Model Tests on the CERC Full Scale Test Floating Breakwater

摘要

Model tests with a floating breakwater in short-crested waves have been performed in scale 1:10. The breakwater is a model of a 2-pontoon CERC prototype. 2 versions are tested: fendered and stiff. Some tests in long-crested waves are also included. Wave elevation, anchor line forces, breakwater motions and hydrodynamic pressures have been measured. Simple numerical simulations of forces and motions are made. Experimental wave reduction is studied through maximum and significant wave heights and wave spectra. Wave transmission varies from 30% for 2s waves to 100% for 6s waves (full scale). Control of wave statistics and grouping is included. Waves in front of the model are also studied. Maximum and RMS values, auto- and cross-spectra, linear transfer functions and amplitude statistics of forces and motions are presented. The maximum force in a single sensor was 102 kN, while in a single anchor line it was larger than 105 kN. Non-linearities in motions and forces result in significantly larger extremes than predicted by linear theory. Preliminary comparisons to field measurements are made for waves and mooring forces. Keywords: Coastal engineering; Water waves. Norway. (edc)