Abstract
Step–pool channel units are common in steep terrain with channel gradients greater than a few percent. Such features are dominated by boulders and cobbles that interact to help lock the bed in place. The interlocking of grains results in the formation of steps over which water plunges, enhancing the formation of downstream pools. Step–pools tend to display a characteristic spacing and size that depends on channel slope, grain size, and channel width. The complex flow conditions associated with step–pools make the prediction of water depths, velocities, and sediment transport difficult; these questions remain an active area of research.
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