ABSTRACT
This work assesses experimentally the detailed characterization of a 90º intake’s bed morphology time evolution, under live-bed flow conditions, and the complex 3D-flow pattern for the equilibrium bed. The experimental facility included two diversion rectangular channels. The experiment started from a concordant flat sand bed at the diversion reach. The diversion discharge ratio was 0.2. In both channels, the bed elevations were measured with Mini Echo-Sounders along time, and for the fixed and deformed bed, 3D velocity measurements were taken using a side-looking Acoustic Doppler Velocimeter at more than 8000 points. Erosion was more significant in the main channel right downstream of the diversion and in the outer wall of the intake. Inside the intake, there is a separation zone whose length decreases and width increases near the free surface.
