| Issue |
E3S Web of Conf.
Volume 415, 2023
8th International Conference on Debris Flow Hazard Mitigation (DFHM8)
|
|
|---|---|---|
| Article Number | 01027 | |
| Number of page(s) | 4 | |
| Section | Processes and Mechanics | |
| DOI | https://doi.org/10.1051/e3sconf/202341501027 | |
| Published online | 18 August 2023 | |
How are fine sediments described in sediment sheet flow?
1 Faculty of Life and Environmental Sciences, University of Tsukuba, Tsukuba, Ibaraki, 3058572, Japan
2 CTI Engineering, Co., Ltd., Tsukuba, Ibaraki, 3002358, Japan
3 Japan Conservation Engineers, Co., Ltd., Urawa, Saitama, 3300074, Japan
4 Kokusai Kogyo, Co., Ltd., Fuchu, Tokyo, 1830057, Japan
5 Faculty of Agriculture, Niigata University, Niigata, 9502181, Japan
6 College of Science and Engineering, Ritsumeikan University, Kusatsu, Shiga, 5258577, Japan
* Corresponding author: uchida.taro.fw@u.tsukuba.ac.jp
Stony debris flow transits to sediment sheet flow when the river bed gradient becomes gentle. The sediment sheet flow consists of a water flow layer and a sediment moving layer. Fine sediments are expected to behave as a part of the fluid rather than a solid phase in the sediment moving layer. Further, it can be thought that a part of fine sediment can be suspended in the water flow layer. However, it was not possible to physically express whether the fine sediment behaves as a solid phase or a fluid phase in the numerical simulation model. Here we physically modeled fine sediment behavior in sediment sheet flow. We confirmed the applicability of the new model to describe the longitudinal deposited sediment gradient in flume experiments.
© The Authors, published by EDP Sciences, 2023
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