1 / 12

Giles Wiggs Sheffield Centre for International Drylands Research

Giles Wiggs Sheffield Centre for International Drylands Research Aeolian dune processes and dynamics 2004 Joint Assembly Montreal, Canada. Dunes in equilibrium…. Best 1993. Measurements of mean windspeed and sediment transport. windspeed. sand flux.

kylan-rodgers
Télécharger la présentation

Giles Wiggs Sheffield Centre for International Drylands Research

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Giles Wiggs Sheffield Centre for International Drylands Research Aeolian dune processes and dynamics 2004 Joint Assembly Montreal, Canada

  2. Dunes in equilibrium…. Best 1993

  3. Measurements of mean windspeed and sediment transport windspeed sand flux McKenna-Neumann et al 1997 Wiggs 2001

  4. U* Measurements of shear velocity shear stress mean shear velocity Wiggs 2001 Lancaster et al 1996 turbulence

  5. Measurements of Reynolds turbulent stress Reynolds stress Streamline angle

  6. Calibration of numerical models Parsons et al 2004

  7. Parsons et al 2004

  8. Werner 1995 Other modelling approaches - complex systems Baas 2002 Momiji et al 2000

  9. Other modelling approaches - analytical solutions (Hersen, Sauermann, Herrmann, Andreotti) Schwammle & Herrmann 2003 Hersen 2004

  10. Hersen et al 2004 Output sand flux Dune width

  11. Dunes in dis-equilibrium….? Hersen 2004 Parker Gay Jr 1999

  12. Conclusions • dune research is in a healthy state! • measurements of airflow structure improving BUT requires improved understanding of turbulence / sediment transport relationships • calibration of computational models allowing greater understanding of form/flow interactions • results of analytical models suggest a requirement for more fieldwork focusing on: • dynamics of sediment transfers at the dune and inter-dune scale • longer time-series measurements of dune evolution

More Related