International Journal of Erosion Control Engineering
Online ISSN : 1882-6547
ISSN-L : 1882-6547
Original Article
Gravel-Silt-Packed Bed Model and Its Application to the River Channel Deformation with Vegetation
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2010 Volume 3 Issue 2 Pages 117-125


Channel deformation process of a gravel-bed river with vegetation zone was investigated in the present study. The channel is assumed to be constituted by gravel-silt mixture. When we simulate this deformation process, the evaluation of erosion rate of silt from gravel-bed is important. The formula by Ashida and Fujita [1986] is only the applicable one. In this study, a “gravel-silt-packed bed model” was newly invented and introduced in order to make the computation effectively with the above mentioned formula. The model enables us to predict a temporal variation of sediment composition in bed as well as the bed elevation reasonably. In this paper, the model was applied to investigate the effect of both a zone of vegetation and a silt erosion and deposition on the channel deformation. As a result, it was confirmed that a depositional terrace like landform formed just inside the vegetation zone around a water margin, which was observed and reported by Fujita et al. [1996].

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© 2010 Japan Society of Erosion Control Engineering
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