Abstract
The fall velocities of large natural sediment particles (shingle) and of commonly used model sediments (anthracites) have been measured using a video imaging technique. The study covers a Reynolds number ranging from 35 to 23,000, a significant extension to the existing database for natural sand particles (up to 1500). Making use of the extended database, a simple empirical equation has been derived giving the relationship between the particle fall velocity and sieve diameter. Additional analysis of the drag coefficient has led to a revised formula based on that of Fredsoe and Deigaard (Mechanics of Coastal Sediment Transport. Advanced Series on Ocean Engineering, World Scientific, Singapore), providing a better fit for the data obtained at high Reynolds numbers.
| Original language | English |
|---|---|
| Pages (from-to) | 189-195 |
| Number of pages | 7 |
| Journal | Journal of Hydraulic Research |
| Volume | 43 |
| Issue number | 2 |
| Publication status | Published - 2005 |
Keywords
- Fall velocity
- settling velocity
- drag coefficient