01-05 December 2025
INCOIS, Hyderabad, India.
| Abstract Submission No. | ABS-05-0202 |
| Title of Abstract | Impact of Approach Angle of Cyclones Remal and Dana on Storm Surges and Inundation in Coastal Bay of Bengal |
| Authors | Ritama Das*, Sumit Mondal, Prasanta Ray, Tushar Kanti Saha, Anup Kumar Mandal, Neeru Jaiswal, Tarun Kumar De |
| Organisation | Department of Marine Science, University of Calcutta |
| Address | 4, B.N.L 1st Bye Lane Baksara Barojmath Barabagan Howrah-711110 Howrah, West Bengal, India Pincode: 711110 E-mail: ritamadas1234@gmail.com |
| Country | India |
| Presentation | Oral |
| Abstract | The unique configuration and funnel-shaped nature of the Bay of Bengal stand as an area of increased vulnerability, particularly due to storm surge impacts. Among several factors, the approach angle of the tropical cyclone significantly influences surge height variations. This study simulates several surges and associated inundation for cyclones Remal and Dana that affected the Bay of Bengal regions in 2024, by varying the position and angle of their tracks while considering both tides and waves using a tightly coupled SWAN+ADCIRC model. For surge simulating purposes, 18 idealized radiating straight-line tracks originating from the landfall point with an increment angle of 10° have been plotted, taking into consideration real bathymetry data from GEBCO, a 15-arc second gridded bathymetry dataset. The atmospheric forcing required for running the SWAN+ADCIRC model has been derived from the Holland10 model. The combined effects of surge, tide, and wave interactions, along with cyclonic landfall location at different angles, influence the peak water levels. Since Cyclone Remal attained higher wind speeds (~28m/s), lower MSLP (~976 hPa), and higher SST (31.5°C-32.7°C) compared to Cyclone Dana, which had wind speeds of 24.65m/s, MSLP of 985.51 hPa, and SSTs around 30.3°C⿿30.9°C, the maximum water elevation at the landfall locations affected by Cyclone Remal (4-4.5m) is also higher than that of Cyclone Dana (2.4-2.5m). For Cyclone Remal, a progressive increase in surge height is observed after 100°, peaking at 140°-150°, while no noticeable variation in surge height with approach angle is observed for Cyclone Dana, mainly due to its weaker intensity. Although overall water elevation is heavily influenced by tidal variations, approach angle, and bathymetry, the cyclone⿿s strength is a key factor that regulates surge height. |
| Are you part of IIOE-2 endorsed project | no |
| Keywords | SWAN+ADCIRC, Remal, Dana, Bay of Bengal |
| For Awards | no |