ANALYSIS OF WAVE CHARACTERISTICS IN OSAKA BAY FOR THREE MAJOR TYPHOONS USING WAVEWATCH III

抄録

 Typhoon generated wave behavior in Osaka Bay under recent three major typhoons (T1820, T1821, and T1824) is simulated and discussed in the study. Simulation was conducted using third generation wave model WAVEWATCH III, and results showed that the impact areas for each typhoon can be explained by looking in to the sea wave properties enter into the bay area. Wave energy is represented with significant wave height related to each categorized components of wave frequency, and their contribution to the damages and critical conditions caused by each typhoon are discussed. Analysis shows that the longer period swell enters into the bay area for T1821 than that of for T1820. In contrary, effect of wind waves for T1820 is larger in North and West side of the bay while T1821 affect more in the Eastward side. In addition, wind data from two sources [Local Forecast Model (LFM) and Meso Scale Model (MSM)] by Japanese Meteorological Agency (JMA) were used in the study and the simulation effectiveness in related to wind source is also discussed in the study. However, results with newer and finer LFM wind data showed better agreement with observations in comparison to weaker MSM wind data.