The interaction of oblique surface gravity waves with multiple bottom-standing flexible porous breakwaters is analyzed based on the linearized theory of water waves. Using the method of eigenfunction expansion and the least square approximation, the wave propagation in the presence of single bottom-standing barriers is analyzed considering the upper edge to be: (i) free and (ii) moored, whereas the lower edge is considered to be clamped at the bottom. The wide-spacing approximation is used to analyze the wave interaction with multiple porous bottom-standing flexible barriers to understand the effect of the submerged flexible barriers as an effective breakwater. A brief comparison of both the upper edge conditions is carried out to analyze the effect of wave dissipation due to the presence of multiple barriers. The numerical results for the reflection and transmission coefficients along with the free surface vertical deflection are obtained for the case of two and three multiple bottom-standing barriers. The attenuation in the wave height due to the presence of porosity, change in barrier depth, and distance between the barriers are analyzed. The present study will be helpful in the analysis of proper functioning of porous bottom-standing barrier as an effective breakwater for the protection of offshore structures.
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February 2015
Research-Article
Propagation of Gravity Waves Past Multiple Bottom-Standing Barriers
D. Karmakar,
D. Karmakar
Centre for Marine Technology and Engineering,
Instituto Superior Técnico,
e-mail: debabrata.karmakar@centec.tecnico.ulisboa.pt
Instituto Superior Técnico,
Universidade de Lisboa
,Av. Rovisco Pais
,1049-001 Lisboa
, Portugal
e-mail: debabrata.karmakar@centec.tecnico.ulisboa.pt
Search for other works by this author on:
C. Guedes Soares
C. Guedes Soares
1
Fellow ASME
Centre for Marine Technology and Engineering,
Instituto Superior Técnico,
e-mail: c.guedes.soares@centec.tecnico.ulisboa.pt
Centre for Marine Technology and Engineering,
Instituto Superior Técnico,
Universidade de Lisboa
,Av. Rovisco Pais
,1049-001 Lisboa
, Portugal
e-mail: c.guedes.soares@centec.tecnico.ulisboa.pt
1Corresponding author.
Search for other works by this author on:
D. Karmakar
Centre for Marine Technology and Engineering,
Instituto Superior Técnico,
e-mail: debabrata.karmakar@centec.tecnico.ulisboa.pt
Instituto Superior Técnico,
Universidade de Lisboa
,Av. Rovisco Pais
,1049-001 Lisboa
, Portugal
e-mail: debabrata.karmakar@centec.tecnico.ulisboa.pt
C. Guedes Soares
Fellow ASME
Centre for Marine Technology and Engineering,
Instituto Superior Técnico,
e-mail: c.guedes.soares@centec.tecnico.ulisboa.pt
Centre for Marine Technology and Engineering,
Instituto Superior Técnico,
Universidade de Lisboa
,Av. Rovisco Pais
,1049-001 Lisboa
, Portugal
e-mail: c.guedes.soares@centec.tecnico.ulisboa.pt
1Corresponding author.
Contributed by the Ocean, Offshore, and Arctic Engineering Division of ASME for publication in the JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING. Manuscript received October 26, 2013; final manuscript received June 8, 2014; published online October 6, 2014. Assoc. Editor: Celso P. Pesce.
J. Offshore Mech. Arct. Eng. Feb 2015, 137(1): 011101 (10 pages)
Published Online: October 6, 2014
Article history
Received:
October 26, 2013
Revision Received:
June 8, 2014
Citation
Karmakar, D., and Guedes Soares, C. (October 6, 2014). "Propagation of Gravity Waves Past Multiple Bottom-Standing Barriers." ASME. J. Offshore Mech. Arct. Eng. February 2015; 137(1): 011101. https://doi.org/10.1115/1.4027896
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