Accession Number:

ADA063612

Title:

The Dynamics of Longitudinal Dunes.

Descriptive Note:

Final technical rept. Sep 76-Jul 78,

Corporate Author:

BEN-GURION UNIV OF THE NEGEV BEERSHEBA (ISRAEL) DEPT OF GEOGRAPHY

Personal Author(s):

• Tsoar,Haim

Report Date:

1978-07-01

Pagination or Media Count:

172.0

Abstract:

Longitudinal sand dunes, which are the most widespread type of dunes in the desert, are characterized by a symmetrical cross profile, a sharp edged crest and continuous elongation in one direction. Several theories have been put forward to explain some of their typical characteristics elongation for many tens of miles, equal distances between the dunes, and sinuosity of their crest lines. The present research concentrated on a field study of the mechanism of movement and advance of the longitudinal dune and on the mutual relationship between their morphology and dynamics. Research methods included field measurements like macro and micro wind direction and velocity, grain size analysis, tracing and the movement of sand grains by marking them with a fluorescent dye, analysis of the internal structure, measurement of the rate of advance and of profile changes during seasons.

Descriptors:

• *DYNAMICS
• *WIND DIRECTION
• *WIND VELOCITY
• *DUNES
• SAND
• EROSION
• SEDIMENT TRANSPORT
• SAMPLING
• STORMS
• DESERTS
• ANEMOMETERS
• MICROMETEOROLOGY

Subject Categories:

• Meteorology
• Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE