Abstract
This research focuses on river bed longitudinal evolution considering grain size distribution. To address this challenge, 1-D theoretical analysis was adopt. Firstly, we succeeded to formulate the temporally longitudinal profile of grain size distribution and river bed evolution from 2-D continuity equation of sediment. And then, removable bed experiment was carried out to enable us to discover what happen in the channel, and to compare with 1-D analysis. According to the result, the phenomena of experiment could be expressed well by using 1-D analysis although there were some problems about longitudinal profile of grain size distribution. Furthermore, it was revealed that the propagation of grain size distribution triggers river-bed degradation.
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