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(Article of periodic en Anglais - 2009)

Document title

Turbulence fields in the lee of two-dimensional transverse dunes simulated in a wind tunnel

Authors(s) and Affiliation(s)

DONG Z. (1 2) ; QINAN G. (2) ; LU P. (2) ; LUO W. (2) ; WANG H. (2) ;
(1) Dep. of Geography, Shaanxi Normal Univ., Xi'an, CHINE
(2) Key Laboratory of Desert and Desertification, CAREERI, CAS, Gansu Province, Lanzhou, CHINE

Abstract

The AA. used particle image velocimetry in a wind tunnel simulation to obtain detailed velocity measurements in the lee of two-dimensional transverse dune models, then used the results to analyse their turbulence fields. The dune models used in this study had a single lee angle of 30°, and a total of 6 stoss angles between 3° and 25°. The AA. used vorticity, turbulence intensity, Reynolds stress and tubulent kinetic energy to characterize the turbulence fields. These parameters were functions of stoss angle, wind velocity, distance from the dune crest and height above the ground surface. The stoss angles could generally be divided into 2 groups based on the profiles of mean velocity turbulence and Reynold stress. The stoss angles of 15° and 20° may have special sigificance in dune development given the characteristics of the mean velocity fields and turbulence fields they produce within the lee airflow. It is the streamwise velocity component and its turbulence that determine the surface shear stress

Source

Article of periodic

published at : Earth surface processes and landforms / ISSN 0197-9337 / CODEN ESPLDB

Editor : Wiley, Chichester - ROYAUME-UNI (1981)

Millesime : 2009, vol. 34, no2 [pp. 204-216]

Bibliographic references : 1 p.

Collation : 14 fig.

Language

Anglais

INIST-CNRS, Cote INIST : 17355

Digital Object Identifier

Go to electronic document thanks to its DOI : doi:10.1002/esp.1704

Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI), 2009
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