Strong Winds and High Waves Observed at Tanabe-Nakashima Observation Tower in the Summer of 2018

This report shows the field observation results conducted in the summer of 2018. The intensive field observation has been carried out for two and a half months (from August to November) at the observation tower of Shirahama Oceanographic Observatory. During the observation, three typhoons (No.20, 21, 24) approached the Kii peninsula, and the typhoon Jebi (No.21) and the typhoon Trami (No.24) brought sever wind and wave conditions. The observed maximum significant wave height and maximum instantaneous wind velocity are 11.09m by No.24 and 55.79m/s by No.21, respectively. High wave conditions caused significant damage to measurement devices on the observation tower which are installed for wave observation at the level of 10m high from mean sea level. Fortunately, wave data measured by ADCP (Acoustic Doppler Current Profiler) has a good agreement with wave data by measurement devices on the observation tower, and there is no major problem in data collection during high wave and strong wind conditions.