Reply to: Dubois, R. N., 2000. Discussion of: E. Robert Thieler, Orrin H. Pilkey, Jr., Robert S. Young, David M. Bush, and Fei Chai, 2000. The use of mathematical models to predict beach behavior for US coastal engineering: A critical review. Journal of Coastal Research, 16 (1), 48-70. Journal of Coastal Research, 16 (3), 946-949.