Abstract

Submerged breakwaters formed by natural rocks dissipate the incident wave energy. Continuous quarrying of rocks has resulted in its depletion, leading researchers to look for alternate materials for the formation of such barriers. Thus, the concept of artificial reef units has evolved which has been gaining importance owing to the flexibility in molding to any desired shapes and sizes, workability and also due to the fact that it creates a habitable environment to marine flora and fauna. From the hydrodynamic performance perspective, artificial reef units are proven to be more efficient in reducing wave transmission on the lee side (e.g., Southern Caribbean shore of Dominican Republic and Vaan Island, Tuticorin, India). A comprehensive experimental investigation to examine the effect of trench width on hydrodynamic characteristics of the submerged reef system was carried out. The trench width was varied by incorporating single, double, and multiple perforated submerged trapezoidal artificial reef units. The focus of the present study is mainly on the influence of the number of reef units, relative crest width, and relative trench width of the submerged reef system on its transmission and reflection characteristics. The relative trench width was found to be an influential factor on wave transmission past the structure, and the least wave transmission was achieved for the reef configuration with eight units. The details of the experimental investigation, results and discussion are reported in this paper.

References

References
1.
Prasetya
,
G.
,
2007
,”
Coastal Protection in the Aftermath of the Indian Ocean Tsunami Proceedings of the Regional Technical Workshop
,
Khao Lak, Thailand
,
Aug. 28–31
, pp.
103
132
.
2.
Benassai
,
G.
,
2006
,
Introduction of Coastal Dynamics and Shoreline Protection
,
WIT Press
,
Southampton
.
3.
Pilarczyk
,
K. W.
,
2003
, “
Design of Low-Crested (Submerged) Structures: An Overview
,”
6th COPEDEC (International Conference on Coastal and Port Engineering in Developing Countries)
,
Sri Lanka
,
Sept. 15–19
, pp.
1
19
.
4.
Bleck
,
M.
,
2006
, “
Wave Attenuation by Artificial Reefs
,”
Technical Report No. TLJ400236
,
PIANC Magazine
,
Brussels, Belgium
.
5.
Harris
,
L. E.
,
2009
, “
Artificial Reefs for Ecosystem Restoration and Coastal Erosion Protection with Aquaculture and Recreational Amenities
,”
Reef J.
,
1
(
1
), pp.
235
246
.
6.
Dattari
,
J.
,
Raman
,
H.
, and
Shankar
,
N. J.
,
1979
, “
Performance Characteristics of Submerged Breakwaters
,”
16th International Conference on Coastal Engineering
,
Hamburg, Germany
,
Aug. 27–Sept. 3
, pp.
2152
2171
.
7.
Aono
,
T.
, and
Cruz
,
E. C.
,
1996
, “
Fundamental Characteristics of Wave Transformation Around Artificial Reefs
,”
Proceedings of 25th International Conference on Coastal Engineering
,
Orlando, FL
,
Sept. 2–6
, pp.
2298
2311
.
8.
Seabrook
,
S.
, and
Hall
,
K.
,
1998
, “
Wave Transmission at Submerged Rubblemound Breakwaters
,”
Proceedings of 26th International Conference on Coastal Engineering
,
Copenhagen, Denmark
, June 22–26, pp.
2000
2013
.
9.
Patterson
,
E. J. K.
,
Sannasiraj
,
S. A.
,
Malleshappa
,
H.
,
Sundar
,
V.
, and
Deepak
,
S. B.
,
2016
, “
Integrated Approach to Protect and Restore Sinking Vaan Island in Gulf of Mannar, India
,”
3rd International Conference on Coastal Zone Engineering and Management in Middle East
,
Dubai
,
Nov. 22
, pp.
81
83
.
10.
Tanaka
,
N.
,
1976
, “
Effects of Submerged Rubble Mound Breakwater on Wave Attenuation and Shoreline Stabilization, (in Japanese)
,”
Proceedings of 23rd Japanese Conference on Coastal Engineering
,
Tokyo, Japan
,
Nov. 5
, pp.
