A l’aide d’un modèle numérique simple et d’observations de terrain, nous testons l’hypothèse de criticalité auto-organisé pour les crues de barrage glaciel. Le processus de crue de barrage glaciel partage des caractéristiques conceptuelles avec l’approche de criticalité auto-organisé (SOC) des systèmes complexes. Les crues déclenchées par la rupture de ces barrages glaciels ont des implications sur l’évolution géomorphologique des systèmes fluviaux proglaciaires. This global trend is related to the gradual enlargement of the lake outlet channel.ĭans cet article, nous décrivons un processus fluvial associé à la formation de barrages glaciels dans les lacs proglaciaires islandais. Analysis of the simulated time-series show that the iceberg jam floods become less frequent and more similar in magnitude over time. Based on the results of the numerical model and field observations, we suggest that iceberg jam floods should be recognized as a SOC phenomenon. The mapping of the south Vatnajökull margins between 20 reveals an increase of the calving potentiality and a rise in the likelihood of iceberg jam flood occurrence. Field observations and aerial photo-interpretations in southeastern Iceland demonstrate the occurrence of icebergs jam in ice-contact lakes. Using a simple numerical model and field observations, we test the hypothesis that iceberg jam floods exhibit SOC. The process of iceberg jam floods share some conceptual characteristics with Self-Organized Criticality (SOC) approach of complex systems. The floods triggered by the release of these iceberg jams have implications for the geomorphic evolution of the proglacial fluvial system. In this paper, we describe a fluvial marginal process associated with the formation of iceberg jams in Icelandic proglacial lakes.
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