Fig. 4

(a)The man-made dune patterning; (b) The trapezoidal sandy land patterning. (c) The actual field scene of the man-made dune; (d) The actual field scene of the trapezoidal sandy land.

(a)The man-made dune patterning; (b) The trapezoidal sandy land patterning. (c) The actual field scene of the man-made dune; (d) The actual field scene of the trapezoidal sandy land.