Spatial and temporal variability in sedimentation rates associated with cutoff channel infill deposits: Ain River, France

摘要: Floodplain development is associated with lateral accretion along stable channel geometry. Along shifting rivers, the floodplain sedimentation more complex because of changes in position but also cutoff presence, which exhibit specific overflow patterns. In this contribution, spatial and temporal variability rates infill deposits related to a gravel bed river (Ain River, France). The estimated from dendrogeomorphic analysis are compared between within 14 infills. Detailed analyses single performed assess through time by analyzing activity profiles fallout radionuclides 137Cs unsupported 210Pb. Sedimentation infills other plots located adjacent floodplain. range 0.65 2.4 cm a1 over period 10 40 years. data provide additional information on role distance bank, overbank flow frequency, geometry controlling rate. Channel infills, lower than floodplains, higher convey sediment farther away Additionally, degradation, aggradation, bank erosion, reduce or increase main aquatic zone, affect local magnitude frequency therefore rates, thereby creating mosaic zones Last, approaches cross validated for estimating rate