Development and application of an operational tide and storm surge prediction model for the seas around Taiwan
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Storm surges are abnormal rises in sea level along coastal areas and are mainly formed by strong wind and atmospheric depressions. When storm surges coincide with high tide, coastal flooding can occur. Creating storm surge prediction systems has been an important and operational task worldwide. This study developed a coupled tide and storm surge numerical model of the seas around Taiwan for operational purposes at the Central Weather Bureau. The model was calibrated and verified by using tidal records from seas around Taiwan. Model skill was assessed based on measured records, and the results are presented in details. At 3-minute resolution, tides were generally well predicted, with the root mean-square errors of less than 0.11 m and an overall correlation of more than 0.9. Storms (winds and depressions) were introduced into the model forcing by using the parameter typhoon model. Five typical typhoons that threatened Taiwan were simulated for assessment. The surges were well predicted compared with the records.
Key wordsstorm surge parameter typhoon model wind depression
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