bamboo breakwater icec_2012
TRANSCRIPT
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Bamboo breakwatersSite-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
1
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2
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Narrow belt of mangrove forest along the coast line
Discharge regime Mekong
Long
-sho
re c
urre
nts
Tidal regime
up to 4 m
Dynamic coast line (process of accretion and erosion up to 30 m/yr)
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4
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
5 1. 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)
6 2. Methodology
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Physical modelling of wave transmission with the bamboo fence 7 2. Methodology
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3. Construction
Local labour
Bamboo poles
Brushwood bundles
Rattan, jute, stainless steel wire for connections
8 3. Construction – Materials & labours
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9 3. Construction – Installation of one bamboo T-fence, June 2012
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3. Construction
10 3. Construction – Site mapT-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
11 4. Monitoring
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Wave transmission coefficients derived from physical modelling and field measurements
12 4. Monitoring
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5. Conclusions
15 5. 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
15 5. Conclusions
1,800 m completed
2,850 m under construction
1,500 m planned
Total of 6,150 m
Current state of construction
Thank you for your attention!