Effect of stress history on sediment transport and channel adjustment in graded gravel-bed rivers

Abstract. With the increasing attention on environmental flow management for maintenance of habitat diversity and ecosystem health mountain gravel-bed rivers, much interest has been paid to how inter-flood low can affect river morphodynamics during subsequent flood events. Previous research found that antecedent conditioning lead an increase in critical shear stress a reduction sediment transport rate flood. However, long this effect last event not fully discussed. In paper, series flume experiments with various durations are presented study problem. Results show channel morphology adjusts significantly within first 15 min but becomes rather stable remainder flow. The implementation indeed hydrograph, such is limited relatively short time at beginning hydrograph. This indicates bed reorganization phase, which induces history effect, likely be erased intensity event.