Experimental investigating on the reflected waves from the caisson-type vertical porous seawalls

Mehdi Esmaeili; Maryam Rahbani; Ali Karami Khaniki

doi:10.1007/s13131-019-1386-6

Volume 38 Issue 6

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Mehdi Esmaeili, Maryam Rahbani, Ali Karami Khaniki. Experimental investigating on the reflected waves from the caisson-type vertical porous seawalls[J]. Acta Oceanologica Sinica, 2019, 38(6): 117-123. doi: 10.1007/s13131-019-1386-6

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Mehdi Esmaeili, Maryam Rahbani, Ali Karami Khaniki. Experimental investigating on the reflected waves from the caisson-type vertical porous seawalls[J]. Acta Oceanologica Sinica, 2019, 38(6): 117-123. doi: 10.1007/s13131-019-1386-6

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Experimental investigating on the reflected waves from the caisson-type vertical porous seawalls

doi: 10.1007/s13131-019-1386-6

1.
Marine Sciences Colleges, Chabahar Maritime University, Chabahar 99711, Iran
2.
Faculty of Marine Science and Technology, University of Hormozgan, Bandar Abbas 79131, Iran
3.
Soil Conservation and Watershed Management Research Institute, Tehran 1398, Iran

More Information

Corresponding author: E-mail: maryamrahbani@yahoo.com
Received Date: 2017-10-19
Accepted Date: 2018-02-09

Available Online: 2020-04-21

Publish Date: 2019-06-01

Abstract

Abstract

The hydrodynamic efficiencies of caisson-type vertical porous seawalls used for protecting coastal areas were calculated in this study. Physical models were developed to compare the wave reflection from vertical plane, semi-porous, and porous seawalls caused by both regular and random waves. Tests were carried out for a wide range of wave heights, wave periods, and different water depths (d=0.165, 0.270 and 0.375 m). The performance regarding the reflected waves from porous and semi-porous seawalls showed improvement when compared with those from the plane seawall. The reflection coefficients of the porous and semi-porous seawalls were calculated as 0.6 and 0.75, respectively, while the coefficient for the fully reflecting plane vertical wall was significantly higher (0.9). It was also observed that the reflection coefficient decreases with increase in wave steepness and relative water depth. In addition, the reduction in the reflection coefficient of porous and semi-porous seawalls, as compared to that of a plane seawall, was observed for both regular and random waves. New equations were also proposed to calculate the reflection coefficient of different types of seawalls with the aid of laboratory experiments. By verifying the developed equations using some other experimental data, it was validated that the equations could be used for practical situations. The results of the present study can be applied to optimize the design of vertical seawalls and for coastal protecting schemes.
- reflection coefficient,
- porous seawall,
- regular wave,
- random wave,
- flume

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References

Chen Hongbin, Tsai C P, Chiu J R. 2006. Wave reflection from vertical breakwater with porous structure. Ocean Engineering, 33(13): 1705–1717. doi: 10.1016/j.oceaneng.2005.10.014

Goda Y, Suzuki Y. 1976. Estimation of incident and reflected waves in random waves. In: Proceedings of 15th Conference on Coastal Engineering. New York: ASCE, 828–845

Koraim A S, Heikal E M, Abo Zaid A A. 2014. Hydrodynamic characteristics of porous seawall protected by submerged breakwater. Applied Ocean Research, 46: 1–14. doi: 10.1016/j.apor.2014.01.003

Koraim A S, Rageh O S. 2013. Hydrodynamic performance of vertical porous structures under regular waves. China Ocean Engineering, 27(4): 451–468. doi: 10.1007/s13344-013-0039-3

Lee J I, Shin S. 2014. Experimental study on the wave reflection of partially perforated wall caissons with single and double chambers. Ocean Engineering, 91: 1–10. doi: 10.1016/j.oceaneng.2014.08.008

Neelamani S, Sandhya N. 2003. Wave reflection characteristics of plane, dentated and serrated seawalls. Ocean Engineering, 30(12): 1507–1533. doi: 10.1016/S0029-8018(02)00139-7

Negm A, Nassar K. 2016. Determination of wave reflection formulae for vertical and sloped seawalls via experimental modelling. Procedia Engineering, 154: 919–927. doi: 10.1016/j.proeng.2016.07.502

Suh K D, Choi J C, Kim B H, et al. 2001. Reflection of irregular waves from perforated-wall caisson breakwaters. Coastal Engineering, 44(2): 141–151. doi: 10.1016/S0378-3839(01)00028-X

Sassa S, Takahashi H, Morikawa Y, et al. 2016. Effect of overflow and seepage coupling on tsunami-induced instability of caisson breakwaters. Coastal Engineering, 117: 157–165. doi: 10.1016/j.coastaleng.2016.08.004

Theocharis I, Anastasaki E N, Moutzouris C I, et al. 2011. A new wave absorbing quay-wall for wave height reduction in a harbor basin. Ocean Engineering, 38(17–18): 1967–1978. doi: 10.1016/j.oceaneng.2011.09.020

Yan Shuwang, Zhang Jingjing, Chu Jian, et al. 2017. Analytical and experimental studies on installation of a suction caisson with tampered tip in clay. Marine Georesources & Geotechnology, 35(3): 435–440

Young D M, Testik F Y. 2011. Wave reflection by submerged vertical and semicircular breakwaters. Ocean Engineering, 38(10): 1269–1276. doi: 10.1016/j.oceaneng.2011.05.003

Zanuttigh B, van der Meer J W. 2008. Wave reflection from coastal structures in design conditions. Coastal Engineering, 55(10): 771–779. doi: 10.1016/j.coastaleng.2008.02.009

Zhu Shutang. 1999. Interaction between waves and porous seawalls [dissertation]. Hong Kong: University of Hong Kong, 137

Zhu Shutang, Chwang A T. 2001. Investigations on the reflection behaviour of a slotted seawall. Coastal Engineering, 43(2): 93–104. doi: 10.1016/S0378-3839(01)00008-4

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