Suspended-load experiments in a curved flume, run no. 2

Abstract

A laboratory experiment in a 180 degree curved flume with a mobile bed and suspended sediment transport is described. The flow is steady. The aim the of experiment is to obtain data on the axi-symmetrical region. The bed topography is measured by means of a profile indicator. Downstream of the bend entrance a pool and a submerged point-bar are present, here the radial bed slope is maximal. Further downstream the transverse bed slope decreases and converges to a constant transverse slope (constant with streamwise direction), here the bed topography is axi-symmetrical. Suspended sediment concentrations are determined by the method of siphoning. Concentration verticals are measured throughout the whole bend (at 1/4, 1/2 and 3/4 of the channel width). In the region were the bed topography is axi-symmetrical a denser measuring grid is used. The measurements indicate that the concentration field is also axi-symmetrical.