Cross Sections of Wind Ripples on Various Slopes of Sand Dunes(<Featured Articles>Turkey-Japan Joint Conference on Geomorphology)

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We collected 684 cross sections of wind ripples from various slopes at the Tottori Sand Dunes, southwest Japan, by adopting a simple method that involves the use of a transparent plate. We analyzed the geometric characteristics of wind ripple shapes in relation to the proceeding (marching, climbing) angles of ripples. The results show that the wave-lengths of ascending wind ripples were larger than those of the descending ones: as the proceeding angles increased, the waves became longer. The cross-sectional shapes were classified into four types according to the proceeding angles. The critical proceeding angles of the wind ripples under the ascending and descending conditions were 24° and 17°, respectively; these angles might be controlled by an angle of repose on the stoss- and lee-side slopes of the ripples, respectively.
2011-04-25