Experimental study on the accumulation of cedar at the bridge

Ryo Nishiwaki, Kazuya Watanabe, Noritoshi Saito, Yuriko Matsubayashi, Hitoshi Tanaka

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

This paper presents an experimental approach to investigate the accumulation process of cedar at the bridge. Recently, it was frequently observed the river floods had brought a lot of woody debris such as beech trees along its way and deposited at the bridge locations as for an example during the Typhoon No. 10 in August 2016 in Omoto River, Iwate Prefecture. The rise of the water level due to wood accumulation at the bridge not only destroys the bridge itself but also causes local flooding. It was a possibility of similar disaster in Akita Prefecture which has a lot of cedars. In this study, a series of hydraulic experiment models were carried out using a bridge model with a scale of 1/180 that based on the actual width and the river channel of Omoto River. The cedar rod was used for driftwood model. Three experiment cases were conducted to investigate the effects of driftwood length, driftwood mixing length and flow rate. The number of driftwood was estimated from the volume of measured driftwood during the flood event in Omoto River. As results, this study indicated that the length of driftwood plays an important role to the amount of debris accumulation at the bridge and water level changes in surrounding areas.

Original languageEnglish
Title of host publicationAPAC 2019 - Proceedings of the 10th International Conference on Asian and Pacific Coasts
EditorsNguyen Trung Viet, Tran Thanh Tung, Dou Xiping
PublisherSpringer
Pages953-958
Number of pages6
ISBN (Print)9789811502903
DOIs
Publication statusPublished - 2020
Event10th International Conference on Asian and Pacific Coasts, APAC 2019 - Hanoi, Viet Nam
Duration: 2019 Sep 252019 Sep 28

Publication series

NameAPAC 2019 - Proceedings of the 10th International Conference on Asian and Pacific Coasts

Conference

Conference10th International Conference on Asian and Pacific Coasts, APAC 2019
Country/TerritoryViet Nam
CityHanoi
Period19/9/2519/9/28

Keywords

  • Cedar
  • Length of the driftwood
  • Mixed driftwood
  • Water level

ASJC Scopus subject areas

  • Aquatic Science
  • Ecology, Evolution, Behavior and Systematics
  • Ecology

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