Version 1
: Received: 7 July 2022 / Approved: 8 July 2022 / Online: 8 July 2022 (10:15:48 CEST)
How to cite:
Gomez, C.; Imai, K.; Setiawan, A.M.; Sri Hadmoko, D.; Sartohadi, J.; Saputra, A.; Bradak, B. Local Morphology and Internal Architecture of the Kawajiricho 2018 Debris-flow Deposit (Hiroshima, Japan). Preprints2022, 2022070138. https://doi.org/10.20944/preprints202207.0138.v1
Gomez, C.; Imai, K.; Setiawan, A.M.; Sri Hadmoko, D.; Sartohadi, J.; Saputra, A.; Bradak, B. Local Morphology and Internal Architecture of the Kawajiricho 2018 Debris-flow Deposit (Hiroshima, Japan). Preprints 2022, 2022070138. https://doi.org/10.20944/preprints202207.0138.v1
Gomez, C.; Imai, K.; Setiawan, A.M.; Sri Hadmoko, D.; Sartohadi, J.; Saputra, A.; Bradak, B. Local Morphology and Internal Architecture of the Kawajiricho 2018 Debris-flow Deposit (Hiroshima, Japan). Preprints2022, 2022070138. https://doi.org/10.20944/preprints202207.0138.v1
APA Style
Gomez, C., Imai, K., Setiawan, A.M., Sri Hadmoko, D., Sartohadi, J., Saputra, A., & Bradak, B. (2022). Local Morphology and Internal Architecture of the Kawajiricho 2018 Debris-flow Deposit (Hiroshima, Japan). Preprints. https://doi.org/10.20944/preprints202207.0138.v1
Chicago/Turabian Style
Gomez, C., Aditya Saputra and Balazs Bradak. 2022 "Local Morphology and Internal Architecture of the Kawajiricho 2018 Debris-flow Deposit (Hiroshima, Japan)" Preprints. https://doi.org/10.20944/preprints202207.0138.v1
Abstract
Debris-flows are recurrent events on mountain- and hill- slopes, and they have been the object of numerous field investigations and sampling, however most of this work reposes on imagery and outcrop analysis, in such a way that there are still only a handful of studies investigating the internal architecture of these events’ deposits. In the present contribution, we aims at underneath the internal structure of a portion of a debris-flow deposit that was accessible in the aftermath of the 2018 heavy-rainfall debris-flows in Hiroshima Japan. Using a Ramac Pro-Ex GPR with 500 MHz and 800 MHz antenna, a set of longitudinal and transversal transects was used to characterize the deposit. The results demonstrated that a set of subhorizontal layers have filled the valley, and interacting with local terrace edges, these layers have piled up and overcome the obstacle. Across the valleys, a set of trough suggest the presence of channels that were also filled during the event. Finally, in the channel post-event, a set of radargram “cross-bedded units” shows that the final deposition in the channel was of a more dilute flow, typical of a Newtonian flow. This set of units was not to be found at the surface of the post-event pseudo-surface, suggesting that the flow ended as a debris-flow on this surface, and that it is only when the flow dug the final channel that the nature of the flow returned from debris-flow to Newtonian flow.
Environmental and Earth Sciences, Environmental Science
Copyright:
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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