Impacts of sediment transport due to the kumamoto earthquakes on an intertidal flat at the mouth of the Shirakawa river, Japan

Akira Tai, Keitaro Fattori, Yoshihisa Akamatsu, Koichi Yamamoto, Tomohtro Komorita, Ryutei Inui, Yasuo Nihei

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

Abstract

Landslides frequently occurred in the Shirakawa basin due to the Kumamoto earthquakes occurred in 2016, a large amount of sediment flowed into the river channel of Shirakawa River. They were deposited on an intertidal flat at the mouth of the Shirakawa River. That is concerned about the influence on the water environment and the fishery industry. Therefore, in this study, in order to examine the influence of the sediment on the intertidal flat at the mouth of the Shirakawa River, we conducted a field survey and estimated the state of the river sediment budget. Regarding the field survey, we conducted grain size analysis and bed elevation survey on the intertidal flat at the mouth of the Shirakawa River. As for the estimation of the state of the river sediment budget, we estimated the amount of bedload using turbidity data. The results showed that the sediment deposited was fine. As for the ground height on the intertidal flat at the mouth of the Shirakawa River, the period from May to July was rising, however, the period from July to January was declining. Regarding the estimation of the state of the river sediment budget, the amount of sediment that flowed into the intertidal flat due to the flood of last year contains a large suspended load and it was about 10 times compared with the whole year of it.

Original languageEnglish
Title of host publicationProceedings - International Association for Hydro-Environment Engineering and Research (IAHR)-Asia Pacific Division (APD) Congress
Subtitle of host publicationMulti-Perspective Water for Sustainable Development, IAHR-APD 2018
EditorsJohan Syafri Mahathir Ahmad, Muhammad Ramdhan Olii, Hendy Setiawan, Djoko Legono, Ani Hairani, Roby Hambali, Benazir, Warniyati Warniyati, Karlina
PublisherDepartment of Civil and Environmental Engineering, Faculty of Engineering, Universitas Gadjah Mada
Pages417-424
Number of pages8
ISBN (Electronic)9786027176270
Publication statusPublished - Sep 1 2018
Event21st Congress of International Association for Hydro-Environment Engineering and Research-Asia Pacific Division: Multi-Perspective Water for Sustainable Development, IAHR-APD 2018 - Yogyakarta, Indonesia
Duration: Sep 2 2018Sep 5 2018

Publication series

NameProceedings - International Association for Hydro-Environment Engineering and Research (IAHR)-Asia Pacific Division (APD) Congress: Multi-Perspective Water for Sustainable Development, IAHR-APD 2018
Volume1

Conference

Conference21st Congress of International Association for Hydro-Environment Engineering and Research-Asia Pacific Division: Multi-Perspective Water for Sustainable Development, IAHR-APD 2018
CountryIndonesia
CityYogyakarta
Period9/2/189/5/18

All Science Journal Classification (ASJC) codes

  • Ecology
  • Environmental Engineering

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