Demonstration Bioengineered Revetment in Bac Kan, Vietnam ADB TA - - PowerPoint PPT Presentation

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Demonstration Bioengineered Revetment in Bac Kan, Vietnam ADB TA - - PowerPoint PPT Presentation

Feb 28, 2023 43 likes •287 views

Using Vetiver Grass in Thanh Mai Demonstration Bioengineered Revetment in Bac Kan, Vietnam ADB TA 8102-VIE: Promoting Climate Resilient Rural Infrastructure in Northern Vietnam James Ramsay - Nguyen Dinh Ninh OVERVIEW PROJECT NAME

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Using Vetiver Grass in Thanh Mai Demonstration Bioengineered Revetment in Bac Kan, Vietnam

ADB TA 8102-VIE: Promoting Climate Resilient Rural Infrastructure in Northern Vietnam

James Ramsay - Nguyen Dinh Ninh

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OVERVIEW

PROJECT NAME Promoting Climate Resilient Rural Infrastructure in Northern Vietnam FUNDED BY Global Environment Facility (GEF) through Asian Development Bank (ADB) and United Nations Development Programme (UNDP) DEMONSTRATION MODEL Bioengineered revetment in Thanh Mai commune, Bac Kan

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SITE SELECTION

Thanh Mai commune, Cho Moi district, Bac Kan province A tributary of Cau river SRIDP protects 2.42 km of riverbank on the Thanh Mai river in Thanh Mai and Cao Ky 2 possible sites for demonstration bioengineering measures: in Thanh Mai and Cao Ky Thanh Mai site was chosen for: (i) erosion that is threatening community infrastructure (roads, power lines), (ii) suitability for demonstration measures

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LOCATION OF DEMONSTRATION SITE

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SECTION SELECTED FOR BIOENGINEERING MEASURES

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TECHNICAL MEASURES

6 vegetative treatments 1 toe protection treatment Demonstration of bioengineering measures on 106 m

  • f Thanh Mai

riverbank

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BIOENGINEERING MEASURES APPLIED

Segment Length (m) TECHNIQUE Toe protection Bank protection

1 25

Vegetated riprap Brush layers

2 25

Vegetated riprap Live poles

3 25

Riprap Live fences Fascines

4 31

Vegetated riprap Vetiver grass lines

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SPECIES AND TECHNIQUES USED

Bioengineering Technique Species Name Local Name English Name

Brush layers Homonoia riparia Pượu Willow-leaved water croton Live fences Homonoia riparia Pượu Willow-leaved water croton Ficus benjamina Si Benjamin’s fig, Weeping fig Live poles Ficus benjamina Si Benjamin’s fig, Weeping fig Fascines Ficus benjamina Si Benjamin’s fig, Weeping fig Vegetated riprap Ficus benjamina Si Benjamin’s fig, Weeping fig Grass Chrysopogon zizanioides Vetiver Vetiver

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Ficus Benjamina (Si)

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Homonoia riparia (Puou)

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Vetiver Grass

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CROSS-SECTION K0

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CROSS-SECTION K3

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CROSS-SECTION K6

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CROSS-SECTION K9

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Thanh Mai Revetment after Construction

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Vegetated riprap using ‘Si’ cuttings

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Brush layers using ‘Puou’ cuttings

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Planting vetiver

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Planting vetiver

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IRRIGATE VETIVER GRASS

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SUMMARY AND RESULTS TO DATE

  • Planting date: 12-14 April 2015
  • Latest observation date: 20 April 2015
  • General Observation and Results to Date of Techniques
  • Toe protection: survived flood during construction
  • Bank protection: too early to assess
  • Homonoia riparia - Brush layers
  • Homonoia riparia - Live fences
  • Ficus benjamina - Live fences
  • Ficus benjamina - Live poles
  • Ficus benjamina – Fascines
  • Ficus benjamina – Vegetated riprap
  • Chrysopogon zizanioides - Vetiver Grass rows
  • Effectiveness of Vetiver compared with Other Plants from Results to Date:

too early to assess

  • Recommendations: continue monitoring; bring visitors to raise awareness
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Benefits of bioengineering in general or with Vetiver grass

Environmentally friendly Short construction time (only 2 months) Uses local labour Cost-effective Low cost: 20-40% as much as conventional measures

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