Model Tests on the CERC Full Scale Test Floating Breakwater

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Abstract:

Model tests with a floating breakwater in short-crested waves have been performed in scale 110. 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.

Author(s):
Torum, A. ; Stansberg, C. T. ; Ottera, G. O. ; Slattelid, O. H.
Author Organization(s):
MARINTEK TRONDHEIM (NORWAY)
Descriptive Note:
Final rept. Aug 1986-Jun 1989
Supplementary Note:
Original contains color plates: All DTIC/NTIS reproductions will be in black and white.
Pagination:
0229

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release
Distribution Statement:
Approved For Public Release; Distribution Is Unlimited.

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
R/D-4907-EN-01
Contract/Grant Number(s):
DAJA45-86-C-0035
Monitor Series:
4907-EN-01, R/D
 Subject Terms
Joint Capability Areas:
JCA_6.3.3_Spectrum Management; JCA_5_Command and Control; JCA_5.3_Planning; JCA_6_Net Centric; JCA_6.3_Net Management; JCA_1.2.7_Experimentation; JCA_6.1_Information Transport; JCA_8.2.3_Build the Capabilities and Capacities of Partners and Institutions; JCA_8.2_Shape; JCA_8_Building Partnerships; JCA_1.2_Force Preparation; JCA_1_Force Support
Modernization Areas:
Microelectronics
Communities of Interest:
Sensors
Descriptor(s):
*WATER WAVES, *BREAKWATERS, TRANSFER FUNCTIONS, DETECTORS, LOADS(FORCES), STIFFNESS, THEORY, FIELD TESTS, NUMERICAL ANALYSIS, STATISTICS, MOTION, PRESSURE MEASUREMENT, REDUCTION, SPECTRA, NONLINEAR SYSTEMS, MATHEMATICAL PREDICTION, WAVE PROPAGATION, MODEL TESTS, LINEARITY, RANGE(EXTREMES), ELEVATION, COASTAL ENGINEERING, NORWAY, AMPLITUDE, HYDRODYNAMICS, DYNAMIC PRESSURE, PONTOONS, FLOATING BODIES, MOORING, ANCHOR CHAINS, CONTROL, MEASUREMENT
Field(s)/Group(s):
Physical and Dynamic Oceanography, Civil Engineering, Test Facilities, Equipment and Methods, Fluid Mechanics
Keyword(s):
FENDERED BREAKWATERS, FLOATING BREAKWATERS, COASTAL ENGINEERING WATER WAVES NORWAY, FOREIGN REPORTS
Report Date:
1989 Jun 01