Experimental study of the variability of sediment transport processes under outburst flood conditions in mountain streams - Archive ouverte HAL
Communication Dans Un Congrès Année : 2024

Experimental study of the variability of sediment transport processes under outburst flood conditions in mountain streams

Résumé

To date, little is known on the features of sediment transport processes that can be triggered by an outburst flood for given field conditions. We present the results of 94 experiments carried out in a 5.0 m-long, 0.2 m-wide flume, mimicking the conditions of outburst floods on steep slopes, where water is suddenly released upstream of an erodible bed constituted of sand. Investigated slope gradients cover the range 1.7 to 38.0 %. Flow features are qualitatively analysed using pictures taken by video cameras. We emphasize analysis of the flow front features, and internal shear inside the flow. At gentle slope, the wave propagation is mainly constituted of water with limited sediment transport. When increasing the slope, a series of processes are evidenced, and lead to very concentrated rapid mass flows. We try to classify the observed flows in reference to well-known field phenomena. We finally suggest a continuum of sediment transport processes from bedload to debris flows.
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Dates et versions

hal-04432354 , version 1 (01-02-2024)

Identifiants

  • HAL Id : hal-04432354 , version 1

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Dominique Laigle, Loïs Ribet. Experimental study of the variability of sediment transport processes under outburst flood conditions in mountain streams. Interpraevent 2024 : Natural hazards in a changing climate, Jun 2024, Vienne, Austria. ⟨hal-04432354⟩
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