Assessing the impacts of extreme floods on agriculture in Vietnam : Quang Nam case study : a dissertation presented in partial fulfilment of the requirements for the degree of Doctor of Philosophy in Environmental Management at Massey University, Manawatu, New Zealand

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Vietnam is situated within the tropical monsoon and typhoon zone of South-East Asia and is susceptible to extreme flood events. Since the most productive agricultural land is concentrated along the low-lying river systems, losses to agriculture resulting from extreme flooding can be significant. More than 70% of the country's population live in rural areas, many in flood prone zones, and depend upon subsistence agriculture. However, to date, there have only been a limited number of studies addressing the impact of extreme flood events on agriculture in Vietnam. Using the Quang Nam province of central Vietnam as a case study, geographic information systems and digital elevation modeling are used to create geospatial inundation maps of flooded agricultural land. The mapped areas are populated with agricultural land use data and the direct costs of agricultural flood damage are calculated. Additionally, the institutional and legislative framework of Vietnam is assessed to determine whether there may be ways of streamlining systems and institutions to improve responses to extreme flooding events. This study shows that 1:10, 1:20 and 1:100-year flood events result in inundation levels of 27%, 31% and 33% of arable land respectively. The direct crop damage incurred in the inundated regions, expressed as a percentage of total value, are 12%, 56% and 62% respectively. The study also offers recommendations to improve flood management strategies.
Floods, Flood damage prevention, Agriculture, Quảng Nam (Province), Vietnam, Research Subject Categories::INTERDISCIPLINARY RESEARCH AREAS