| Abstract Submission No. | ABS-1.1-0045 |
| Title of Abstract | Sea surface wave assessment during cyclone "Biparjoy" in the Arabian Sea |
| Authors | Dr. G Udhaba Dora, Toyoshima Xavier *, Gopal Krushna Swain, Trupti Bangadkar |
| Organisation | CSIR-NIO RC MUMBAI |
| Address | CSIR-NIO Regional Centre Mumbai, Maharashtra, India Pincode: 400053 E-mail: toyoshimaxavier27@gmail.com |
| Country | India |
| Presentation | Poster |
| Abstract | Periodically, the Arabian Sea is considered one of the most productive aquatic environments and also experiences several extreme conditions, like cyclones, storms, etc. The vigorous nature of cyclones in the Arabian Sea poses a threat to open ocean resources, ecosystems, and habitats, as well as their vulnerability along the coastal belt, especially on the west coast of India. The extreme weather conditions bring significant hazards as a result of energetic sea surface wave activity along the coastal zone, particularly in the low-lying regions. It's crucial to assess the social, economic, and environmental scenarios caused by such extreme weather conditions that impact drastically in a short-term period. The Extremely Severe Cyclonic Storm "Biparjoy" was one of the wake-up calls that persisted from 6th June to 18th June, 2023, in the Arabian Sea. The coastal city, Mumbai, is one of the highly affected zones that were identified during this cyclonic phase. Globally, the sea surface waves have been examined through in-situ observation, reanalysis, and satellite altimeters for exhibition of real-time sea state. The present study aims to examine the cyclone-induced sea surface waves during "Biparjoy" in the coastal water off Mumbai, using in-situ observations, reanalysis data, and satellite altimetry. The sea surface wave was recorded by the Datawell Wave Rider Buoy deployed at a water depth of 10 m, located approximately 6 km from the shore, as well as from the ERA5 reanalysis data and satellite altimeters, namely Jason-3, Sentinel-3A, Sentinel-3B, and CryoSat-2. During this phase, our findings exhibited that ERA5 reanalysis significant wave height underestimated at a rate of 47% as compared to in-situ measurements that recorded up to 4.14 m, while that was 42% with the satellite altimeters. Further, the degree of closeness of ERA5 mean wave period (Tm) and peak wave period (Tp) to in-situ data exhibited overestimation and underestimation at a rate of 19% and 6%, respectively, while the ERA5 waves were propagating with an average (maximum) shortcoming of 14° (34°). Therefore, enhancing the degree of practicality in the multiway observation for projecting the sea state in a realistic form would significantly improve the effectiveness of risk reduction management plans against extreme events for both coastal and open ocean applications, contributing to the achievement of Sustainable Development Goals. |
| Keywords | Coastal Wave; In-situ Observation; Reanalysis Data; Satellite Altimeters; Mumbai Coast |