Affiliation:
1. RWDI Consulting Engineers {India) Pvt. Ltd., Trivandrum, India
2. RWDI, Milton Keynes, UK
Abstract
<p>Indian sub-continent is subjected to many severe windstorms and the Indian coastal belt, especially the east coast is threatened by cyclones that have been known to cause damage to structures. However, the root cause of the damage cannot often be equated to high wind speeds exceeding the standard prescribed design wind speeds; but rather linked to lack of maintenance, poor workmanship, improper standard provision application, and poor standard enforcement.</p><p>Note that the frequency of occurrence and associated intensity of storms are the key data required to determine the design speed at a specified risk level with confidence. The lack of cyclone data measurements at landfall is a serious anomaly worldwide including in India, which hinders the development of design speed with confidence. Advanced tropical cyclone wind simulation models have been successfully developed for some tropical cyclone-prone regions.</p><p>In our recent studies, the design wind speeds corresponding to various risk levels were determined based on (i) the number of years of full-scale measurements from airports, (ii) numerically simulated data, as well as (iii) the fast-predictive cyclone wind hazard model. Based on all these studies, it is proven that the current recommended cyclonic factor (k4) in IS 875 (Part 3) will make the wind speed overly conservative. In summary, though the number of storms is on the rise in India, climate change is not warranted to increase the wind speed; at least in the coastal zones yet.</p>
Publisher
International Association for Bridge and Structural Engineering (IABSE)
Reference41 articles.
1. IPCC, 2022: Climate Change 2022: Impacts, Adaptation, and Vulnerability. Contribution of Working Group II to the Sixth Assessment Report of the Intergovernmental Panel on Climate Change [H.-O. Portner, D.C. Roberts,
2. M. Tignor, E.S. Poloczanska, K. Mintenbeck,A. Alegria, M. Craig, S. Langsdorf, S. Loschke,V. Moller, A. Okem, B. Rama (eds.)]. Cambridge University Press. Cambridge University Press, Cambridge, UK and New York, NY, USA, 3056 pp., doi:10.1017/9781009325844.
3. Tabari, H. Climate change impact on flood and extreme precipitation increases with water availability. Sci Rep 10, 13768 (2020).
4. Swain, D. L., Wing, O. E. J., Bates, P. D., Done,J. M., Johnson, K. A., &Cameron, D. R. (2020). Increased flood exposure due to climate change and population growth in the United States. Earth's Future,8, e2020EF001778.Hirabayashi, Y., Alifu, H., Yamazaki, D. et al. Anthropogenic climate change has changed frequency of past flood during 2010-2013. Prog Earth Planet Sci 8, 36 (2021).
5. Camelo, Jeane & Mayo, Talea & Gutmann, Ethan. (2020). Projected Climate Change Impacts on Hurricane Storm Surge Inundation in the Coastal United States. Frontiers in Built Environment. 6.