Abstract
Shikoku Regional Development Bureau has been operating the long-period wave height prediction system since fiscal 2010 as a countermeasure against long-period wave in the Port of Kochi facing the Pacific Ocean. It predicts long-period wave height by using a statistical relational ex-pression that long-period wave height is proportional to the product of significant wave height and sig-nificant wave period. So it is pointed out that it cannot predict that long-period wave height will increase when it only increase nevertheless significant wave do not develop. On the other hand, an ultrasonic wave height meter was installed at the revetment in the Misato area at approximately the same time as the operation of this system was started. At the time of construction of this system, there was a wave height meter only outside the port, and it was not possible to compare and verify the predicted result in-side the port with the actual measurement, but now it is possible. Therefore, this observation data was also used to verify the validity of the prediction, and this system was improved based on the result.
