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Evaluation of flood risk at the river reach scale using Shannon’s Entropy Model: a case study of the Damodar River

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Abstract

The Damodar River, a monsoon-influenced river in India, is notorious for its frequent flood events, leading to its designation as the “Sorrow of Bengal.“ The lower Damodar basin (LDB) experiences floods of varying magnitudes almost every year. This study aims to identify areas within the LDB with varying degrees of flood vulnerability, using the Shannon Entropy model and sensitivity analysis. To achieve this objective, ten flood-determining factors are identified and evaluated. The analytical results show that flood vulnerability increases towards the downstream areas, corresponding with various hydro-geomorphic factors. Among these, drainage density is identified as the most significant factor contributing to flooding within the study area. Flood events disrupt daily life and impact numerous socio-economic and socio-cultural infrastructures in the LDB. The findings of this study can assist policymakers in developing scientific management plans to minimize flood risk in the flood-prone areas of the LDB.

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Data Availability

The data that support the findings of this study are available on request from the corresponding author, [DG] upon reasonable request.

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Acknowledgements

We would like to express our gratitude to the Hydraulic Data Division, DVC for kind cooperation in shearing some data and maps. We would like to give thanks to Susanta Mandi, state aided college teacher, Arsha College, Purulia, West Bengal for his kind help in the field work. We are also thankful to Subhadip Pal, Student, Department of Geography, University of Calcutta for his help during field work. Finally we want to express our gratitude to the Department of Geography, University of Calcutta for provide us favourable research environmental.

Funding

This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.

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Contributions

S.S. help in data collection and field assistance [part of the doctoral thesis of S.S.]. The conceptualization of the study and preparation of manuscript and maps have been done by M.B. M.K. help in field data collection and technical assistance. D.M. contributes in field assistance and laboratory work. D.G. conceptualized the model application and finalization of manuscript. Total guidance of the study has been given by D.G.

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Correspondence to Debasis Ghosh.

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The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

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Sheet, S., Banerjee, M., Karmakar, M. et al. Evaluation of flood risk at the river reach scale using Shannon’s Entropy Model: a case study of the Damodar River. Saf. Extreme Environ. 5, 91–107 (2023). https://doi.org/10.1007/s42797-023-00072-w

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