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The Diffraction of Multidirectional Random Waves by Rectangular Submarine Pits

[+] Author and Article Information
Hong Sik Lee

Department of Civil Engineering, Chung-Ang University, Anseong, Gyeonggi-Do, 456-756, South Korea

A. Neil Williams

Department of Civil and Environmental Engineering, University of Houston, Houston, TX, 77204-4791, USA

J. Offshore Mech. Arct. Eng 126(1), 9-15 (Mar 02, 2004) (7 pages) doi:10.1115/1.1641387 History: Received August 01, 2002; Revised May 01, 2003; Online March 02, 2004
Copyright © 2004 by ASME
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References

Figures

Grahic Jump Location
Definition sketch for multiple-pit configuration
Grahic Jump Location
Contour maps of diffraction coefficients for a single pit with b/a=1.0(a=6 m,b=6 m), k1d=π/10,k2h=π/10√2,h/d=0.5(h=1.5 m,d=3.0 m), θ=θR=0°,a/d=2.0,T=T1/3=11 s,L=L1/3=42.46 m, for (a) regular waves, (b) random waves with Smax=10
Grahic Jump Location
Contour maps of diffraction coefficients for a single pit with b/a=0.1(a=1000 m,b=100 m), h/d=0.5(h=6 m,d=12 m), kh=0.269,θ=θR=0°,T=T1/3=18 s,L=L1/3=140.15 m, for (a) regular waves, (b) random waves with Smax=10
Grahic Jump Location
Contour maps of diffraction coefficients for a dual pit configuration with bj/aj=2.0(aj=19 m,bj=38 m;j=1, 2), d/h=3.0(d=3 m,h=1 m), kh=0.167,θ=θR=0°,T=T1/3=12 s,L=L1/3=37.5 m, for (a) regular waves, (b) random waves with Smax=10. The edge-to-edge pit spacing is 38 m
Grahic Jump Location
Contour maps of diffraction coefficients for a triple pit configuration with bj/aj=2.0(aj=19 m,bj=38 m;j=1,2,3),d/h=3.0(d=3 m,h=1 m), kh=0.167,θ=θR=0°,T=T1/3=12 s,L=L1/3=37.5 m, for (a) regular waves, (b) random waves with Smax=10. The edge-to-edge pit spacing is 38 m
Grahic Jump Location
Contour maps of diffraction coefficients for a dual pit configuration with b1/a1=4.0(a1=38 m,b1=152 m), b2/a2=0.1(a2=1000 m,b2=100 m), h/d=0.5(h=6 m,d=12 m), kh=0.269,θ=θR=0°,T=T1/3=18 s,L=L1/3=140.15 m, for (a) regular waves, (b) random waves with Smax=10. The edge-to-edge pit spacing is 462 m
Grahic Jump Location
Contour map of diffraction coefficient for a single pit with b/a=0.1(a=1000 m,b=100 m), h/d=0.5(h=6 m,d=12 m), kh=0.269,θR=0°,T1/3=18 s,L1/3=140.15 m for random waves with Smax=75
Grahic Jump Location
Contour map of diffraction coefficient for a dual pit configuration with bj/aj=2.0(aj=19 m,bj=38 m;j=1,2),d/h=3.0(d=3 m,h=1 m), kh=0.167,θR=0°,T1/3=12 s,L1/3=37.5 m for random waves with Smax=75. The edge-to-edge pit spacing is 38 m
Grahic Jump Location
Contour map of diffraction coefficient for a triple pit configuration with bj/aj=2.0(aj=19 m,bj=38 m;j=1,2,3),d/h=3.0(d=3 m,h=1 m), kh=0.167,θR=0°,T1/3=12 s,L1/3=37.5 m for random waves with Smax=75. The edge-to-edge pit spacing is 38 m
Grahic Jump Location
Contour map and diffraction coefficient for a dual pit configuration with b1/a1=4.0(a1=38 m,b1=152 m), b2/a2=0.1(a2=1000 m,b2=100 m), h/d=0.5(h=6 m,d=12 m), kh=0.269,θR=0°,T1/3=18 s,L1/3=140.15 m for random waves with Smax=75. The edge-to-edge pit spacing is 462 m
Grahic Jump Location
Contour maps of diffraction coefficients for the same pit configurations as Figs. 78910 (or Figs. 3456), but with Smax=25
Grahic Jump Location
Variation of maximum and minimum diffraction coefficient with (a) dimensionless pit width, b/L=b/L1/3, for a/L=a/L1/3=0.5,d/h=3.0kh=0.167,θ=θR=0°; (b) dimensionless pit length, a/L=a/L1/3, for b/L=b/L1/3=1.0,d/h=3.0,kh=0.167,θ=θR=0°; (c) dimensionless pit depth, d/h, for a/L=a/L1/3=0.5,b/L=b/L1/3=1.0,kh=0.167,θ=θR=0°; and (d) angle of incidence θ=θR for a/L=a/L1/3=0.5,b/L=b/L1/3=1.0,d/h=3.0,kh=0.167. Notations: minimum diffraction coefficient for regular waves (▪▪▪); (•••) random waves with Smax=10, (▴▴▴) random waves with Smax=75; maximum diffraction coefficient-same symbols as minimum but without fill

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