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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Sediment management and morphodynamics : Characteristics of meandering streams after construction of the straight low-water channel in the ot...
Characteristics of meandering streams after construction of the straight low-water channel in the otofuke river
Author : SATOMI YAMAGUCHI(1) & JUNGO FUNAKI(2)
ABSTRACT
The Otofuke River is one of the tributaries of the Tokachi River located in the eastern part of Hokkaido, Japan.
Development of meandering streams in bank erodible channels has been observed in the Otofuke River since the
construction of straight low-water-channel in 1975, in contrast to a braided streams which was the typical bed
configuration of the river before. In 2011, extensive bank erosions occurred in various parts of the river channel, and a
part of the dike was washed out during a flood. The amplitude of meandering streams were developed throughout the
river, and chute cut-off were also occurred in a few part of the river at that time. In this study, numerical experiments with
a field-scale channel were performed in order to reproduce the development process of meandering streams observed in
the Otofuke River after the straight low-water-channel was constructed in 1975. It is found that meandering streams
caused by alternate bar formation can be appeared in widening process of low-water-channel with local bank erosion at
scouring points, and the local bank erosion is going rapid extremely in this process. The numerical experiments also
suggest that the meandering streams can be changed to the braided streams after the low-water-channel widened to a
certain extent. The transition process from meandering streams to braiding are appeared after the widening process of
low-water-channel with meandering streams. The chute cut-off are seen to be occurred in the transition process to
braiding. The channel development characteristics simulated in this study can be thought to show the basic process of
the recurrent of braided channel observed in the Otofuke River before.
File Size : 2,200,092 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Sediment management and morphodynamics
Date Published : 28/08/2015
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