Packet 2: Tossup 20

The Lettau equation modeling the movement of this substance agrees with Pierre-Yves Belly’s experiments verifying the Kawamura curve. The RDP/DP ratio was introduced to model the movement of this solid substance, which corresponds to anything between -1 and 4 on the (15[1])Krumbein phi (-5[1])scale. (-5[1])The movement of this substance (-5[1])is proportional to (15[1])the square root of d over (15[1])250 (15[1])micrometers times u-star cubed according to the (*) Bagnold (“BAG-nohld”) formula. (10[1])This (10[1]-5[1])substance (10[2])can (10[1])be horizontally (10[1])secured with a groin. (10[1]-5[1])This (10[1])material (10[1])moves by saltation (10[3]-5[1])from the (10[1])stoss (10[1]-5[2])to the lee side of (-5[1])certain features (10[1])which (10[1])come (10[2])in (10[1])“barchan” (10[2]-5[1])and “parabolic” (10[1])types. (10[2])The vast majority of the Earth’s mobile form of this material (10[1]-5[1])is found in ergs. (10[1]-5[1])For 10 points, name this material that makes up dunes. (10[2])■END■ (10[11])

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