Round 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 Krumbein phi scale. The movement of this substance is proportional to the square root of d over 250 micrometers times u-star cubed according to the (*) Bagnold (“BAG-nohld”) formula. This substance can be horizontally secured with a groin. This material moves by saltation (10[1])from the stoss to the lee side of certain features which come in “barchan” and “parabolic” types. The vast majority of the Earth’s mobile form of this material is found in ergs. For 10 points, name this material that makes up dunes. ■END■ (10[1])

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