Examination of sediment dynamics based on the distribution of silica fluxes and flood sediments in the otoishi river related to the northern kyushu heavy rain disaster, july 2017

Ryunosuke Nakanishi, Akira Baba, Takahiro Tsuyama, Hiro Ikemi, Yasuhiro Mitani

研究成果: Contribution to journalArticle査読

抄録

The heavy rain disaster occurred in July 2017, in northern Kyushu, Japan. The river environment greatly changed due to sediment moving accompanied by erosion. It is important regarding disaster prevention to localize watersheds where sediment transportation is active. In this study, the sediment dynamics were discussed on the basis of our investigation about the stored sediment, water-flow, and silica fluxes from sub-basins. As a result, the sediment survey revealed that many sediments consist of sand or gravel and were moved secondarily by water-flow. By the hydrological survey, it was confirmed that the trend of the dissolved silica concentrations varied between the right and the left bank tributaries. It was suggested that the left bank tributaries have a various process of water-flow. Considering the distribution of collapsed slopes, the right bank tributaries have more collapsed slopes than the left bank tributaries. As suggested by the results, the range of the silica flux is wider at the left bank tributaries because the sedimentation shows various distributions. On the other hand, the right bank tributaries were estimated topographically stable since the value of the silica flux is about the same.

本文言語英語
論文番号75
ジャーナルGeosciences (Switzerland)
9
2
DOI
出版ステータス出版済み - 2 2019

All Science Journal Classification (ASJC) codes

  • 地球惑星科学(全般)

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