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<p>This study assesses the susceptibility to natural hazards in the Safsaf watershed, located in northeastern Algeria, by analyzing land use and land cover characteristics derived from satellite imagery. Multi-spectral indices—including the Normalized Difference Vegetation Index, Normalized Difference Water Index, Modified Normalized Difference Water Index, Soil Adjusted Vegetation Index, Normalized Burn Ratio, and Normalized Difference Built-up Index—were extracted from Landsat 8 data to identify environmental features influencing hazard vulnerability. The Normalized Difference Water Index and Modified Normalized Difference Water Index values (ranging from 0.24 to −&#xa0;0.36) delineate water bodies and moisture-rich zones, while Soil Adjusted Vegetation Index values (−&#xa0;0.26 to 0.84) reflect a gradient from bare soil to dense vegetation. Normalized Difference Vegetation Index values (−&#xa0;0.17 to 0.56) indicate varying levels of vegetation health, and Normalized Difference Built-up Index values (−&#xa0;0.37 to 0.27) identify urbanized or built-up areas associated with socio-economic activity. Integrated with digital elevation model analysis, the results reveal that low-lying areas exhibiting high Normalized Difference Water Index/Modified Normalized Difference Water Index, positive Normalized Difference Built-up Index, and low Normalized Difference Vegetation Index values are most susceptible to natural hazards. This integrative approach offers a valuable spatial perspective for sustainable watershed management and hazard mitigation planning.</p>

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Remote sensing-based assessment of natural hazard susceptibility in the Safsaf watershed, Northeast Algeria

  • 期刊论文

  • 发表日期：

    2025年9月4日

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  • R. S. Ramdani,
  • C. Fehdi,
  • N. E. H. Gueraidia,
  • S. Gueraidia,
  • S. Hafnaoui

摘要

This study assesses the susceptibility to natural hazards in the Safsaf watershed, located in northeastern Algeria, by analyzing land use and land cover characteristics derived from satellite imagery. Multi-spectral indices—including the Normalized Difference Vegetation Index, Normalized Difference Water Index, Modified Normalized Difference Water Index, Soil Adjusted Vegetation Index, Normalized Burn Ratio, and Normalized Difference Built-up Index—were extracted from Landsat 8 data to identify environmental features influencing hazard vulnerability. The Normalized Difference Water Index and Modified Normalized Difference Water Index values (ranging from 0.24 to − 0.36) delineate water bodies and moisture-rich zones, while Soil Adjusted Vegetation Index values (− 0.26 to 0.84) reflect a gradient from bare soil to dense vegetation. Normalized Difference Vegetation Index values (− 0.17 to 0.56) indicate varying levels of vegetation health, and Normalized Difference Built-up Index values (− 0.37 to 0.27) identify urbanized or built-up areas associated with socio-economic activity. Integrated with digital elevation model analysis, the results reveal that low-lying areas exhibiting high Normalized Difference Water Index/Modified Normalized Difference Water Index, positive Normalized Difference Built-up Index, and low Normalized Difference Vegetation Index values are most susceptible to natural hazards. This integrative approach offers a valuable spatial perspective for sustainable watershed management and hazard mitigation planning.