English
 
Privacy Policy Disclaimer
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT
 
 
DownloadE-Mail
  Simplified simulation of rock avalanches and subsequent debris flows with a single thin-layer model: Application to the Prêcheur river (Martinique, Lesser Antilles)

Peruzzetto, M., Levy, C., Thiery, Y., Grandjean, G., Mangeney, A., Lejeune, A.-M., Nachbaur, A., Legendre, Y., Vittecoq, B., Saurel, J.-M., Clouard, V., Dewez, T., Fontaine, F. R., Mergili, M., Lagarde, S., Komorowski, J.-C., Le Friant, A., Lemarchand, A. (2022): Simplified simulation of rock avalanches and subsequent debris flows with a single thin-layer model: Application to the Prêcheur river (Martinique, Lesser Antilles). - Engineering Geology, 296, 106457.
https://doi.org/10.1016/j.enggeo.2021.106457

Item is

Files

show Files
hide Files
:
5011927.pdf (Postprint), 5MB
Name:
5011927.pdf
Description:
-
Visibility:
Public
MIME-Type / Checksum:
application/pdf / [MD5]
Technical Metadata:
Copyright Date:
-
Copyright Info:
-
License:
-

Locators

show

Creators

show
hide
 Creators:
Peruzzetto, Marc1, Author
Levy, Clara1, Author
Thiery, Yannick1, Author
Grandjean, Gilles1, Author
Mangeney, Anne1, Author
Lejeune, Anne-Marie1, Author
Nachbaur, Aude1, Author
Legendre, Yoann1, Author
Vittecoq, Benoit1, Author
Saurel, Jean-Marie1, Author
Clouard, Valérie1, Author
Dewez, Thomas1, Author
Fontaine, Fabrice R.1, Author
Mergili, Martin1, Author
Lagarde, Sophie2, Author              
Komorowski, Jean-Christophe1, Author
Le Friant, Anne1, Author
Lemarchand, Arnaud1, Author
Affiliations:
1External Organizations, ou_persistent22              
24.6 Geomorphology, 4.0 Geosystems, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum, ou_146045              

Content

show
hide
Free keywords: -
 Abstract: High discharge debris flows in mountainous and volcanic areas are major threats to populations and infrastructures. Modeling such events is challenging because the associated processes are complex, and because we often lack data to constrain rheological parameters. In this work, we show how extensive field data can help model a rock avalanche, and the subsequent remobilization of the deposits as a high discharge debris flow, with a single one-phase thin-layer numerical code, SHALTOP, and up to two rheological parameters. With the Prêcheur river catchment (Martinique, Lesser Antilles) as a case study, we use geological and geomorphological data, topographic surveys, seismic recordings and granulometric analyses to define realistic simulation scenarios and determine the main characteristics of documented events for model calibration. Then, we model a possible 1.9 × 106 m3 rock avalanche. The resulting deposits are remobilized instantaneously as a high discharge debris flow. We show that, for a given unstable volume, successive collapses allow to better reproduce the dynamics of the rock avalanche, but do not change the geometry of the final deposits, and thus the initial conditions of the subsequent debris flow simulation. The location of the debris flow initiation has also little influence on simulation results. However, progressive remobilization of materials slows down the debris flow and limits overflows, in comparison to an instantaneous release. Nevertheless, high discharge debris flows are well reproduced with an instantaneous initiation. Besides, the range of travel times measured for other significant debris flows in the Prêcheur river is consistent with our simulation results.

Details

show
hide
Language(s):
 Dates: 20212022
 Publication Status: Finally published
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1016/j.enggeo.2021.106457
GFZPOF: p4 T5 Future Landscapes
OATYPE: Green Open Access
 Degree: -

Event

show

Legal Case

show

Project information

show

Source 1

show
hide
Title: Engineering Geology
Source Genre: Journal, SCI, Scopus
 Creator(s):
Affiliations:
Publ. Info: -
Pages: - Volume / Issue: 296 Sequence Number: 106457 Start / End Page: - Identifier: CoNE: https://gfzpublic.gfz-potsdam.de/cone/journals/resource/journals116
Publisher: Elsevier