JpGU-AGU Joint Meeting 2017

Presentation information

[EJ] Poster

H (Human Geosciences) » H-CG Complex & General

[H-CG30] [EJ] Interdisciplinary approach to earth's changing surface

Wed. May 24, 2017 5:15 PM - 6:30 PM Poster Hall (International Exhibition Hall HALL7)

[HCG30-P02] Three-dimensional analysis with high-frequency ground penetrating radar of tsunami experiment deposits

*Hiroko Okazaki1, Takumi Yoshii2, Daichi Akiyama3 (1.Division of Earth Science, Natural History and Institute, Chiba, 2.Central Research Institute of Electric Power Industry, 3.Graduate School of Frontier Science, The University of Tokyo)

Keywords:tsunami deposits, GPR, experiment

A tsunami experiment was conducted in a wave flume (205m in length, 60cm in width, 95cm in depth) in CRIEPI (March 1, 2016). GPR (Ground Penetrating Radar) scanning with a high frequency antenna (1.6GHz) was performed for the experiment deposits. The used material was sand (median, 0.2mm) and dune (20cm in height) was formed in the center of flume. A tsunami (wave height, 80cm) went over the dune, and run up to the landside, and deposited sand layer, 1-3cm in thickness. The GPR measurement was carried out for 10 m long around the dune. GPR profiles show three-dimensional low basin-shaped reflection around the dune, and parallel reflection consisting of two levels that was a gently convex upward in the landside. This result matches the CT result (Yoshii et al., 2016). The trench of the deposits confirmed that the low basin-shaped reflection was caused by the hydraulic jump at dune. As for the tsunami deposit, it was revealed that the boundary surfaces between different two layers (the lower coarse-grained sand layer and the upper fine-grained sand layer) became the gently convex upward reflection.

Yoshii T., M. Matsuyama and S. Tanaka (2016) Sedimentary characteristics of tsunami deposits made in wave flume. JpGU2016. MIS11-P18.