JAUE2022-030: Surface Water Survey and Localized Waterlogging Risk Assessment in Hanoi, Vietnam

Abstract

This study aims to assess the risk of localized urban waterlogging based on the survey of surface water in the inner city of Hanoi, Vietnam. To achieve this task, the spatial analysis method integrated by ArcGIS, and the open Internet databases were used to generate the contained surface water survey network of Hanoi in 2020. The results show that the natural surface water area has decreased by 37.2% within five years due to urbanization. The area of the artificial lake built up is small and scattered. Achieving data from measurement surveys at 11 vulnerable points for inundation, the author found that there is a significant relationship between the distribution of water-bearing surfaces and the level of waterlogging risk. Congested urban areas that are not connected to surface water are more likely to be vulnerable to inundation. By charting the classification of survey groups according to similar and different characteristics, the analysis is based on indicators to assess the vulnerability of urban inundation to determine the risk of local flooding survey. Finally, this study shows the importance of surface water construction practices in urban inundation risk management and can be used as an example of the current state of the surface survey to contribute to the construction of the basis for urban planning