| Autor: |
James D. Iversen, Keld Rømer Rasmussen |
| Jazyk: |
angličtina |
| Rok vydání: |
1999 |
| Předmět: |
|
| Zdroj: |
Iversen, J D & Rasmussen, K R 1999, ' The effect of wind speed and bed slope on sand transport ', Sedimentology, vol. 46, no. 4, pp. 723-731 . https://doi.org/10.1046/j.1365-3091.1999.00245.x |
| DOI: |
10.1046/j.1365-3091.1999.00245.x |
| Popis: |
This paper reports on a wind tunnel study of the effects of bed slope and wind speed on aeolian mass transport. The use of a sloping wind tunnel has enabled estimation of the friction angle α to be about 40°for saltating particles in the range 170-540 μm. A formula relating dimensionless mass transport to friction speed and bed slope is proposed, and mass transport data for five uniform sand samples and one non-uniform sand sample are shown to fit the equation well. In particular, the relationship reveals an overshoot in mass transport slightly above threshold collisions, a feature also evident when previous experimental data is re-examined. As the number of mid-air collisions between the saltating particles increases greatly with wind speed, the overshoot may occur as a result of increasing energy losses resulting from the collisions. Finally, it is demonstrated that data for saltating snow shows a similar overshoot in the dimensionless transport rate. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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