Sediment dynamics in the Gulf of Lion (NW Mediterranean Sea) during two autumn–winter periods with contrasting meteorological conditions

•Strong interannual variability of the sediment dynamics in the Gulf of Lion.•Massive sediment accumulation near the Rhone River mouth (∼56 % of the river inputs)•Sediment deficit on the inner shelf due to the long-term reduction of the Rhone inputs.•Storm-induced sediment accumulation in the southwestern Gulf of Lion.•Cold winters mainly impact the southwestern and outer shelf and the submarine canyons.