抄録
In this study, the workability was assessed for offshore wind farm construction by using the numerical simulations for winds and waves. The predicted wind speeds, significant wave heights and significant wave periods were compared with measurements. Annual average values of absolute monthly error of wind speed, significant wave height and significant wave period were 4.30%, 12.3% and 7.8%, respectively. Then, seasonal occurrence times were examined for measured and predicted wind speeds, significant wave heights and significant wave periods. Predicted wave heights smaller than 1.0 m and predicted wave periods smaller than 6 s overestimated the measurements. The biases of predictions were modeled with linear equations and corrected to improve the accuracy of predictions. Construction records and work criteria of Choshi and Kitakyushu offshore wind farms were investigated and the sensitivity of construction methods on weather downtime were investigated. Choshi had a high sensitivity where the wave condition is severe, while Kitakyushu had a low sensitivity where the wave condition is mild. Finally, the weather downtimes were assessed with the investigated criteria and predicted wind and wave conditions, which had a good accordance with the records.
