Fig. 4
Plane bed regime in a space of particle Reynolds number \({\mathrm{Re}}_{\mathrm{p}}\) versus suspension index \({u}_{*}/{w}_{\mathrm{s}}\). The dotted line denotes the threshold condition for particle motion (Eq. 5). The solid line denotes the threshold condition for sediment suspension (Eq. 6). Both lines were extended to \({\mathrm{Re}}_{\mathrm{p}}\) = 10–1 and 105. The plane bed data are divided into two separate regions: the region around the threshold condition of particle motion and the region above the threshold condition of suspension