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GIS-based flood susceptibility mapping of the lower Bagmati basin in Bihar, using Shannon’s entropy model

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Abstract

Floods are the most recurrent weather-related natural disaster causing widespread devastation. In India, about 12% of the land is prone to flood and river erosion where Bihar is the most flood-prone state. The impact of floods becomes more pronounced in areas where population density is relatively high. The study was carried out to prepare a model to identify different levels of flood susceptible zones. A set of multi-sourced geospatial data such as slope, elevation, curvature, rainfall, drainage density, proximity to the river, soil types, land use, stratigraphy, Topographic Ruggedness Index, Sediment Transport Index, and Topographic Wetness Index were considered for the modeling. A flood susceptibility map was produced using Shannon’s entropy model in which the receiver-operating characteristics curve achieved 0.87 accuracy indicating high precision. The outcome of the study demonstrates five different zones of very high, high, medium, low, and very low susceptibility. It was found that very high and high susceptible zones constitute about 52% of the total area that needs a special attention. The findings of the study can be useful to planners and researchers for flood management strategies.

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Acknowledgements

The first author is thankful to the University Grant Commission (UGC) for providing Junior Research Fellowship (JRF) for the doctoral research. The authors are also thankful to the Geological Survey of India, Bihar Disaster Management agencies, NASA, Climatic Research Unit (CRU), and the United States Geological Survey (USGS) for providing necessary data freely.

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This research received no external funding.

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Correspondence to Sohidul Islam.

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Islam, S., Tahir, M. & Parveen, S. GIS-based flood susceptibility mapping of the lower Bagmati basin in Bihar, using Shannon’s entropy model. Model. Earth Syst. Environ. 8, 3005–3019 (2022). https://doi.org/10.1007/s40808-021-01283-5

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  • DOI: https://doi.org/10.1007/s40808-021-01283-5

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