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<p>Climate change has posed a serious global challenge, prompting various initiatives to build resilience, including vulnerability assessments, in pursuit of Sustainable Development Goal 13. This paper endeavours to construct a multi-hazard inventory for the Keleghai river basin in southern West Bengal, India, employing remote sensing (RS) data. To achieve this, the Analytical Hierarchy Process (AHP) has been utilized to compute the weighted values of various hazard categories based on their respective degrees of impact. A spatial correlation among the weighted values of the identified hazard categories has been established. Consequently, a multi-hazard vulnerability zone map of the Keleghai river basin has been developed. In the formulation of the multi-hazard inventory for the study area, diverse indicators have been adopted to evaluate the significance of different hazards and the factors contributing to vulnerability, including flood (Topographical Wetness Index, TWI), drought (Normalized Difference Moisture Index, NDMI), forest cover loss (Differential Normalised Difference Vegetation Index, dNDVI), soil erosion (Revised Universal Soil Loss Equation, RUSLE), salinization (Normalized Difference Salinity Index, NDSI), heat wave (Land Surface Temperature, LST), population density, and built-up area (Normalized Difference Built-up-area Index, NDBI). The findings of the study indicate that over 50% of the basin’s area is classified within the high or very high vulnerability zones, with an additional 20% categorized as ‘moderate’. The eastern, western and northern parts of the study area exhibit the maximum exposure to multiple hazards. The investigation reveals that flooding is the predominant vulnerability factor within the basin, which exacerbates soil loss dynamics. Furthermore, the loss of forest cover and the expansion of built-up areas emerge as significant determinants influencing flood occurrences. Consequently, it is recommended that concerted efforts be made to enhance forest cover through various feasible strategies to mitigate the adverse effects of multiple hazards within the river basin under scrutiny. This study may serve as a valuable reference for authorities engaged in hazard management when developing policies pertinent to the Keleghai River Basin.</p>

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Multi-hazard Vulnerability Assessment Through RS-GIS and AHP: A Geo-Spatial Study of Keleghai River Basin in India

  • 期刊论文

  • 发表日期：

    2025年8月27日

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  • Anirban Roy,
  • Sarbendu Bikash Dhar

摘要

Climate change has posed a serious global challenge, prompting various initiatives to build resilience, including vulnerability assessments, in pursuit of Sustainable Development Goal 13. This paper endeavours to construct a multi-hazard inventory for the Keleghai river basin in southern West Bengal, India, employing remote sensing (RS) data. To achieve this, the Analytical Hierarchy Process (AHP) has been utilized to compute the weighted values of various hazard categories based on their respective degrees of impact. A spatial correlation among the weighted values of the identified hazard categories has been established. Consequently, a multi-hazard vulnerability zone map of the Keleghai river basin has been developed. In the formulation of the multi-hazard inventory for the study area, diverse indicators have been adopted to evaluate the significance of different hazards and the factors contributing to vulnerability, including flood (Topographical Wetness Index, TWI), drought (Normalized Difference Moisture Index, NDMI), forest cover loss (Differential Normalised Difference Vegetation Index, dNDVI), soil erosion (Revised Universal Soil Loss Equation, RUSLE), salinization (Normalized Difference Salinity Index, NDSI), heat wave (Land Surface Temperature, LST), population density, and built-up area (Normalized Difference Built-up-area Index, NDBI). The findings of the study indicate that over 50% of the basin’s area is classified within the high or very high vulnerability zones, with an additional 20% categorized as ‘moderate’. The eastern, western and northern parts of the study area exhibit the maximum exposure to multiple hazards. The investigation reveals that flooding is the predominant vulnerability factor within the basin, which exacerbates soil loss dynamics. Furthermore, the loss of forest cover and the expansion of built-up areas emerge as significant determinants influencing flood occurrences. Consequently, it is recommended that concerted efforts be made to enhance forest cover through various feasible strategies to mitigate the adverse effects of multiple hazards within the river basin under scrutiny. This study may serve as a valuable reference for authorities engaged in hazard management when developing policies pertinent to the Keleghai River Basin.