Abstract
In the last twenty years, gravel bars in the Asahi River have continuously decreased, whereas stable vegetation areas have rapidly expanded on sand bars. As a basic study for establishing a technique to restore a gravel bar, an artificial gravel bar was experimentally created in the field, and the effect of the flood flow on the field was examined. The prior numerical simulation for an annual scale flood predicted that the flood enough to move stones would uniformly flow over the restored gravel bar and the gravel bed would be maintained due to the increase of shear stress of the bed. However, the observed results showed that branches of Salicaceous species and seeds of Eragrostis curvula were driven ashore and the vegetation recovered quickly in the downstream part of the tested area. Additional numerical simulation using the observed hydrograph suggested that branches and seeds would be washed ashore during the flood recession period.
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