01-05 December 2025
INCOIS, Hyderabad, India.
| Abstract Submission No. | ABS-05-0333 |
| Title of Abstract | A range of physical processes contribute to non-tidal residual water levels |
| Authors | Charitha Pattiaratchi*, Toan Bui, Ivica Janekovic |
| Organisation | The University pf Western Australia |
| Address | 35 Stirling Highway Perth, WA, Australia Pincode: 6009 E-mail: chari.pattiaratchi@uwa.edu.au |
| Country | Australia |
| Presentation | Oral |
| Abstract | Storm surges (non-tidal water level) are a hazard, which result in coastal inundation, erosion, and possible loss of lives and is usually defined as the difference between the observed water level and the predicted tide. But there are many different physical processes that contribute to storm surge. Tropical storms (cyclones, hurricanes, typhoons) are among the most energetic forcing agents for the coastal ocean. Physical processes that influence the non-tidal water level associated with storms systems can persists for up to 14 days, beginning 3⿿4 days prior to storm landfall and ceasing up to 10 days after landfall. There is an additional contribution due to the influence of surface gravity waves (wave set-up). The storms also generate long waves with periods in the order of hours to days, which influence the water levels and currents both locally and many thousands of kilometres away. The components of a storm surge include: (1) forerunner, an increase in the mean water level up to several days prior to storm landfall; (2) meteotsunami; (3) continental shelf seiches; (4) edge waves with periods of ~six hours, that move both directions along the coast; and, (5) continental shelf waves, which propagate in a single direction with the coast on their left (right) in the southern (northern) hemisphere, with the restoring force being the Coriolis force. In this presentation, we use field measurements and numerical modelling from Western Australia (North West Shelf and south-west) to identify these processes and define their contribution to the storm surge. |
| Are you part of IIOE-2 endorsed project | no |
| Keywords | storm surge, forerunner, meteotsunami, coastally trapped waves |
| For Awards | no |