:::
107/11/27 14:00 中山大學海洋科學系陳冠宇教授 演講
演講公告
張貼人：網站管理員 ╱ 公告日期：2018-11-21演 講 公 告
主講人：陳冠宇 教授
地點：中央大學科學一館S-325教室
摘要：
講題：Quick Forecast of Tsunamis and Storm Surges
主講人：陳冠宇 教授
中山大學海洋科學系
時間：11月27日（星期二）下午2點
地點：中央大學科學一館S-325教室
摘要：
Usually earthquake scenarios are assumed to provide source conditions for tsunami hazard mitigation. Scenario analysis provides what might happen under some conditions, but we do not know if one scenario is more or less likely than the other. That is, changes beyond what current models project are possible. For example, more than 100,000 scenarios had been used in Japan before 2011. Unfortunately, the Tohoku Tsunami is not one of these scenarios. That is why a fast scenario-independent forecast of tsunami is desirable.
For seismic tsunami, an economic forecast system has been developed to provide both offshore water surface elevation and inundation map based on the reciprocal Green’s function (RGF) of shallow water equations. RGF is based on pre-calculated matrices. Its efficiency and robustness is superior to real-time equation-solving, as has been shown in Chen et al (2015).
Extending RGF approach to storm surges is not straightforward: Fault rupture is much faster than the water wave speed and hence the rupture process can be simply replaced by initial sea surface elevations. Thus, only the response to initial water level is needed. On the other hand, atmospheric forcing continuously contributes to the formation of storm surges and a much more complicated computation is involved. Besides, reciprocities of different Green’s functions are necessary. However, the RGF approach can significantly accelerate the forecast of offshore water level, and the computation process is simpler and more robust than real-time equation-solving.
最後修改時間：2018-11-21 AM 10:14
