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L'estimation des volumes des laves torrentielles : méthodes disponibles et application au torrent du Poucet (Savoie)

Abstract : The engineers dealing with torrential risks often need to estimate debris flows volumes. This is a difficult task, notably because of the poor knowledge of triggering mechanisms and the complexity of flow processes. On the other hand, debris flows often form typical deposits whose volume may be estimated and recorded. So, a significant amount of data may prove available for developing and testing methods for the assessment of debris flow volumes. This paper presents, in a detailed way, three kinds of global methods and their application to a case-study, the assessment of debris flows volumes for the Poucet torrent (Savoy, France): from frequency analysis carried out on a historical time-series (section 2), with the help of basic models (section 3), and at last, using a geomorphological approach (section 4). The comparison between the results shows a large scattering. On the basis of the characteristics of considered methods and previous validation works, the conclusion recommends, for engineering purposes, a combined approach with emphasis on frequency analysis and geomorphological methods.
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https://hal.inrae.fr/hal-02580792
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Submitted on : Thursday, May 14, 2020 - 8:38:18 PM
Last modification on : Friday, April 16, 2021 - 3:30:00 AM

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Sylvie Brochot, Lara Marchi, M. Lang. L'estimation des volumes des laves torrentielles : méthodes disponibles et application au torrent du Poucet (Savoie). Bulletin of Engineering Geology and the Environment, Springer Verlag, 2002, 61, pp.389-402. ⟨10.1007/s10064-002-0164-3⟩. ⟨hal-02580792⟩

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