Sediment transport and bedform development in the lee of bars: Evidence from fixed- and partially-fixed bed experiments

摘要

The co-existence, interaction, and repeated reestablishment of bars, dunes and ripples in natural channels is responsible for many important flow-form-flow dynamics. Small bedforms are constantly generated, superimposed on larger ones, particularly in zones affected by large-scale secondary circulation patterns produced by the larger bedforms. These superimposed bedforms develop on the downstream stoss slope of largerscale forms where they i) generate additional formroughness, ii) change sediment transport dynamics, iii) control bedform splitting and merging, iv) alter the geometry of the host Jee slope, and v) change the resultant sedimentary structures (Reesink & Bridge 2011; Best et al., 2013).