channel bed state. The lateral erosion as well as the vertical erosion is essential to the development of the meandering stream. Such a process was simulated by the numerical method based on the 2-dimensional model of the bed variation.
