Abstract
Vietnam has been extensively affected by floods, suffering heavy losses in human life and property. While the Vietnamese government has focused on structural measures of flood defence such as levees and early warning systems, the country still lacks flood risk assessment methodologies and frameworks at local and national levels. In response to this gap, this study developed a flood risk assessment framework that uses historical flood mark data and a high-resolution digital elevation model to create an inundation map, then combined this map with exposure and vulnerability data to develop a holistic flood risk assessment map. The case study is the October 2010 flood event in Quang Binh province, which caused 74 deaths, 210 injuries, 188,628 flooded properties, 9019 ha of submerged and damaged agricultural land, and widespread damages to canals, levees, and roads. The final flood risk map showed a total inundation area of 64,348 ha, in which 8.3% area of low risk, 16.3% area of medium risk, 12.0% area of high risk, 37.1% area of very high risk, and 26.2% area of extremely high risk. The holistic flood risk assessment map of Quang Binh province is a valuable tool and source for flood preparedness activities at the local scale.
Highlights
Rivers have always been used as a water resource for food and hygiene needs as well as for agricultural and industrial harvesting
Studies on flood risk analysis have been increasingly conducted in Vietnam, there is a lack of research on detailed flood risk assessment maps, at local levels
We developed a detailed flood risk assessment map for Quang Binh province of Vietnam
Summary
Rivers have always been used as a water resource for food and hygiene needs as well as for agricultural and industrial harvesting. Floods cause serious harm to people and adversely affect socio-economic development around the world, especially in urban areas where the high risks of flooding are the consequences of urbanisation and urban development [3]. Vietnam is located in the tropical zone with unique characteristics, populations settle in low-lying coastal areas such as the narrow plains along the central coast of Vietnam, the Red River Delta, and the Mekong Delta, making it vulnerable to floods [7]. It has experienced a process of rapid urbanisation in recent decades. To counter the growing threat posed by floods, a range of effective adaptation strategies are needed
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