Effect of Wind Stress on Storm Surge Simulation

• Main Authors: Chin-Chieh Lin, 林敬傑
• Other Authors: Chia-Chuen Kao
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/15694401326891473615

碩士 === 國立成功大學 === 水利及海洋工程學系碩博士班 === 96 === The value of sea-surface stress is known to have impacts on the numerical simulation results of storm surge. To improve the simulation accuracy of storm surge, this research makes an in-depth discussion of the previous studies and proposses a more suitable wind stress formula for the Princeton Ocean Model (POM).The original wind stress formula of POM considers only wind speed. However, regression analysis of the actual meausrement data (Moon, 2004) shows that the predicted sea-suface stress has a greater variation range, which means the wind speed is not the only variable influential to the sea-surface stress. Furthermore, Moon’s study on the influence of wind speed and wave age to the sea surface stress also suggests that dual-variable stress formula that considers both the wind and the wave can provide more accurate calculatuion results and decrease the variation range of the sea-surface stress. This research adopts the formula presented by Janssen (1989), which consider both wave induced stress and turbulence stress, and the SWAN wave model to calculate the wave induced stress. Then, the wave induced stress and the turbulence stress are substituted into POM to simulate the storm surge. A set of historical typhoon data is applied to verify the proposed method. Experiment results show that the presented method can effectively improve the deviation of sea level suggested by POM and make the simulation result closer to the real monitoring value.