SIR-C/X-SAR Radar Studies; Impact and Aeolian Features, Borkou Region Northern Chad

Details SIR-C/X-SAR Radar Studies; Impact and Aeolian Features, Borkou Region Northern Chad SIR-C/X-SAR Radar Studies; Impact and Aeolian Features, Borkou Region Northern Chad

Mar 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27..849m&link_type=abstract

Lunar and Planetary Science, volume 27, page 849

Astronomy and Astrophysics

Astronomy

2

Aorounga, Astroblem, Dunes, Radar, Yardangs

Scientific paper

Spaceborne Radar Laboratory (SRL) multiwavelength and multipolarization images of the Borkou region in northern Chad reveal a landscape dominated by aeolian and impact processes. Steady winds in long-established patterns have cut into flat sandstones and shales to form a series of linear erosional grooves which serve as conduits for mobile sands. Dunes migrate many tens of kilometers along the grooves and, in one area, pass through the remnants of the Aorounga impact structure. Active dunes which appear distinctive on radar data with a critical incidence angle near 32 degrees (the angle of repose for medium sands) and look directions perpendicular to the direction of sand movement provide important clues to the local Saharan sand budget.

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