SEDIMENTARY PROCESSES/Aeolian Processes 613 Figure Modes of sediment transport by the wind Reproduced with permission from Pye K (1987) Aeolian Dust and Dust Deposits London: Academic Press Figure Transport of sediment by the wind (A) Relation between threshold wind shear velocity and particle size (from Bagnold RA (1941) The Physics of Blown Sand and Desert Dunes, p 265 London: Chapman and Hall) (B) Mass flux of sand as a function of wind shear velocity Data from laboratory wind tunnel experiments (from Lancaster, 1995) (C) Relations between horizontal flux of sand sized particles and vertical flux of dust (from Nickling WG, McTainsh GH, and Leys JF (1999) Dust emissions from the Channel Country of western Queensland, Australia Zeistchrift fuăr Geomorphologie, Supplement Bd 116: 17.) Data from field experiments