Etude générale sur les seuils de correction torrentielle et les plages de dépôts

Couvert, Bernard; Lefebvre, Benjamin; Lefort, Ph.; Morin, Émilie

doi:10.1051/lhb/1991043

Cited by 8 publications

(6 citation statements)

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“…If considerable theoretical and numerical works have been performed on the size, shape and structure of torrential check dams, 1404 A. Remaître et al: Influence of check dams on debris-flow run-out intensity allowing the definition of general design criteria (Johnson and McCuen, 1989;Couvert et al, 1991;Armanini and Scotton, 1992;Deymier et al, 1994;Miyazawa et al, 2003), it is worth noting that less research has focused on the optimal number and location of these dams along the debris-flow pathway.…”

Section: Introductionmentioning

confidence: 99%

Influence of check dams on debris-flow run-out intensity

Remaître¹,

Asch

Malet

et al. 2008

Nat. Hazards Earth Syst. Sci.

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Abstract. Debris flows are very dangerous phenomena claiming thousands of lives and millions of Euros each year over the world. Disaster mitigation includes nonstructural (hazard mapping, insurance policies), active structural (drainage systems) and passive structural (check dams, stilling basins) countermeasures. Since over twenty years, many efforts are devoted by the scientific and engineering communities to the design of proper devices able to capture the debris-flow volume and/or break down the energy. If considerable theoretical and numerical work has been performed on the size, the shape and structure of check dams, allowing the definition of general design criteria, it is worth noting that less research has focused on the optimal location of these dams along the debris-flow pathway.In this paper, a methodological framework is proposed to evaluate the influence of the number and the location of the check dams on the reduction of the debris-flow intensity (in term of flow thickness, flow velocity and volume). A debris-flow model is used to simulate the run-out of the debris flow. The model uses the Janbu force diagram to resolve the force equilibrium equations; a bingham fluid rheology is introduced and represents the resistance term. The model has been calibrated on two muddy debris-flow events that occurred in 1996 and 2003 at the Faucon watershed (South French Alps).Influence of the check dams on the debris-flow intensity is quantified taking into account several check dams configurations (number and location) as input geometrical parameters. Results indicate that debris-flow intensity is decreasing with the distance between the source area and the first check dams. The study demonstrates that a small number of check dams located near the source area may decrease substantially the debris-flow intensity on the alluvial fans.

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Section: Introductionmentioning

confidence: 99%

Influence of check dams on debris-flow run-out intensity

Remaître¹,

Asch

Malet

et al. 2008

Nat. Hazards Earth Syst. Sci.

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“…Several approaches and tools based on complex relationships among hydraulic, geometric, and sediment variables have been developed in order to estimate the size of the scour pit. Two reliable methods, commonly used in torrent protection structures context, are those developed by VAWE and SOGREAH (Couvert, B. et al, 1991). More recent tools, based on laboratory experiments and field measurements have been proposed by Comiti et al (Comiti et al, 2013).…”

Section: Step 3: Local Scouring Estimationmentioning

confidence: 99%

Deterioration modeling and maintenance assessment using physics-informed stochastic Petri nets: Application to torrent protection structures

Chahrour

Nasr

Tacnet

et al. 2021

Reliability Engineering & System Safety

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Mountain territories are remarkably exposed to natural phenomena such as torrential floods, arising due to climate and geophysical environmental changes. Protection structures deteriorate with time due to the harsh phenomena they are subjected to since their construction. If not regularly maintained, the level of protection offered by these structures will be reduced. The methodology presented in this paper integrates physics-based and dependability models for monitoring the state evolution of protection structures and improving maintenance decision-making processes. The modeling approach proposed is based on 1) physics-based modeling for identifying the probabilistic laws of the transition times between the defined states of the structure depending on its behavior over time and 2) a decision aiding method based on Petri nets, which helps in choosing the best maintenance strategy while considering budgetary constraints. This approach is applied on a check dam located within a series of check dams in the Manival torrent in Saint-Ismier, France.

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“…Chaque fois que possible, nous avons confronté cette approche à un calcul basé sur la hauteur critique. En effet sur forte pente, le nombre de Froude oscillant rapidement de part et d'autre de l'unité, le régime critique peut constituer une approximation acceptable des conditions d'écoulement [2][3]. Le calcul sur la hauteur critique a conduit à confirmer ou à fixer rétrospectivement la valeur du coefficient de rugosité K de la formule de Manning-Strickler.…”

Section: • Reconstitution Des Débits Liquidesunclassified

“…sant un enfoncement régressif de l'écoulement dans les dépôts de la retenue [3]. Une rupture par affouillement du pied de l'ouvrage aurait probablement conduit à une rupture plus massive de la digue.…”

Section: Transport Solideunclassified