JpGU-AGU Joint Meeting 2020

Presentation information

[E] Poster

M (Multidisciplinary and Interdisciplinary) » M-IS Intersection

[M-IS01] Tsunami deposit

convener:Daisuke Ishimura(Department of Geography, Tokyo Metropolitan University), Takashi Chiba(Faculty of Bioresource Sciences, Akita Prefectural University), Masaki Yamada(Department of Geology, Faculty of Science, Shinshu University), Takashi Ishizawa(International Research Institute of Disaster Science, Tohoku University)

[MIS01-P13] Detailed analysis of tsunami deposits made by large-scale laboratory experiments

*Takumi Yoshii1, Shiro Tanaka1, Masafumi Matsuyama1 (1.Central Research Institute of Electric Power Industry)

Keywords:Tsunami deposit, Laboratory experiment, Sedimentary structure

The characteristics of tsunami deposits can reflect the hydraulic parameters of tsunami which made the tsunami deposits. However, considerable variation of tsunami deposits in the field makes it difficult to estimate the scale of tsunami from the resulting deposits. Thus, the authors have conducted the large-scale laboratory experiment on tsunami deposits and succeeded in reproducing the deposits (Yoshii et al., 2017, 2018). In these previous studies, the hydrodynamic conditions and the resulting deposits were investigated by using bulk samples.

In this presentation, we will present detailed analysis of tsunami deposits made by these flume experiments and discuss the reproducibility of the deposits in the flume. Okazaki et al.,(2017a,b) have already indicated that the se flume tsunami deposits has the complex structures and Okazaki el al.,(2018) have discussed the similarity to the tsunami deposits in the field. Based on these results, we analyzed the structure of these flume deposits by using core samples and peer samples. The result will provide useful information for future field investigation and interpretation of tsunami deposits.

Yoshii, T., Tanaka S., Matsuyama M.: Tsunami deposits in a super-large wave flume, Marine Geology 391, 98–107, 2017.

Yoshii, T., Tanaka S., Matsuyama M.: Tsunami inundation, sediment transport, and deposition process of tsunami deposits on coastal lowland inferred from the Tsunami Sand Transport Laboratory Experiment (TSTLE), Marine Geology 400(1), 107–18, 2018.

Okazaki, H., Yoshii, T., Miyata, Y.: Analysis of morphology and grain fabric for Tsunami experimental deposits, The 124th Annual Meeting of the Geological Society of Japan, 2017.

Okazaki, H., Yoshii, T., Akiyama, D.: Three-dimensional analysis with high-frequency ground penetrating radar of tsunami experiment deposits, JpGU-AGU Joint Meeting, 2017.

Okazaki, H., Yoshii, T., Miyata, Y.: Tsunami deposits in a large wave flume and the 2011 Tohoku-oki tsunami, Annual meeting of the Sedimentological Society of Japan (SSJ), 2018.