zadovoljstvo nam je pozvati vas na 88. Fakultetski seminar 29. 9. 2026. u B3-47 u 12:15 sa sljedećim temama:
- Typhoon-generated meteotsunamis along the coast of Southeast China
- Typhoon-Induced Dynamic Environments in the South China Sea and Rapid Probabilistic Assessment of Offshore Structural Safety
koji će održati Dr. Hao He i Mr. Yang Zhiheng s Department of Hydraulic Engineering of Tsinghua University in Beijing, Kina. Sažetak i kratki životopisi predavača se nalaze dolje, a u prilogu je plakat za društvene mreže.
- Sažetak
This study aims to clarify whether significant sea level oscillations in the tsunami-frequency band (i.e., meteotsunamis) can be induced during typhoon events, and to examine their relationship with typhoon mesoscale spiral bands. Sea level records and weather radar reflectivity data were analyzed for typhoon events that made landfall on the coast of Southeast China during 2014-2022. Significant sea level oscillations with a period of less than 2 hours occasionally occur as typhoons approach the coast. Typhoon Mangkhut (2018) is taken as a typical case, triggering a meteotsunami with an amplitude of approximately 0.2 m. Numerical experiments have been conducted to verify whether such oscillations can be induced by the mesoscale spatial structures typically connected with typhoons, by forcing the ocean model with synthetic pressure perturbations of shape and speed captured by weather radars. The model reproduces well the observed amplitude and onset of sea level oscillations for Typhoons Mangkhut, Hato and Nuri, in which synthetic pressure perturbations were derived linearly from radar reflectivity.
- Kratki životopis
Dr. Hao He is a doctoral student in the Department of Hydraulic Engineering of Tsinghua University in Beijing, China. His research focuses on marine hazards along the southern coast of China, mainly including tsunamis, storm surges and meteotsunamis. He is currently working primarily on risk assessment and rapid forecasting of storm surges and meteotsunamis generated by typhoons.
- Sažetak
Typhoons are the primary extreme metrological disasters affecting the coastal of southern China. The strong winds, large waves, strong currents, and storm surges induced by typhoons are the dominant dynamic factors in this region, and their combined effects seriously threaten the integrity of offshore structures. This study reconstructed 807 typhoon events in the northern South China Sea from 1949 to 2022 and simulated hydrodynamic environments such as storm surges, storm waves, and strong currents. Based on statistical methods, the variation trends of design wave heights were analyzed. A probability-based wind-wave assessment model was proposed, which can provide the most probable wave height and the wave height variation range with 90% confidence for any location and any wind speed condition. The study revealed the time-lag effects of dynamic factors and deepened the understanding of the development process and spatial heterogeneity characteristics of typhoon-induced dynamic hazards. In terms of structural safety assessment, combined with ensemble forecasting techniques, the impact of typhoon forecast errors on structural responses was investigated, and surrogate models for various dynamic factors were established using machine learning methods to meet the computational needs of ensemble forecasting for large-scale samples. Ultimately, rapid probabilistic assessment of offshore structural safety during typhoon processes in the South China Sea was achieved, providing key technical support for typhoon disaster emergency protection in coastal areas.
- Kratki životopis
Mr. Yang Zhiheng is a PhD student in the Department of Hydraulic Engineering of Tsinghua University in Beijing, China. His research mainly focuses on marine hydrodynamic characteristics analysis, typhoon disaster research, and offshore structural safety assessment. Related researches have been published in journals such as Coastal Engineering, Ocean Engineering, and Reliability Engineering & System Safety.
