Study on the reflection, transmission and wave energy dissipation characteristics of perforated hollow pile breakwaters

To protect the mangrove forests along the coastal areas of Mekong Delta, the research group on coastal and river bank protection of Hydraulic Construction Institute has created perforated hollow pile breakwaters to reduce wave energy. Perforated hollow pile breakwaters (PHPB) were made by vertical perforated piles, they were installed in the ground and stabilized by the inner stones. This paper presents the results of study on reflection, wave energy dissipation and transmission characteristics of PHPB on physical model. The results show that the ratio of d/H varied from 0.7 to 0.93, the transmission coefficient (Kt) increased from 0.45 to 0.6 and the reflection coefficient (Kr) decreased from 0.55 to 0.47. At the d/H was 0.75, wave energy dissipation was maximum as 70% and Kt approximated 0.5 with Kr from 0.5 to 0.52. Thus, the authors suggested that the top elevation of structures should be chosen as 1.33 times of design sea water level when applying these structures for coastal protection projects.

1. INTRODUCTION

2. EXPERIMENTAL INVESTIGATIONS

2.1. Experiment design

2.2. Method

3. EXPERIMENTAL RESULTS AND DISCUSSION

3.1. Experimental results

3.2. Discussion

4. CONCLUSIONS

REFERENCES

Mansard, E. P. D., and Funke, E. R. (1980). The Measurement of Incident and Reflected Spectra Using a Least Square Method. Proc. 17th Coastal Eng. Conf., Sydney, Australia, vol. 1, pp. 154-172.

K. Sankarbabu, S.A. Sannasiraj, V. Sundar (2008). Hydrodynamic performance of a dual cylindrical caisson breakwater. Coastal Engineering 55 (2008) 431–446.

Norzana Mohd Anuar and Faridah Jaffar Sidek (2010). Wave characteristics around perforated piles in a two rows arrangement. Malaysian Journal of Civil Engineering 24(1):48-66 (2010).

Sonia y. El.serafy, Yasser E. Mostafa, Yasser M. EL Saie and Christena F. Gad (2016). Reducing Wave Energy by Using of Perforated Piles Breakwaters. IOSR Journal of Mechanical and Civil Engineering (IOSR-JMCE) e-ISSN: 2278-1684,p-ISSN: 2320-334X, Volume 13, Issue 6 Ver. VII (Nov. - Dec. 2016), PP 01-09.

See detail: Study on the reflection, transmission and wave energy dissipation characteristics of perforated hollow pile breakwaters

Thai Van. TRAN1, Hung Duc. PHAM2, Ha Hai. NGUYEN 3 and Tam Thanh. NGUYEN4

1 Hydraulic Construction Institute, 03/95 Alley, Chua Boc Street, Dongda District, Hanoi City, VIETNAM
2 Hydraulic Construction Institute, 03/95 Alley, Chua Boc Street, Dongda District, Hanoi City, VIETNAM. Email: pduchungvtc@gmail.com
3,4 Hydraulic Construction Institute, 03/95 Alley, Chua Boc Street, Dongda District, Hanoi City, VIETNAM

Proceedings of the 10th International Conference on Asian and Pacific Coasts
(APAC 2019) Hanoi, Vietnam, September 25-28, 2019