Gis-Based Analytical Hierarchy Process Modeling for Flood‑prone Area Mapping in Vietnam

Abstract

Flood is a more frequent natural hazard, having destroying effects on human life and property around the world. Water resource management strategies require understanding of the flood susceptibility. This study's objective is to develop an effective new approach to the construction of a flood susceptibility map (FSM) in the Nhat Le-Kien Giang River watershed in Vietnam, based on the analytical hierarchy process (AHP) technique. AHP was used to calculate the weighting of each of nine conditioning factors to build a flood susceptibility map. The results showed that the AHP technique would be successful in constructing a FSM with an AUC value of 0.95. The area of high and very high flood susceptibility in the residential area increased from 95 km² in 2005 to 251 km² in 2020. While the area of high and very high flood susceptibility in the agricultural area increased from 239 km² in 2005 to 245 km² in 2020. The findings of this study can support decision-makers and planners working in flood management and the development of mitigation strategies. Although the approach in this study has been applied to construct a flood susceptibility map for one area in Vietnam, it can be applied both to other types of natural hazards and in other countries.