The paper presents the results from model scale experiments on the study of forces in the moorings of horizontally interlaced, multi-layered, moored floating pipe breakwaters. The studies are conducted with breakwater models having three layers subjected to waves of steepness
Hi/
L (
Hi is the incident wave height and
L the wavelength) varying from 0.0066 to 0.0464, relative width
W/
L (
W is the width of breakwater) varying from 0.4 to 2.65, and relative spacing
S/
D (
S is the spacing of pipes and
D the diameter of pipe) of 2 and 4. The variation of measured normalized mooring forces on the seaward side and leeward side are analyzed by plotting non-dimensional graphs depicting
f/
γW2 (
f is the force in the mooring per unit length of the breakwater,
γ the weight density of sea water) as a function
W/
L for various values of
Hi/
d (
d is the depth of water). It is found that the force in the seaward side mooring increases with an increase in
Hi/
L for
d/
W values ranging between 0.081 and 0.276. The experimental results also reveal that the forces in the seaward side mooring decrease as
W/
L increases, up to a value of
W/
L=1.3, and then increases with an increase in
W/
L. It is also observed that the wave attenuation characteristics of breakwater model with relative spacing of 4 is better than that of the model with relative spacing of 2. The maximum force in the seaward side mooring for model with
S/
D=4 is lower compared to that for the breakwater model with
S/
D=2. A multivariate non-linear regression analysis has been carried out for the data on mooring forces for the seaside and leeside.
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