Arcuate Niger Delta coast experiences largest summer (winter) erosion (accretion).
9.1 km2 deltaic land lost to erosion from 2010 to 2012 due to Niger channel dredging.
Degeneration of link between fluvial sediment flux and coastal hydrodynamics exists.
Human interference to deltaic system reduced sediment delivery to delta coast.
Delta coast influences by cross- (long-) shore transport at short- (long) term.