Fig. 11

(a) Surface strength of the man-made dunes D1-D5; (b) Surface strength of the man-made dunes D6-D11; (c) Surface strength of the trapezoidal sandy land T1-T5; (d) Surface strength of the trapezoidal sandy land T6-T11.

(a) Surface strength of the man-made dunes D1-D5; (b) Surface strength of the man-made dunes D6-D11; (c) Surface strength of the trapezoidal sandy land T1-T5; (d) Surface strength of the trapezoidal sandy land T6-T11.