Research on World Agricultural Economy

Does Adaptation to Saltwater Intrusion Improve Household Income in the Mekong Delta, Vietnam?

Phuong M.H. Pham

Faculty of Finance and Banking, Academy of Policy and Development, Hanoi 10000, Vietnam

Tung D. Nguyen

Faculty of Finance and Banking, Academy of Policy and Development, Hanoi 10000, Vietnam

Viet Ha Hoang

University of Economics and Business, Vietnam National University, Hanoi 10000, Vietnam

Van-Chung Dong

International School, Vietnam National University, Hanoi 10000, Vietnam

DOI: https://doi.org/10.36956/rwae.v6i2.1661

Received: 6 January 2025 | Revised: 5 February 2025 | Accepted: 18 February 2025 | Published Online: 2 April 2025

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Abstract

Saltwater intrusion poses a substantial threat to agricultural industry. Employing an instrument variable approach, this study used a survey of 469 households affected by saltwater intrusion in the selected provinces in Mekong Delta, Vietnam to investigate the impact of adaptation methods to saltwater intrusion on household income. The findings reveal that adopting agricultural transformation, applying technology in crop cultivation and aquaculture, and implementing multiple adaptation methods can improve household income. Meanwhile, no significant effect is observed from job change. The results are robust when incorporating the alternative measurement of household income, say net income. The study also shows that heterogeneous effects exist when considering different sectors of agricultural industry, say crop cultivation and aquaculture. Given that, the study provides some policy implications for the local government and farmers to alleviate the adverse impacts of saltwater intrusion and improve their livelihoods, contributing to the sustainable development of Vietnam’s agricultural industry.

Keywords: Adaptation Methods; Household Income; Mekong Delta; Saltwater Intrusion; Vietnam

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References

[1] Wiebe, K., Robinson, S., Cattaneo, A., 2019. Climate change, agriculture and food security: impacts and the potential for adaptation and mitigation. In: Sustainable Food and Agriculture: An Integrated Approach. pp. 55–74.

[2] Adeosun, O.T., Owolabi, K.E., 2021. Gender inequality: determinants and outcomes in Nigeria. Journal of Business and Socio-economic Development. 1(2), 165–181.

[3] Ahsan, F., Chandio, A.A., Fang, W., 2020. Climate change impacts on cereal crops production in Pakistan: Evidence from cointegration analysis. International Journal of Climate Change Strategies and Management, 12(2), 257–269.

[4] de Araujo Barbosa, C.C., Dearing, J., et al., 2016. Evolutionary social and biogeophysical changes in the Amazon, Ganges–Brahmaputra–Meghna and Mekong deltas. Sustainability Science. 11, 555–574.

[5] General Statistic Office, 2021. The Mekong River Delta – Harnessing the Potential of Vietnam’s Premier Rice Basket. Available from: https://www.gso.gov.vn/du-lieu-va-so-lieu-thong-ke/2021/08/dong-bang-song-cuu-long-phat-huy-loi-the-vua-lua-so-mot-ca-nuoc/ (cited 29 Octorber 2024).

[6] Khong, T.D., Young, M.D., Loch, A., et al., 2018. Mekong River Delta farm-household willingness to pay for salinity intrusion risk reduction. Agricultural Water Management. 200, 80–89.

[7] Directorate of Fisheries, 2021. Socio-Economic Development in the Mekong River Delta Region. Available from: https://tongcucthuysan.gov.vn/vi-vn/Tin-t%E1%BB%A9c/-Tin-v%E1%BA%AFn/doc-tin/016405?2021-10-28=Banner+003 (cited 28 October 2024).

[8] Vu, P.-L., Frappart, F., Darrozes, J., et al., 2018. Comparison of water level changes in the Mekong River using GNSS reflectometry, satellite altimetry and in-situ tide/river gauges. Proceedings of the IGARSS 2018-2018 IEEE International Geoscience and Remote Sensing Symposium; Valencia, Spain; 22–27 July 2018. pp. 8408–8411.

[9] Tran, T.A., Dang, T.D., Nguyen, T.H., 2021. Moving towards sustainable coastal adaptation: Analysis of hydrological drivers of saltwater intrusion in the Vietnamese Mekong Delta. Science of The Total Environment. 770, 145125.

[10] Khong, T.D., Loch, A., Young, M.D., 2020. Perceptions and responses to rising salinity intrusion in the Mekong River Delta: What drives a long-term community-based strategy? Science of The Total Environment. 711, 134759.

