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Assessing the influence of land use and land cover data on cyclonic winds and coastal inundation due to tropical cyclones: a case study for the east coast of India

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Abstract

A standalone Advanced Circulation (ADCIRC) model for the east coast of India with a high-resolution grid of 100 m near the coast is used to evaluate coastal inundation resulting from the storm tides generated by recent cyclones. A directional surface roughness parametrization that alters wind speed and Manning’s n friction coefficient to compute bottom friction based on land use/land cover (LULC) at a particular location is incorporated in the model. ERA5 reanalysis winds highlight that the cyclonic winds over the land are less intensive than nearby coastal oceans, particularly during landfall time, by approximately 29%–50%. Experiments are also designed to quantify the impact of surface and bottom friction on wind speed and the inward propagation of storm tides. A comparison of cyclonic wind speed after incorporating LULC data in the model is made with an automatic surface observation system (ASOS). It suggests a 15%–29% reduction, consistent with ASOS. The inundated area computed for the cyclones advocates a significant reduction (15%–50%) due to LULC. Sensitivity experiments with LULC are performed to examine the impact of mangroves in the Krishna estuary located in between two concave-shaped coastal geometries. Replacing wetlands with Mangroves results in a simultaneous decline in wind speed (12.5%) and inundated area (13.4%). It also highlights that bottom friction contributes (9.4%) in the inundated area against surface friction (4%). This study infers that further investigation and planning are mandatory to ensure coastal mangrove restoration initiatives and effective coastal management practices.

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Acknowledgements

The authors sincerely acknowledge the Indian Space Research Organization (ISRO) for providing financial support to carry out this study through a project sanctioned under IIT Delhi Space Technology Cell (STC) in collaboration with the Space Applications Centre, Ahmedabad. The authors also thank IIT Delhi HPC facility for affording computational resources.

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Pawan Tiwari: Conceptualization, Formal analysis, Investigation, Methodology, Software, Validation, Visualization, Writing – original draft, Writing – review & editing. A D Rao: Conceptualization, Methodology, Supervision, Visualization, Writing – review & editing. Smita Pandey: Methodology, Visualization, Writing – review & editing. Vimlesh Pant: Writing – review & editing.

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Correspondence to Pawan Tiwari.

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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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Tiwari, P., Rao, A.D., Pandey, S. et al. Assessing the influence of land use and land cover data on cyclonic winds and coastal inundation due to tropical cyclones: a case study for the east coast of India. Nat Hazards (2024). https://doi.org/10.1007/s11069-024-06603-3

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  • DOI: https://doi.org/10.1007/s11069-024-06603-3

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