Abstract
Present paper describes the origin of step-pool systems that is found in authors' flume experiments with gravel beds, and proposes guide lines for design of them basing on the formation mechanisms. Step-pools are generated due to the interaction of antidunes and three-dimensional surface waves (diagonal cross waves) on supercritical flow. When wave lengths of the antidunes and the water surface waves coincide with each other, the two dimensional undulation of antidunes turns out to be three dimensional one gradually and then the surface waves begin to be amplified. Through the sorting of bed material, the steps become strong instructure. Therefore, it is possible to consider that the generation condition of step-pools is the coincidence of wave lengths of antidunes and surface waves. By using the knowledge, guide lines for artificial construction of them is proposed.
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