[11] Global Facility for Disaster Reduction and Recovery, 2011. Vulnerability, Risk Reduction and Adaption to Climate Change Viet Nam, Climate Change and Adaption Country Profile. The World Bank. Available from: https://www.uncclearn.org/wp-content/uploads/library/wb118.pdf (cited 20 Octorber 2024 ).

[12] Le Dang, H., Li, E., Bruwer, J., et al., 2014. Farmers’ perceptions of climate variability and barriers to adaptation: Lessons learned from an exploratory study in Vietnam. Mitigation and Adaptation Strategies for Global Change. 19, 531–548.

[13] Bravard, J.-P., Goichot, M., Gaillot, S., 2013. Geography of sand and gravel mining in the Lower Mekong River. First survey and impact assessment. EchoGéo. 26.

[14] Eslami, S., Hoekstra, P., Nguyen Trung, N., et al., 2019. Tidal amplification and salt intrusion in the Mekong Delta driven by anthropogenic sediment starvation. Scientific Reports. 9(1), 18746.

[15] Ferguson, G., Gleeson, T., 2012. Vulnerability of coastal aquifers to groundwater use and climate change. Nature Climate Change. 2(5), 342–345.

[16] Lee, D.Y., De Meo, O.A., Thomas, R.B., et al., 2016. Design and construction of an automated irrigation system for simulating saltwater intrusion in a tidal freshwater wetland. Wetlands. 36, 889–898.

[17] Park, E., Ho, H.L., Tran, D.D., et al., 2020. Dramatic decrease of flood frequency in the Mekong Delta due to river-bed mining and dyke construction. Science of The Total Environment. 723, 138066.

[18] Trieu, T.T.N., Phong, N.T., 2015. The impact of climate change on salinity intrusion and Pangasius (Pangasianodon Hypophthalmus) farming in the Mekong Delta, Vietnam. Aquaculture International. 23, 523–534.

[19] Vu, D., Yamada, T., Ishidaira, H., 2018. Assessing the impact of sea level rise due to climate change on seawater intrusion in Mekong Delta, Vietnam. Water Science and Technology. 77(6), 1632–1639.

[20] Hoan, N.X., Nguyen Khoi, D., Trung, L.D., 2019. Assessing the adaptive capacity of farmers under the impact of saltwater intrusion in the Vietnamese Mekong Delta. Journal of Environmental Planning and Management. 62(9), 1619–1635.

[21] Khai, H.V., Dang, N.H., Yabe, M., 2018. Impact of salinity intrusion on rice productivity in the Vietnamese Mekong Delta. DOI: https://doi.org/10.5109/1911216

[22] Nhan, D.K., Phap, V.A., Phuc, T.H., et al., 2012. Rice production response and technological measures to adapt to salinity intrusion in the coastal Mekong delta. Can Tho University: Can Tho, Vietnam.

[23] Thach, K.S.R., Lee, J.Y., Ha, M.T., et al., 2023. Effect of saline intrusion on rice production in the Mekong River Delta. Heliyon. 9(10).

[24] Tri, N.H., Choowaew, S., Van Ni, D., et al., 2019. Impact of saline intrusion and adaptation options on rice-and fish-farming households in the Mekong Delta of Vietnam. Kasetsart Journal of Social Sciences. 40(2), 427–433.

[25] Minh, H.V.T., Lavane, K., Ty, T.V., et al., 2022. Evaluation of the impact of drought and saline water intrusion on rice yields in the Mekong delta, Vietnam. Water. 14(21), 3499.

[26] Nguyen, H.T.N., 2023. Rising Tides, Falling Harvests: Examining the Effects of Salinity Intrusion on Paddy Production in Lower Mekong Delta, Vietnam [Doctoral dissertation]. Blacksburg, VA, USA: Virginia Polytechnic Institute and State University.

[27] Truc, N.T.T., Khoa, D.D., 2023. Impact of saltwater intrusion on poverty in rural households in the Mekong Delta, Vietnam. Nurture. 17(4), 557–570.

[28] Trang, N.T., Tu, V.H., Khai, H.V., et al., 2018. The determinants behind changes of farming systems and adaptation to salinity intrusion in the coastal regions of Mekong Delta. DOI: https://doi.org/10.5109/1955664

[29] Brown, P.R., Tuan, V.V., Nhan, D.K., et al., 2018. Influence of livelihoods on climate change adaptation for smallholder farmers in the Mekong Delta Vietnam. International Journal of Agricultural Sustainability. 16(3), 255–271.

[30] Nguyen, T.D.L., Defloor, B., Speelman, S., et al., 2024. Does Adaptation to Saltwater Intrusion Improve the Livelihoods of Farmers? Evidence for the Central Coastal Region of Vietnam. Sustainability. 16(14), 6216.

