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The forces acting on a revetment block used for an element of roughness of the bed in open channel flows were measured by using a three components load cell. The ratio Hp/ ha of the water depth above the blokes Hp to the height of the revetment block ha was 2.1. Turbulent structures of the flow above the revetment blokes were also measured by using a Laser Doppler anemometer (LDA). The friction velocities near the boundary between the top part of blocks and flow were evaluated from the Reynolds stress measured by LDA . These values are nearly equal to the values evaluated from the energy gradient of flow, but less than the values estimated from the drag forces acting on a revetment block. The ratio ks/kc of the equivalent roughness ks for the block to the characteristic height kc of the block is about 1.6.

FLOW-INDUCED FORCES ACTING ON A REVETMENT BLOCK WITH LARGE HEIGHT RELATIVE TO WATERDEPTH OF OPEN-CHANNEL FLOWS