Sedimentary processes on an intertidal mudflat in the upper macrotidal Seine estuary, France

摘要: Abstract In order to understand the hydrodynamic parameters that control fluvial sediment dynamics on an intertidal mudflat located in a sheltered zone upper part (fluvial part) of macrotidal Seine estuary (France), two-year field study high-frequency measurements was carried out. The bed-level evolution surface measured from semi-diurnal period annual time scales using high-resolution altimeter. data showed sedimentary patterns were mainly controlled by river flows and tides. During high winter, sedimentation dominated; suspended particulate matter concentrations higher, submersion constant at scale, duration more important than erosion due asymmetrical tide. By contrast during low summer, dominated as result immersion/emersion tidal flats cycle. From this sedimentation–erosion cycle we identify temporary storage 10–30% fine-grained ( River-related fluxes estimated measurement zones estuary. erosion/sedimentation processes perennial, amounts contributing sediments directly related solid load. Our results indicate mudflats play role downstream transfer (SPM) towards turbidity maximum Rouen docks particularly flows, when roughly 30–50% SPM originates eroded flats.