University of Natural Resources and Life Sciences, Vienna (BOKU) - Research portal
Selected Publication:
Smart, GM; Habersack, HM.
(2007):
Pressure fluctuations and gravel entrainment in rivers
J HYDRAUL RES. 2007; 45(5): 661-673.
- Abstract:
- Near-bed, sub-bed and uplift pressure fluctuations measured in New Zealand gravel bed rivers were found to have near Gaussian frequency distributions. At measurement sites the standard deviation of near-bed pressure fluctuations was approximately 3 times the local time-averaged bed shear stress. Pressure structures in the flow decayed rapidly. For the measured rivers, the near-bed pressure decorrelation time was approximately half the flow depth to shear velocity ratio. Measurements made in the middle of a flat plate in the plane of the bed and beneath the bed showed that advecting pressure fluctuations can create a vertical pressure differential in the bed surface layer that is sufficient to entrain gravel particles. Additional pressure fluctuations can be generated within mobile beds.
- Authors BOKU Wien:
- Habersack Helmut
- Find related publications in this database (Keywords)
- entrainment
- pressure fluctuation
- sediment transport
- bed load