The Objective Analysis, which is widely implemented in routine weather forecasting, is utilized in present study to predict typhoon waves around Taiwan. In order to establish the statistical model, large amount information of historical typhoon waves, which were obtained by observations and the Hybrid Wave Model simulations. Concerning to the input of the wave model, the predicted wind field is derived based on Ekman theory. The present typhoon wave forecasting model is useful for engineering applications when there is no numerical wind field available and providing typhoon wave forecast for a specific site in the offshore or coastal regions is necessary.
According to the statistical typhoon data of the Central Weather Bureau, Taiwan suffers typhoon encroach about 3 to 4 every year, the strong breeze and the huge wave that caused by typhoon not only the breakage to the coast engineering directly, but also threatened the fisherman's life security directly. Take WINNE typhoon in 1997 as an example, although the power and mightiness during WINNE typhoon not equal to HERB typhoon, but it caused sea wall to split which is near Ocean University. It showed that typhoon wave not only the power is strong but also complicacy, so to understand and control ocean data during the period of typhoon is very important. Review the research of typhoon wave can be divided into two, one is a study of typhoon wave hindcasting; the other is the research of typhoon wave characteristic. This paper emphasized on the study of typhoon wave hindcasting, correlative research of this aspect have Bretschneider analyzes 13 data of hurricane, and depend on the Reid energy index sign (Energy Index) offer the formulas of wave height and period of detained typhoon and slow-moving typhoon.
