Local glacial fluctuations and flood occurrences were investigated in the sediment sequence of proglacial Lake Muzelle - Parc national des Ecrins (PNE) - Séquence sédimentaire composite Muz12-I – april 2012 (IGSN:IEFRA00A4). The sample covers the period from 303 to 2012. Granulometry - 2017 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. Glacial fluctuations Glacial focal spot LTER - ZA - RZA Zone Atelier Alpes ZAA

Local glacial fluctuations and flood occurrences were investigated in the sediment sequence of proglacial Lake Muzelle - Ecrins national Park - Composite sequence Muz12-I - april 2012 (IGSN:IEFRA00A4). Field mission 04 october 2012 (Mission "THESE FOUINAT MUZELLE L10/04/2012"). Project "THESE 2 ALPES PN ECRINS". Head of mission Pierre Sabatier The sequence covers the period from year 303 to 2012. Roman era to contemporary era. Glacial fluctuation LTER - ZA - RZA Zone Atelier Alpes ZAA

Mountain lakes are often situated in protected natural areas, a feature that leads to their role as sentinels of global environmental change. The data contain the grid data of bathymetry measured in Lake Muzelle in the Massif des Ecrins (WGS 84). LTER - ZA - RZA Zone Atelier Alpes ZAA