Local glacial fluctuations and flood occurrences were investigated in the sediment sequence of proglacial Lake Muzelle - Ecrins National Park - Composite sediment sequence Muz12-I - april 2012 - (IGSN:IEFRA00A4). The sample covers the period from 303 to 2012. Based on geochemical analysis and organic matter content established using loss on ignition and reflectance spectroscopy, we identified six periods of increased glacial activity over the last 1700 yr. Each is in accordance with records from reference glaciers in the Alps. A total of 255 graded layers were identified and interpreted as flood deposits. Most of these occurred during glacial advances such as the Little Ice Age period and exhibit thicker deposits characterized by an increase in the fine grain-size fraction. Fine sediment produced by glacial activity is transported to the proglacial lake during heavy rainfall events. The excess of glacial flour during these periods seems to increase the watershed's tendency to produce flood deposits in the lake sediment, suggesting a strong influence of the glacier on flood reconstruction records. Thus, both flood frequency and intensity, which is estimated based on layer thickness as a proxy, cannot be used in reconstruction of past extreme events because of their variability. There is a need to take into account changes in sediment supply in proglacial areas that could preclude satisfactory interpretation of floods in terms of past climate variability.

Randonnées estivales du Parc national des Écrins (Hautes-Alpes et Isère). Les champs de ce jeu de données sont conformes à la première version du schéma de données pour les randonnées en cours d'élaboration. Ce schéma favorise les échanges de données entre structures productrices et utilisatrices (communautés de communes, parcs naturels, départements, offices de tourisme...). La construction de ce schéma de randonnée est collaborative, vous pourrez trouver toutes les informations liées à son avancée sur ce dépôt : https://github.com/PnX-SI/schema_randonnee.

!!le résumé de la fiche !!

Local glacial fluctuations and flood occurrences were investigated in the sediment sequence of proglacial Lake Muzelle. Composite sediment sequence Muz12-I – april 2012 (IGSN:IEFRA00A4). The sample covers the period from 303 to 2012. Based on geochemical analysis and organic matter content established using loss on ignition and reflectance spectroscopy, we identified six periods of increased glacial activity over the last 1700 yr. Each is in accordance with records from reference glaciers in the Alps. A total of 255 graded layers were identified and interpreted as flood deposits. Most of these occurred during glacial advances such as the Little Ice Age period and exhibit thicker deposits characterized by an increase in the fine grain-size fraction. Fine sediment produced by glacial activity is transported to the proglacial lake during heavy rainfall events. The excess of glacial flour during these periods seems to increase the watershed's tendency to produce flood deposits in the lake sediment, suggesting a strong influence of the glacier on flood reconstruction records. Thus, both flood frequency and intensity, which are estimated based on layer thickness as a proxy, cannot be used in reconstruction of past extreme events because of their variability. There is a need to take into account changes in sediment supply in proglacial areas that could preclude satisfactory interpretation of floods in terms of past climate variability. Glacial fluctuation Glacial focal spot