| Consists of a rotating circular channel with a lid at the surface. Both elements rotate independently in opposite directions in order to avoid secondary flows. The flume has a mean external diameter of 3.7 m, a width of 0.30 m and a variable water depth between 0.39 and 0.47 m. The flume simulates different hydrodynamic conditions, including steady and periodic flows.
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During the experiments, the suspended sediment concentration is measured
by an optical probe (OSLIM). The erosion tests are performed on a
sediment layer. The erosional behaviour of each sediment is determined
by increasing the bed shear stress in successive steps until bottom
sediment will ressuspend. The deposition tests consists of an initial
mixing period followed by successive steps in which the bed shear stress
is lowered until sediment in suspension starts to settle.
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