Measurements of sand transport by wind on a natural beach
Article first published online: 14 JUN 2006
Volume 21, Issue 2, pages 311–322, May 1974
How to Cite
SVASEK, J. N. and TERWINDT, J. H. J. (1974), Measurements of sand transport by wind on a natural beach. Sedimentology, 21: 311–322. doi: 10.1111/j.1365-3091.1974.tb02061.x
- Issue published online: 14 JUN 2006
- Article first published online: 14 JUN 2006
- Revised manuscript received 30 August 1973
Bagnold's (1954) and Kawamura's (1951) formulae may be used for the calculation of the sand movement on a natural beach, provided the shear stress velocity U* > 0·D4 m/s. Great discrepancies have been found between calculated and measured sand transport rates for U* < 0·D4 m/s, mainly because of the capillary forces acting on a wet beach.
The measured critical shear velocity U*c at the beginning of sand movement on a clean dry beach agrees very well with that predicted by Bagnold's formula. On a dry beach where the sand grains are stuck together, U*c was found to be about 10% higher. On a wet beach U*c appeared to depend on the moisture content of the surface layer. Grain size is a determining parameter in the U*c-moisture content relation.
When the angle a between the wind direction at sea and the dune face is between 15° and 85° the streamlines of the wind will bend in the vicinity of the dune face. In consequence this may influence the direction of sediment movement.