When do logs move in rivers?

@article{Braudrick2000WhenDL,
  title={When do logs move in rivers?},
  author={Christian A. Braudrick and Gordon E Grant},
  journal={Water Resources Research},
  year={2000},
  volume={36},
  pages={571 - 583}
}
Large woody debris is an integral component of forested, fluvial systems throughout the world, yet we know little about hydraulic thresholds for movement and transport of logs. We developed theoretical models of entrainment and performed flume experiments to examine thresholds for wood movement in streams. Both the model and the experiments indicate that log entrainment is primarily a function of the piece angle relative to flow direction, whether or not the log had a rootwad, the density of… 

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[1] In small and intermediate sized streams, the interaction between wood and bed material transport often determines the nature of the physical habitat, which in turn influences the health of the

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