Assessing coastal vulnerability of Chittagong District, Bangladesh using geospatial techniques

摘要

Bangladesh is one of the most vulnerable countries exposed to natural disasters. This paper attempts to analyze the vulnerability of coastal areas of the Chittagong District in the southeastern coast of Bangladesh. This study explores the spatial variations of coastal vulnerability of the study area using three physical variables and four social variables with a spatial analytical method. In this regard, a Physical Vulnerability Index (PVI), and a Social Vulnerability Index (SVI) have been prepared for the research area. Finally, a Coastal Vulnerability Index (CVI) was constructed within a geographic information system combining both PVI and CVI. The vulnerability indices reveal that the rural areas are more vulnerable to disaster than the urban areas. According to the PVI, SVI, and CVI about 66%, 48%, and 43% areas are highly vulnerable respectively. Despite of data limitations in constructing the PVI and SVI, this research is the first endeavor to apply a composite CVI based on geospatial techniques in the southeastern coast of Bangladesh. The CVI results illustrate that the coasts are the most vulnerable to flooding, storm surges and cyclones. In this study, CVI is presented as a tool to identify areas of vulnerability in the zones of the coastal district Chittagong. The CVI will serve as a practical guideline for policy makers to introduce policies and plans to mitigate the natural hazard-induced disaster impacts on the coastal Bangladesh.