Rupprecht, SPeter, MBennetts, LChung, H2015-10-142015-10-142015-04-122015-04-1230th International Workshop on Water Waves and Floating Bodies held at Bristol University, Bristol UK, 2015-04-12 to 2015-04-15, published in: Proceedings of 30th International Workshop on Water Waves and Floating Bodieshttps://hdl.handle.net/10292/9111Simulations obtained for water waves over rough seabed and waves in rough in vacuo plate. Attenuation rates of effective and individual wave fields extracted, compared and found to differ.The workshop proceedings are freely accessible through the dedicated internet address www.iwwwfb.org where all contributions from 1986 on can be found.Conference ContributionOpenAccess