Vietnamese communities in the Mekong Delta are faced with the substantial impacts of rising sea levels and salinity intrusion. The construction of embankments and dykes has historically been the principal strategy of the Vietnamese government to mitigate the effects of salinity intrusion on agricultural production. A predicted sea-level rise of 30 cm by the year 2050 is expected to accelerate salinity intrusion. This study combines hydrologic, agronomic and behavioural assessments to identify effective adaptation strategies reliant on land-use change (soft options) and investments in water infrastructure (hard options). As these strategies are managed within different policy portfolios, the political discussion has polarized between choices of either soft or hard options. This paper argues that an ensemble of hard and soft policies is likely to provide the most effective results for people’s livelihoods in the Mekong Delta. The consequences of policy deliberations are likely to be felt beyond the Mekong Delta as levels of rice cultivation there also affect national and global food security.
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Grinsted, A., Moore, J. C. & Jevrejeva, S. Reconstructing sea level from paleo and projected temperatures 200 to 2100 AD. Clim. Dynam. 34, 461–472 (2010).
Church, J. A., Gregory, J. M., White, N. J., Platten, S. M. & Mitrovica, J. X. Understanding and projecting sea level change. Oceanography 24, 130–143 (2011).
IPCC Climate Change 2007: The Physical Science Basis (eds Solomon, S. et al.) (Cambridge Univ. Press, 2007).
Wassmann, R., Hien, N. X., Hoanh, C. T. & Tuong, T. P. Sea level rise affecting the Vietnamese Mekong Delta: Water elevation in the flood season and implications for the rice production. Climatic Change 66, 89–107 (2004).
Church, J. A., Monselesan, D., White, N., Zhang, X. & Platten, S. in High-Resolution Climate Projections for Vietnam: Technical Report (eds Katzfey, J., McGregor, J. & Ramasamy, S.) Ch. 8, 159–173 (CSIRO, 2014).
Carew-Reid, J. Rapid Assessment of the Extent and Impact of Sea Level Rise in Vietnam, Climate Change (ICEM–International Centre for Environmental Management, 2008).
Impacts of Changes in Salinity Intrusion. Assessment of Basin-Wide Development—Technical Note 8 (Mekong River Commission, 2010).
Dang, K. N., Vu, A. P., Tran, H. P. & Nguyen, H. T. Rice Production Response and Technological Measures to Adapt to Salinity Intrusion in the Coastal Mekong Delta (Can Tho University, 2012).
FAOSTAT (FAO, 2013); http://faostat3.fao.org
Hoang, H. N., Huynh, H. X. & Nguyen, T. H. Computing and Communication Technologies, Research, Innovation, and Vision for the Future (RIVF) 1–4 (IEEE, 2012).
Le Dang, H., Li, E., Bruwer, J. & Nuberg, I. Farmers’ perceptions of climate variability and barriers to adaptation: Lessons learned from an exploratory study in Vietnam. Mitig. Adapt. Strategies Glob. Change 1–18 (2013).
Planning Atlas of the Lower Mekong River Basin (Mekong River Commission, 2011).
Grumbine, R. E., Dore, J. & Xu, J. Mekong hydropower: Drivers of change and governance challenges. Front. Ecol. Environ. 10, 91–98 (2012).
ICEM Strategic Environmental Assessment of Hydropower on the Mekong Mainstream—Final Report (Mekong River Commission, 2010).
Hoanh, C. T. et al. Livelihood impacts of water policy changes: Evidence from a coastal area of the Mekong river delta. Water Policy 5, 475–488 (2003).
Joffre, O. M. & Schmitt, K. Community livelihood and patterns of natural resources uses in the shrimp-farm impacted Mekong Delta. Aquacult. Res. 41, 1855–1866 (2010).
Mekong Delta Plan: Long-term Vision and Strategy for a Safe, Prosperous and Sustainable Delta (Government of Vietnam, 2013).
JICA Helps the Coastal Mekong Delta Adapt to Climate Change (JICA, 2011); http://www.jica.go.jp/vietnam/office/information/press/pdf/press2011/2011104_02e.pdf
Xue, Z., Liu, J. P., DeMaster, D., Nguyen, L. V. & Ta, T. K. O. Late Holocene evolution of the Mekong Subaqueous Delta, Southern Vietnam. Mar. Geol. 269, 46–60 (2010).
The National Strategy on Climate Change in the Period of 2011–2020 (Government of Vietnam, 2011); http://chinhphu.vn/portal/page/portal/English/strategies/strategiesdetails%3FcategoryId%3D30%26articleId%3D10051283
Blackmore, D., Perry, C. & Stein, R. Modelled Observations on Development Scenarios in the Lower Mekong Basin 146 (World Bank, 2004).
