Author(s): J. Aberle; A. Dittrich
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Keywords: Incipient motion; Roughness parameter; Steep streams; Rivermorphology
Abstract: In this study, the recently introduced roughness parameter s (standard deviation of the roughness heights, see Aberle et al., 1999) is used for the determination of incipient motion in steep streams. Relationships for the critical conditions following the Shields-parameter and the Schocklitsch type of approach are modified with the use of experimental data. The formulated relationships including the geometrical roughness parameters are independent of any grain-size. This is in agreement with the results of Parker et al. (1982), who found that the beginning of motion of bed material with a wide grain-size distribution is not dependent on only one grain size.
Year: 2001