Abstract
The stability of a gravel bed in an open-channel flow is usually described by the Shields (1936) parameter, τ*. It is roughly defined as the ratio of the frictional load on the grain (math) to the gravitational force on the grain that resists movement (math). The value of τ* = 0.03 is often used as the upper limit for bed protections. This and other correlations, e.g. Meyer-Peter/Müller (1949) yield a good estimation for practical engineering problems. However, these equations do not fully account for the physical processes that cause the instability of gravel bed.
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Detert, M., Kühn, G., Klar, M. (2003). Interaction Between Turbulent Open-Channel Flow and Pressure Fluctuations in Subsurface Gravel Layer. In: Gyr, A., Kinzelbach, W. (eds) Sedimentation and Sediment Transport. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-0347-5_11
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DOI: https://doi.org/10.1007/978-94-017-0347-5_11
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