Author(s): Koichiro Ohgushi, Wataru Kawahara, Toshihiro MORITA, Maya Amalia Achyadi

Linked Author(s): Koichiro Ohgushi, Toshihiro MORITA, Maya Amalia

Keywords: Meandering; Cut-off channel; Tributaries; Ship transportation; Inundation analysis;

Abstract: Chikugo river has many cut-off channels nowadays but there are many old meandering waterway still existing. All inflowing tributaries into Chikugo River do not connect directly to main stream of present Chikugo River but flow into the old meandering waterway of this river. A cut-off channel and old meandering waterway with inflowing tributaries are analyzed in the both cases where a tide is effective or not effective. In this study, the role of old meandering waterway and tributaries with cut-off channels is considered hydraulically. As a results, the old large meanderings are considered to be used for the traditional irrigation system of this area, ship transportation and flood control. Moreover, from 2-D inundation analysis, during flood period, the connecting system between inflow tributaries and the old meandering waterway can decrease the overflowing velocity in the case of excessing the designed flood discharge of each tributary

DOI: https://doi.org/10.3850/38WC092019-1289

Year: 2019