Overcoming challenges for implementing nature-based solutions in deltaic environments: insights from the Ganges-Brahmaputra delta in Bangladesh

Animesh K Gain, Mohammed Mofizur Rahman, Md Shibly Sadik, Mohammed Sarfaraz Gani Adnan, Sate Ahmad, Shaiikh Muhammad Mehedi Ahsan, Md Ashik-Ur-Rahman, Thorsten Balke, Dilip K Datta, Camelia Dewan, Nazmul Huq, M Shah Alam Khan, Andy Large, Bishawjit Mallick, M Mohibbullah, M Shahjahan Mondal, Siddharth Narayan, Golam Rabbani, Rezaur Rahman, Fabrice G Renaud, Kimberly G Rogers and Jantsje M van Loon-Steensma

Published in ‘Environmental Research Letters’

Abstract

The Ganges-Brahmaputra (GB) delta is one of the most disaster-prone areas in the world due to a combination of high population density and exposure to tropical cyclones, floods, salinity intrusion and other hazards. Due to the complexity of natural deltaic processes and human influence on these processes, structural solutions like embankments are inadequate on their own for effective hazard mitigation. This article examines nature-based solutions (NbSs) as a complementary or alternative approach to managing hazards in the GB delta. We investigate the potential of NbS as a complementary and sustainable method for mitigating the impacts of coastal disaster risks, mainly cyclones and flooding. Using the emerging framework of NbS principles, we evaluate three existing approaches: tidal river management, mangrove afforestation, and oyster reef cultivation, all of which are actively being used to help reduce the impacts of coastal hazards. We also identify major challenges (socioeconomic, biophysical, governance and policy) that need to be overcome to allow broader application of the existing approaches by incorporating the NbS principles. In addition to addressing GB delta-specific challenges, our findings provide more widely applicable insights into the challenges of implementing NbS in deltaic environments globally.