[Aqualist] chevrons

[Patrick A Hesp]

Dear Aqualisters

the term "chevron" is a little older than the reference cited by Paul 
Hearty (Hearty et al, 1998). It was used at least as early as 1989 by 
Maxwell and Haynes.

Cooke et al. (1993) defined Maxwell and Haynes'  chevrons as " 
flow-transverse, parallel, sinuous, low-amplituide (10-30cm), 
long-wavelength (130-1,200m) belts of fine, pale sand migrating over 
darker coarse sands at rates of 500m year" (quote from Cooke et al., 1993, 
p. 325). Maxwell and Haynes reported the chevrons from SW Egypt and N 
Sudan. The pictures indicate that the chevrons are very sinuous, almost 
V-shaped, barchanoidal dunes.

References:
Cooke, RU, A. Warren and AS Goudie, 1993. Desert geomorphology. UCL Press.
Maxwell, TA and CV Haynes, 1989. Large-scale, low amplitude bedforms 
(chevrons) in the Selima Sand Sheet. Science 243: 1179-1182.

cheers 
patrick



Patrick Hesp
Professor and Graduate Director
Geography and Anthropology
Adjunct Professor in Geology and Geophysics
227 Howe/Russell, LSU
LA 70808 USA
Ph 225 5786244
http://www.ga.lsu.edu/hesp/index.html