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Bamboo breakwaters
Site-specific erosion protection and adaptation to climate change
in Soc Trang Province, Vietnam
Dr. Klaus Schmitt, Dr. Thorsten Albers & Arndt von Lieberman
Presented by Phạm Thùy Dương
4th International Conference on Estuaries and Coasts
8 - 11 October 2012, Hanoi, Vietnam

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Outline
1. Introduction
2. Methodology
3. Construction
4. Monitoring
5. Conclusions
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 Narrow belt of mangrove forest along the coast line
 Dynamic coast line (process of accretion and erosion up to 30 m/yr)

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In some sites the dyke is threatened by erosion.
Can we rehabilitate mangroves in such sites to protect the
coast from erosion and storms?
1. Introduction
1. Introduction

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Mangroves grow along sheltered
coastline.
Rehabilitating mangroves only possible
after the wave energy has been reduced
by physical barriers.
 Breakwaters: reduce erosion &
stimulate sedimentation.
Mangrove rehabilitation in erosion sites
51. Introduction
1. Introduction
Appropriate designs based on numerical modelling
(which simulates hydrodynamics and shoreline
development) to minimise downdrift erosion.

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2. Methodology
 Numerical modelling using open
source software (SWAN,
RMA·Kalypso, GENESIS)*
 Use existing data
 Field measurements
 Physical modelling
(*see www.czm-soctrang.org.vn)
62. Methodology

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Physical modelling of wave transmission with the bamboo fence
72. Methodology

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3. Construction
 Local labour
 Bamboo poles
 Brushwood bundles
 Rattan, jute, stainless steel
wire for connections
83. Construction – Materials & labours

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93. Construction – Installation of one bamboo T-fence, June 2012

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3. Construction
103. Construction – Site map
T-shaped bamboo fences in Nopol

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4. Monitoring
 Visual control
 Photo documentation
 Benchmarks
 GPS shoreline survey
 Mangrove monitoring
 Mud density analysis
 Wave measurements
114. Monitoring

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Wave transmission coefficients
derived from physical modelling and field measurements
124. Monitoring

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5. Conclusions
155. Conclusions
 Coastal protection and climate change adaptation
measures must be site-specific and appropriate:
 based on a sound understanding of natural processes
 numerical modelling as part of an integrated approach
to coastal area management (ICAM)
 testing of innovative approaches
(not one solution fits all)
 bamboo breakwaters and t-fences are an effective
way of coastal protection, create conditions for
mangrove rehabilitation in erosion sites.

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5. Conclusions
155. Conclusions
1,800 m completed
2,850 m under construction
1,500 m planned
 Total of 6,150 m
Current state of construction

16. Thank you for your attention!