Ｄ

京都大学教育研究振興財団助成事業
成 果 報 告 書
平成2017年 8 月 22 日

公益財団法人京都大学教育研究振興財団会 長 辻井 昭 雄 様
所属部局・研究科

工学研究科

職 名・学 年

博士後期課程2年

氏
助成の種類

名

Shampa平成 29

年度 ・国際研究集会発表助成

37th IAHR WORLD CONGRESS
第37回国際水圏環境工学会世界大会

研究集会名
発表形式

㊞

□ 招 待・□ 口 頭・□ ポスター ・ □ その他（）

発表題目

SWITCHING OF BIFURCATION TO SINGLE CHANNEL: CASE OF A SAND BED BRAIDED
RIVER

開催場所

マレーシア

渡航期間
成果の概要

平成

29 年

8 月 13日～

平成

29 年 8月18 日

タイトルは「成果の概要／報告者名」として、A４版２０００字程度・和文で作成し、添付して下さい。 「成果の概要」以外に添付する資料 □ 無□ 有()
交付を受けた助成金額

150000円

使用した助成金額

150000円

返納すべき助成金額
会計報告
助成金の使途内訳

0円
ビザ申請料 17400 円
往復航空券代 82060 円
関空-京都往復交通費 8200 円
国内交通費 4041 円
宿泊料(5日間) 38299 円（今回の助成に対する感想、今後の助成に望むこと等お書き下さい。助成事業の参考にさせていただきます。）

当財団の助成について
成果報告書および成果の概要は、財団に郵送(あるいは持参)するとともに、Excel・Wordファイルでメール送信して下さい。 メール送信分の印鑑は不要です。

成果の概要/Shampa
Program: 37th IAHR World Congress
Venue: Putra World Trade Centre, Kuala Lumpur, Malaysia
Date: Aug 13 – Aug 18, 2017
Title of Presentation: SWITCHING OF BIFURCATION TO SINGLE CHANNEL:
CASE OF A SAND BED BRAIDED
RIVER
Report: 37th IAHR World Congress Visit
This year, the 37th IAHR World Congress was focus on the management of Water on a
Sustainable way and the water specialists all over the world shared their experiences for abetter future. Nevertheless, focus was also be given on the central roles of river and sedimentmanagement, flood management, environmental hydraulics and industrial flows, coastal,
estuarine and lakes management, urban water management, water resources management,and hydro informatics / computational methods as well as experimental methods. Theorganiser has published the peer-reviewed paper in the proceedings of this congress.
The 37th World Congress of IAHR (International Association for Hydro-Environment
Engineering and Research) was held in Kuala Lumpur, Malaysia, from August 14th to 18th,2017. This congress has received 1300 abstracts and 906 full papers. Upon review process ofthe full papers838 full papers were accepted without corrections and finally 772 papers werepresented in the congress.
My oral presentation included my PhD research topics related to switching of bifurcation in
braided river under the theme river and sediment management. The date of my presentation is
17 August 2017 at 14:30 P.M. I presented about the Bifurcation plays a major role in shaping
the braided river. Previous studies showed the process of bifurcation but most of them arebased on nodal point concept rather than the network formation process of the braided river.
Based of field observation, lab experiment and numerical simulation it was explained thateither the planform of the bifurcation or the hydraulic property of upstream channel plays themajor role in case of closing one channel. Hence, through our study, the switching ofbifurcation phenomena was be investigate using natural river bathymetry in a small branchof Brahmaputra- Jamuna river. From satellite imagery, it is obvious that this 17 km Long
Branch shows such switching process from 2011 to 2013.
The causes of the initiation of bifurcation switch, the effect of the upstream channel hydraulicproperty on bifurcation and influence of angle of the bifurcating channels to the switch wasbasically investigated in this study through 2D morphodynamic numerical approach using
Delft 3D software. As a boundary condition the hypothetical Discharge and Water level has
been used. Several cases were considered. One was the same hydraulic condition of the river
reach as of the year 2011. The others were certain percentage of increasing and decreasing ofriver discharge.
The results from our study indicates that bifurcation switching phenomenon is largely
depends on upstream control e.g. incoming discharge. Nevertheless, this phenomenon ishighly related with the upstream channel geometry and hydraulic condition. The dimensionof downstream mid channel bar, which is the cause of bifurcation, may influence thedischarge asymmetry greatly but may possess an indirect impact over the switching process.

I think, such a vast conference enhanced my capability to think loudly by hearing theresearch experiences from the different parts of the world. In addition I got the opportunity todevelop the networking with the researchers from other institutions and countries.

Figure 1: The snapshot of the inauguration program