Dunes 2 : (1) Ridges or mounds of loose, wind-blown material, usually sand. See: Figure A-7. (2) Bed forms smaller than bars but larger than ripples that are out of phase with any water-surface gravity waves associated with them
Intergovernmental Oceanographic Commission IOC technical series 37, Tsunami Glossary (A glossary of terms and acronyms used in the tsunami literature - English), , United Nations Educational, Scientific and Cultural Organization UNESCO, Paris, France 1991. http://unesdoc.unesco.org/images/0008/000885/08853 8eb.pdf, (ND/ Tsunami Sci - Brit) {590}