152
157
.
11.
Uda
,
T.
,
1998
, “
Function and Design Methods of Artificial Reef
,”
Coastal Zone ’93. Proceedings of the 8th Symposium on Coastal and Ocean Management
,
New Orleans, LA
,
July 19–23
,
American Society of Civil Engineers
,
New York
.
12.
Yoshioka
,
K.
,
Kawakami
,
T.
,
Tanaka
,
S.
,
Koarai
,
M.
, and
Uda
,
T.
,
1993
, “
Design Manual for Artificial Reefs
,”
Proceedings of Coastlines of Japan-II, Coastal Zone’93
,
New Orleans, LA
,
July 19–23
, p.
340
.
13.
Hieu
,
P. D.
,
2008
, “
Study of Wave Prevention Efficiency of Submerged Breakwater Using an Advanced Mathematical Model
,”
VNV J. Sci., Earth Sci.
,
24
(
3
), pp.
118
124
.
14.
Ohnaka
,
S.
, and
Yoshizwa
,
T.
,
1994
, “
Field Observation on Wave Dissipation and Reflection by an Artificial Reef With Varying Crown Width
,”
Proceedings of Hydro-Port’94
,
Yokosuka, Japan
,
Oct. 19–21
, pp.
365
376
.
15.
Smith
,
G. M.
,
2002
, “
AmWaj Island Development, Bahrain; Physical Modelling of Submerged Breakwaters
,”
Delft Hydraulics
,
Netherlands
,
Technical Report H4087
.
16.
Hirose
,
N.
,
Watanuki
,
A.
, and
Saito
,
M.
,
2002
, “
New Type Units for Artificial Reef Development of Eco-Friendly Artificial Reefs and the Effectiveness Thereof
,”
30
th
PIANC-AIPCN Congress
,
Sydney, N. S. W. Institution of Engineers
, pp.
886
899
.
17.
Dhinakaran
,
G.
,
Sundar
,
V.
,
Sundaravadivelu
,
R.
, and
Graw
,
K. U.
,
2011
, “
Performance of Perforated Submerged Semicircular Breakwaters due to Non-Breaking Waves
,”
J. Eng. Maritime Environ., Proc. IMechE, Part M
,
226
(
1
), pp.
36
50
. 10.1177/1475090211424002
18.
Herbich
,
J. B.
,
1990
, “Offshore (Detached) Breakwaters,”
Handbook of Coastal Engineering
, McGraw-Hill Education, New York, pp.
5.1
5.95
,
Chap. 5
.
19.
Yoshida
,
A.
,
Yan
,
S.
,
Yamashiro
,
M.
, and
Irie
,
I.
,
2002
, “
Experimental Study on Wave Field Behind a Double-Submerged Breakwater
,”
Proceedings of the 28th International Conference on Coastal Engineering 2002: Solving Coastal Conundrums, ICCE 2002
,
ASCE
, pp.
1913
1922
.
20.
Liu
,
Y.
,
Li
,
H.
, and
Zhu
,
L.
,
2016
, “
Bragg Reflection of Water Waves by Multiple Submerged Semi-Circular Breakwaters
,”
J. Appl. Ocean Res.
,
56
, pp.
67
78
. 10.1016/j.apor.2016.01.008
21.
Ida
,
Y.
, and
Kashimoto
,
A.
,
2004
, “
Wave Transmission Characteristics Behind Double Low-Crest Artificial Reef
,”
Proc. Civil Eng. Ocean
,
20
, pp.
719
724
. 10.2208/prooe.20.719
22.
Shing
,
T. K. C.
,
2014
, “
Experimental Study on the Effect of Submerged Breakwater Configuration on Long Wave Run-up Reduction
,”
PhD thesis
,
Civil and Environmental Engineering, University of Hawaii
,
Manoa, HI
.
23.
Wu
,
Y.-T.
, and
Hsiao
,
S.-C.
,
2017
, “
Propagation of Solitary Waves Over Double Submerged Barriers
,”
Water
,
9
(
12
), p.
917
. 10.3390/w9120917
24.
