Shore Parallel Pile Row Breakwaters of Pelangi Beach Resort and Spa

8/12/2019 Shore Parallel Pile Row Breakwaters of Pelangi Beach Resort and Spa

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PROJECT BACKGROUND

SIGNIFICANCE OF THE PROJECT

PROJECT HIGHLIGHTS



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PROJECT BACKGROUND


PROJECT HIGHLIGHTS



PROJECT PROFILE

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Project Name Pelangi Beach Restoration

Owner of Project Pernas OUE (Langkawi) SDN. BHD

Designer/Project

Supervision

Delta Marine Consultants (DMC)

Project location Langkawi, Malaysia

Project coordinate 6 17’ N, 99 43’ E

Project Background



MALAYSIA MAP

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SITE MAP

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SITE



LOCAL BATHEMTRY

7Project Background

Erosion Rate: 1.5m /year Tidal current :0.6m/s



REASON FOR EROSION

• Decline in sediment supply to the spit by Sungai Chenang, dueto a reduction in forest clearing.

• During construction of the resort, it was decided to enlarge

the spit by reclamation, based on the architectural layout.Since the new layout was not a stable situation, in the localwave climate, the coastline of the resort rapidly.

8Project Background



FAILED MITIGATION METHOD

9Project Background



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PROJECT BACKGROUND


PROJECT HIGHLIGHTS

BIBLIOGRAPHY



SIGNIFICANCE OF PROJECT

The project needs to address the coastal erosion of the PelangiBeach Resort while taking into consideration the recreational useof the beach.

Due to its purpose it is required that a solution should have:

Minimum visual impact on the beach,

And would not endanger recreation along the beach.

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PROJECT BACKGROUND


PROJECT HIGHLIGHTS



PROPOSED ALTERNATIVES

Rubble Mound Break Water• Quite massive, hinder the view from the beach to the offshore islands.

• Would lead to rip currents near the breakwater heads which could be dangerousfor swimmers

• Scour holes develop in front of the breakwaters due to wave reflection

• Expensive

13Project Highlights



PROPOSED ALTERNATIVES


Parallel Pile Rows• Does not pose large visual impact

• Allow sediment transport

• Local scour around the piles occurs

• Less expensive



DESIGN


• Formation of salients (Hanson and Kraus)• Transmission Coefficient of 0.6 at high tide (Hayashi, Grune and Kohlhase)• The concrete spun pile row breakwaters consist of individual 350 mm

diameter round piles with gaps of 70 mm in between• Design scouring depth : 0.5m (Hayashi and Shirai)

350mm

0.5m(Scouring Depth)

Pile row at low water level



DESIGN

• The initial height of the piles above the seabed is 1.5 m for the northern pile row and2.2 m for the southern pile row.

• The pile rows were placed 75 m offshore from the High Water line. The northern pilerow has a length of 120 m and the southern 140 m. The distance between both pilerows is 210 m.

• A beach replenishment of 15,000 m 3 was foreseen at the beach behind the two pilerows, using 400 m D50 sand.


Overview of the beach resort with pile rows.



PERFORMANCE

• ln general the pile rows performed excellent. The salient sandbodies on the lee side of the pile rows almost developed intoshore connecting tombolos .


Southern pile row at low tideSituation before and afterconstruction of pile rows



REFERENCES

• Ir. J.S. REEDIJK, Shore parallel pile row breakwaters, an example of an effective coastal protection scheme, Breakwaters, CoastalStructures and Coastlines: Proceedings of the International Conference Organized by the Institution of Civil Engineers and Held in

London, UK on 26-28 September 2001

• Silvester R., Coastal Engineering, Elsevier, 1974

• Hanson H, and Kraus N.C., Shoreline response to a single transmissive detached breakwater, Coastal Engineering (154), 1990

• Hayashi R.M. et al, Hydraulic research on Close Spaced Pile Breakwaters, Proc. Coastal Engineering Conference, 1966

• Grune J.,and Kohlhase S., wave transmission through vertical slotted walls, Proc. 14th

• Coastal Engineering Conference, ASCE, 1974

• Anon., Shore Protection Manual, CERC, 1984

• Hayashi R.M. and Shirai M., Closely spaced pile breakwater as a protection structure against beach erosion, Coastal Engineering inJapan Vol II, 1968

• Anon, British Standard 6349 part 1 maritime Structures , British Standards Institution, 2000

• Bakker W.T. et al, Permeable Groynes, experiment and practice in the Netherlands, Proc. 19th International Conference on Coastalengineering, ASCE, 1984

• https://www.google.com.ph/maps

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Shore Parallel Pile Row Breakwaters of Pelangi Beach Resort and Spa