2005 Volume 49 Pages 1021-1026
The recent change of river landscape has been brought by expansion of vegetated areas and transformation of bars because of human impacts such as dam construction. Therefore, in order to manage river landscape properly, it is important to estimate morphological change quantitatively. We have continued to study the downstream segment of the Kizu river (0-20km) to identify the extent of morphological change and have found special patterns in the changes of vegetated areas and the change of bar morphology. In this paper, we postulate a fundamental pattern of transformation of bars with growth of vegetated areas in the Kizu river. Then, numerical simulation is conducted to clarify the influence of vegetated areas on the migration and transformation of bars. The result suggests that the relationship between local speed of bar migration and expansion rate of vegetated areas is a key to bring the typical pattern of morphological change in the Kizu river.