Okuzono
,
H.
,
1998
, “Development of Armor Block to use for Submerged Breakwaters in Large Tidal Zones,”
Trans. Built Environ.
, Vol.
36
,
WIT Press
,
Southampton
, www.witpress.com.
25.
Armono
,
H.
, and
Hall
,
K.
,
2003
, “
Wave Transmission on Submerged Breakwaters Made of Hollow Hemispherical Shape Artificial Reefs
,”
31st Annual Conference of the Canadian Society for Civil Engineering
,
Moncton, NB
,
June 4–7
, vol.
1
, pp.
2208
2217
.
26.
Zhao
,
Y.
,
Liu
,
Y.
,
Li
,
H.
, and
Chang
,
A.
,
2017
, “
Oblique Wave Motion Over Multiple Submerged Porous Bars Near a Vertical Wall
,”
J. Ocean Univ. China
,
16
(
4
), pp.
568
574
. 10.1007/s11802-017-3333-5
27.
Hughes
,
S. A.
,
1993
,
Physical Models and Laboratory Techniques in Coastal Engineering
,
World Scientific
,
Singapore
.
28.
Goda
,
Y.
, and
Suzuki
,
Y.
,
1976
, “
Estimation of Incident and Reflected Waves in Random Wave Experiments
,”
Proceedings of 15th International Conference on Coastal Engineering
,
1
(
15
),
ASCE
,
New York
, pp.
828
845
.
29.
Le Méhauté
,
B.
,
1990
, “Similitude. in Ocean Engineering Science,”
Part B in the series The Sea
,
9
,
B
Le Méhauté
, ed.,
John Wiley and Sons
,
New York
, pp.
955
980
.
30.
Shih
,
R. S.
,
Weng
,
W. K.
, and
Chou
,
C. R.
,
2013
, “
Numerical Modeling of Wave Field Around Multiple Submerged Breakwaters
,”
Marine Sci.
,
3
(
3
), pp.
65
78
.
31.
Rahman
,
M. A.
, and
Aysha
,
A.
,
2014
, “
The Effect of Porosity of Submerged and Emerged Breakwater on Wave Transmission
,”
Int. J. Environ. Sci. Develop.
,
5
(
5
), pp.
473
478
. 10.7763/IJESD.2014.V5.530
32.
Jiang
,
Z.
,
Liang
,
Z.
,
Lui
,
Y.
,
Tang
,
Y.
, and
Huang
,
L.
,
2013
, “
Particle Image Velocimetry and Numerical Simulations of the Hydrodynamic Characteristics of an Artificial Reef
,”
Chinese J. Oceanology Limnology
,
31
(
5
), pp.
949
956
. 10.1007/s00343-013-2241-9
33.
Cho
,
Y. S.
,
Lee
,
J. I.
, and
Kim
,
Y. T.
,
2004
, “
Experimental Study of Strong Reflection of Regular Waves Over Submerged Breakwaters in Tandem
,”
Ocean Eng.
,
31
(
10
), pp.
1325
1335
. 10.1016/j.oceaneng.2003.07.009
34.
Kishi
,
H.
,
Tamuro
,
M.
,
Mizuuchi
,
K.
,
Yamakawa
,
K.
, and
Oyamatsu
,
Y.
,
2013
, “
Hydrological Characteristics on the Double Row Submerged Breakwater Under Construction in Niigata West Coast
,”
J. Japan Soc. Civil Eng., Ser. B2 (Coastal Engineering)
,
69
(
2
), pp.
I_1001
I_1005
. 10.2208/kaigan.69.I_1001
35.
Wolberg
,
J.
,
2006
,
Data Analysis Using the Method of Least Squares: Extracting the Most Information From Experiments
,
Springer
,
Berlin
.
36.
Friebel
,
H. C.
, and
Harris
,
L. E.
,
2004
, “
A new Wave Transmission Coefficient Model for Submerged Breakwaters
,”
29th International Conference on Coastal Engineering
,
Lisbon, Portugal
,
Sept. 19–24
, pp.
19
24
.
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