• norsk
    • English
  • English 
    • norsk
    • English
  • Login
View Item 
  •   Home
  • Faculty of Mathematics and Natural Sciences
  • Geophysical Institute
  • Geophysical Institute
  • View Item
  •   Home
  • Faculty of Mathematics and Natural Sciences
  • Geophysical Institute
  • Geophysical Institute
  • View Item
JavaScript is disabled for your browser. Some features of this site may not work without it.

Drag coefficient reduction at very high wind speeds

Bye, John A. T.; Jenkins, Alastair D.
Peer reviewed, Journal article
Thumbnail
View/Open
Jenkins6.pdf (173.7Kb)
URI
https://hdl.handle.net/1956/1152
Date
2006-03-31
Metadata
Show full item record
Collections
  • Geophysical Institute [740]
Original version
https://doi.org/10.1029/2005jc003114
Abstract
The correct representation of the 10-m drag coefficient for momentum (K10) at extreme wind speeds is very important for modeling the development of tropical depressions and may also be relevant to the understanding of other intense marine meteorological phenomena. We present a unified boundary layer model for (K10), which takes account of both the wave field and spray production, and asymptotes to the growing wind wave state in the absence of spray. The theoretical development is based on an air-sea system with shear layers in both fluids and contains three constants that must be determined empirically. This is done using data from observations, and the resulting behavior is interpreted in terms of spray. A feature of the results is the prediction of a broad maximum in K10. For a spray velocity of 9 m s-1, it is found that a maximum of K10 ~ 2.0 × 10-3 occurs for a 10-m wind speed, u10 ~ 40 m s-1, in agreement with recent GPS sonde data in tropical cyclones. Thus K10 is ‘‘capped’’ at its maximum value for all higher wind speeds expected. A physically based model, where spray droplets are injected horizontally into the airflow and maintained in suspension by air turbulence, gives qualitatively similar results. The effect of spray is also shown to flatten the sea surface by transferring energy to longer wavelengths.
Publisher
American Geophysical Union

Contact Us | Send Feedback

Privacy policy
DSpace software copyright © 2002-2019  DuraSpace

Service from  Unit
 

 

Browse

ArchiveCommunities & CollectionsBy Issue DateAuthorsTitlesSubjectsDocument TypesJournalsThis CollectionBy Issue DateAuthorsTitlesSubjectsDocument TypesJournals

My Account

Login

Statistics

View Usage Statistics

Contact Us | Send Feedback

Privacy policy
DSpace software copyright © 2002-2019  DuraSpace

Service from  Unit