Description

The Maurienne valley downstream of Modane is characterised by numerous hydroelectric facilities and communication routes (railway, national road and highway) in a narrow valley that receives abundant sedimentary inputs from the entire watershed. These inputs are very important especially in fine sediments due to the lithology of some sub-basins pouring on the left bank of the Arc en Maurienne (black marls very erodable), especially by the Arvan torrent. Thus, the concentrations of Suspension Matter (MES) naturally observed in the river are very high, ranging from a few grams per litre to several tens of grams per litre during major hydrological events or torrential lava events. These high concentrations can have a strong impact on river morphodynamics, particularly on the deposition potential on pebble banks. The Arc-Isère experimental basin aims to better understand the dynamics of the MES and to estimate the possible evolutions of the Arc and Isère and the impact of hydroelectric development. To do this, it is important to clearly identify river intakes of both water and sediment and to assess the interactions between suspended sediments and the river bed. The rivers of the Arc and Arvan, its tributary, are each equipped with two limnimetric and turbidimetric measuring stations for large concentration ranges. Turbidity chronics are converted into suspended solid concentration chronics by analysis of manually collected samples and using automatic picker. The Isère is also equipped with several hydro-sedimentary measuring stations managed by scientific partners.

Resources

Name	Format	Description	Link
	0		https://www.data.gouv.fr/fr/datasets/r/b931f849-6af3-4a58-92e0-3a893da52326

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