[31] Thanh Truc, N.T., Thuc, L.V., 2022. Impacts of adopting specialized agricultural programs relying on “good practice” - Empirical evidence from fruit growers in Vietnam. Open Agriculture. 7(1), 39–49.

[32] Hansen, L.P., 1982. Large sample properties of generalized method of moments estimators. Econometrica: Journal of the Econometric Society. 50(4), 1029–1054.

[33] Loc, H.H., Lixian, M.L., Park, E., et al., 2021. How the saline water intrusion has reshaped the agricultural landscape of the Vietnamese Mekong Delta, a review. Science of the Total Environment. 794, 148651.

[34] Dey, S., Prakash, O., 2020. Management of saltwater intrusion in coastal aquifers: An overview of recent advances. Environmental Processes and Management: Tools and Practices. 321–344.

[35] Rahman, M.S., Kazal, M.M.H., Rayhan, S.J., 2020. Impacts of the training of mud crab farmers: An adaptation strategy to cope with salinity intrusion in Bangladesh. Marine Policy. 120, 104159.

[36] Czajkowski, J., Engel, V., Martinez, C., et al., 2018. Economic impacts of urban flooding in South Florida: Potential consequences of managing groundwater to prevent salt water intrusion. Science of The Total Environment. 621, 465–478.

[37] Azevedo de Almeida, B., Mostafavi, A., 2016. Resilience of infrastructure systems to sea-level rise in coastal areas: Impacts, adaptation measures, and implementation challenges. Sustainability. 8(11), 1115.

[38] Toan, T.Q., 2014. Climate change and sea level rise in the Mekong Delta: flood, tidal inundation, salinity intrusion, and irrigation adaptation methods. In: Coastal Disasters and Climate Change in Vietnam, pp. 199–218. Elsevier.

[39] Hausman, J.A., 1978. Specification tests in econometrics. Econometrica: Journal of the Econometric Society. 1251–1271.

[40] Staiger, D., Stock, J., 1997. Instrumental variables regression with weak instruments. Econometrica. 65(3), 557–586.

[41] Kim Dang, K., Do, T.H., Le, T.H.L., et al., 2021. Impacts of farmers' adaptation to drought and salinity intrusion on rice yield in Vietnam's Mekong Delta. Journal of Agribusiness in Developing and Emerging Economies. 11(1), 27–41.

[42] van Aalst, M., Koomen, E., de Groot, H., 2023. Vulnerability and resilience to drought and saltwater intrusion of rice farming households in the Mekong delta, Vietnam. Economics of Disasters and Climate Change. 7(3), 407–430.

[43] Nguyen, M.T., Renaud, F.G., Sebesvari, Z., 2019. Drivers of change and adaptation pathways of agricultural systems facing increased salinity intrusion in coastal areas of the Mekong and Red River deltas in Vietnam. Environmental Science & Policy. 92, 331–348.

[44] Becker, G.S., 2009. Human capital: A theoretical and empirical analysis, with special reference to education. University of Chicago Press: Chicago, IL, USA.

[45] Mincer, J., 1993. Wage changes in job changes. In: Studies in Human Capital. Edward Elgar Publishing: Cheltenham, UK. pp. 184–211.

[46] Tran, D.D., Nguyen, T.D., Park, E., et al., 2023. Rural out-migration and the livelihood vulnerability under the intensifying drought and salinity intrusion impacts in the Mekong Delta. International Journal of Disaster Risk Reduction. 93, 103762.

[47] Xiao, H., Tang, Y., Li, H., et al., 2021. Saltwater intrusion into groundwater systems in the Mekong Delta and links to global change. Advances in Climate Change Research. 12(3), 342–352.

[48] Burkett, V., Davidson, M., 2012. Coastal impacts, adaptation, and vulnerabilities. Springer: Berlin, Germany.

[49] Nhung, T.T., Le Vo, P., Van Nghi, V., et al., 2019. Salt intrusion adaptation measures for sustainable agricultural development under climate change effects: A case of Ca Mau Peninsula, Vietnam. Climate Risk Management. 23, 88–100.

[50] Diep, N.T.H., Trung, P.K., Nhung, D.T.C., et al., 2022. Adaptation to saline intrusion for agriculture farming transformation in the coastal Ben Tre province, Vietnam. IOP Conference Series: Earth and Environmental Science.

[51] Tran, D.D., Dang, M.M., Du Duong, B., et al., 2021. Livelihood vulnerability and adaptability of coastal communities to extreme drought and salinity intrusion in the Vietnamese Mekong Delta. International Journal of Disaster Risk Reduction. 57, 102183.