Nature Meets Infrastructure: The Role of Mangroves in Strengthening Bangladesh’s Coastal Flood Defenses

Alejandra Gijón Mancheño (), Bramka A. Jafino, Bas Hofland, Bregje K. van Wesenbeeck, Swarna Kazi and Ignacio Urrutia
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Alejandra Gijón Mancheño: Department of Hydraulic Engineering, Faculty of Civil Engineering and Geosciences, Delft University of Technology, Stevinweg 1, 2628 CN Delft, The Netherlands
Bramka A. Jafino: World Bank, 1818 H Street, Washington, DC 20433, USA
Bas Hofland: Department of Hydraulic Engineering, Faculty of Civil Engineering and Geosciences, Delft University of Technology, Stevinweg 1, 2628 CN Delft, The Netherlands
Bregje K. van Wesenbeeck: Department of Hydraulic Engineering, Faculty of Civil Engineering and Geosciences, Delft University of Technology, Stevinweg 1, 2628 CN Delft, The Netherlands
Swarna Kazi: World Bank, 1818 H Street, Washington, DC 20433, USA
Ignacio Urrutia: World Bank, 1818 H Street, Washington, DC 20433, USA

Sustainability, 2025, vol. 17, issue 4, 1-14

Abstract: Mangroves have been used for coastal protection in Bangladesh since the 1960s, but their integration with embankment designs has not been fully explored. This paper investigates the effect of existing mangroves on required embankment performance, with a focus on the wave-damping effect of mangroves. Existing mangroves reduce the required thickness of embankment revetment by up to 16–30% in the west, 47–82% in the central region, and 53–77% in the east. Notable mangrove sites include the belt south of polder 45 (Amtali), with an average width of 1.77 km, and the Kukri-Mukri polder, with an average width of 1.82 km. These mangroves reduce the need for thick slope protection, allowing the replacement of concrete revetments with softer materials, such as clay or grass, combined with mangrove foreshore. Additional large mangrove belts are found in Sandwip and Mirersarai. By replacing or reducing revetment requirements, mangrove forests can minimize carbon emissions from construction while providing carbon sequestration and other ecosystem services. This study can inform future sustainable investments in coastal protection systems by identifying areas where mangroves offer the greatest wave-damping benefits, which could be focus of follow-up feasibility studies.

Keywords: mangroves; nature-based solutions; hybrid engineering; coastal embankments; coastal protection; sustainable investments (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2025
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