Dung, N. V., Merz, B., Bárdossy, A., Thang, T. D. & Apel, H. Multi-objective automatic calibration of hydrodynamic models utilizing inundation maps and gauge data. Hydrol. Earth Syst. Sci. 15, 1339–1354 (2011).
Mekong Delta Water Resources Master Plan to Response to Climate Change and Sea Level Rise. Internal Report (in Vietnamese) (Southern Institute for Water Resources Planning, 2011).
Mekong Delta Water Resources Planning in the Period of 2012–2020 and a Vision to 2050 Under the Projected Climate Change and Sea Level Rise (in Vietnamese) (Government of Vietnam, 2012).
Thorne, C. et al. Review of Sediment Transport, Morphology, and Nutrient Balance. Report to the Mekong River Commission Secretariat prepared as part of the Xayaburi MRCS Prior Consultation Project Review Report (Nottingham University, 2011).
Kummu, M. & Varis, O. Sediment-related impacts due to upstream reservoir trapping, the Lower Mekong River. Geomorphology 85, 275–293 (2007).
Hein, H., Hein, B. & Pohlmann, T. Recent sediment dynamics in the region of Mekong water influence. Glob. Planet. Change 110, 183–194 (2010).
Ha, T. T. P., van Dijk, H., Bosma, R. & Sinh, L. X. Livelihood capabilities and pathways of shrimp farmers in the Mekong Delta, Vietnam. Aquacult. Econ. Manag. 17, 1–30 (2013).
Son, V., Phuong, N., Hai, T. & Yakupitiyage, A. Production and economic efficiencies of intensive black tiger prawn (Penaeus monodon) culture during different cropping seasons in the Mekong Delta, Vietnam. Aquacult. Int. 19, 555–566 (2011).
Joffre, O. M. & Bosma, R. H. Typology of shrimp farming in Bac Lieu Province, Mekong Delta, using multivariate statistics. Agricult. Ecosys. Environ. 132, 153–159 (2009).
Kim, N. Q., Toan, T. Q. & Thang, T. D. An Investigation on the Efficient Use of Water Related to the Upstream Development Scenarios to Prevent Drought and Salinity Intrusion in the Mekong Delta (Hanoi Water Resources University, 2010).
Mainuddin, M., Kirby, M. & Hoanh, C. Impact of climate change on rainfed rice and options for adaptation in the lower Mekong Basin. Nature Hazards 66, 905–938 (2013).
Hirabayashi, Y. et al. Global flood risk under climate change. Nature Clim. Change 3, 816–821 (2013).
The Resolution on Ensured National Food Security (in Vietnamese) (Government of Vietnam, 2009).
Bohensky, E., Smajgl, A. & Brewer, T. Patterns in household-level engagement with climate change in Indonesia. Nature Clim. Change 2, 348–351 (2013).
Huy, H. T. Rural to Urban Migration as a Household Decision: Experimental Evidences from the Mekong Delta, Vietnam (DEPOCEN Working Paper Series 2009/20, Development Policies Research Center, 2009).
Tacoli, C. & Mabala, R. Exploring mobility and migration in the context of rural–urban linkages: Why gender and generation matter. Environ. Urban. 22, 389–395 (2010).
Smajgl, A. & Ward, J. (eds) in The Water–Food–Energy Nexus in the Mekong Region. Assessing Development Strategies Considering Cross-Sectoral and Transboundary Impacts 215–234 (Springer, 2013).
Conway, D. & Mustelin, J. Strategies for improving adaptation practice in developing countries. Nature Clim. Change 4, 339–342 (2014).
Nhan, D. K., Phap, V. A., Phuc, T. H. & Trung, N. H. Rice Production Response and Technological Measures to Adapt to Salinity Intrusion in the Coastal Mekong Delta (Can Tho University, 2012).
Smajgl, A. et al. The Mekong Region Simulation (Mersim) Model - Design Document (CSIRO Climate Adaptation Flagship, 2013).
Smajgl, A., House, A. & Butler, J. Implications of ecological data constraints for integrated policy and livelihoods modelling: An example from East Kalimantan, Indonesia. Ecol. Model. 222, 888–896 (2011).
Smajgl, A. & Ward, J. A framework for bridging science and decision making. Futures 52, 52–58 (2013).
The author wish to thank M. Kirby and M. Mainuddin for their constructive comments. The authors are grateful for the funding received from the DFAT CSIRO Research for Development Alliance.
The authors declare no competing financial interests.
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Smajgl, A., Toan, T., Nhan, D. et al. Responding to rising sea levels in the Mekong Delta. Nature Clim Change 5, 167–174 (2015) doi:10.1038/nclimate2469
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