Breakwater 4 : An offshore or onshore structure, such as a wall, water gate, or other in-water wave-dissipating object that is used to protect a harbour or beach from the force of waves
International Tsunami Information Center (A UNESCO/IOC-NOAA Partnership), Honolulu, HI, USA 2013.http://itic.ioc-unesco.org/index.php?option=c om_content&view=article&id=1868:online-glo ssary-2013328&catid=1142&Itemid=2435, (ND/ Tsunami Emr - Amer) {959}
Intergovernmental Oceanographic Commission IOC, Tsunami Glossary, Paris, UNESCO, IOC Technical Series No. 85 (English.), United Nations Educational, Scientific and Cultural Organization, Paris, France 2008. (Printed by NOAA, The International Tsunami Information Center, Hawaii, USA). http://walrus.wr.usgs.gov/news/tsunami_glossary_sm all.pdf, (ND/ Tsunami Sci and Emr - Amer) {96}