THE CASE OF SEDIMENT OUTFLOW FROM MOUNTAIN TO THE COAST DUE TO SMALL AND MEDIUM-SIZE FLOODS

Ryuhei Miyata; Reiko Akiyama; Takehito Horie; Yasuhito Noshi; Kei Iguchi

doi:10.9753/icce.v37.sediment.64

No. 37 (2022), Sediment Transport and Morphology

No. 37 (2022)

THE CASE OF SEDIMENT OUTFLOW FROM MOUNTAIN TO THE COAST DUE TO SMALL AND MEDIUM-SIZE FLOODS

Sediment Transport and Morphology

Published 2023-09-01

Ryuhei Miyata
Reiko Akiyama
Takehito Horie
Yasuhito Noshi
Kei Iguchi

Ryuhei Miyata

Reiko Akiyama

Takehito Horie

Yasuhito Noshi

Kei Iguchi

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How to Cite

THE CASE OF SEDIMENT OUTFLOW FROM MOUNTAIN TO THE COAST DUE TO SMALL AND MEDIUM-SIZE FLOODS. (2023). Coastal Engineering Proceedings, 37, sediment.64. https://doi.org/10.9753/icce.v37.sediment.64

Abstract

Smaller rivers in Japan can be characterized as having short distances from the mountainous areas of the source of sediment production to the estuary and steep slopes. Therefore, sediment produced from the mountains and river channels at the time of flooding immediately contributes significantly to the sediment dynamics at the estuary and coast in a short period of time. On the other hand, there have been few observations or studies that have measured the volume of landslides and riverbed fluctuations in the mountains in the entire basin before and after the occurrence of flooding, and quantitatively linked them to the amount of landslide movement and shoreline changes in the entire basin. This paper discusses the Chitose River basin (basin area A: 30km2, river channel distance L: 0.179km, stream gradient I: 1/14) and the Niizaki River basin (A: 16km2, L: 0.213km, I:1/17), which have an estuary on the Yugawara coast in Kanagawa Prefecture. The effect of sediment production from mountains and riverbeds at the time of flooding on coastal sediment dynamics on July 3rd, 2021.

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References

Takaaki UDA (2017): Japan's Beach Erosion - Reality and Future Measures, 2nd ed., World Scientific, Singapore, p. 530.

Takaaki UDA, Masumi SERIZAWA, and Shiho MIYAHARA (2018): Morphodynamic model for predicting beach changes based on Bagnold’s concept and its applications, INTEC, London, UK.

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THE CASE OF SEDIMENT OUTFLOW FROM MOUNTAIN TO THE COAST DUE TO SMALL AND MEDIUM-SIZE FLOODS

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