Abstract
In August 2016, four swimmers were carried away by the waves and drowned at Ishikari-hama beach in Hokkaido. In recent years, several other similar accidents occurred around the Ishikari coast. Therefore, in this paper, we tried to comprehend the features of the current dynamics in Ishikari Bay and Ishikari-hama beach. As research contents, we grasped the accident that occurred in the past years around the Ishikari coast. In this case, we used the on-line database of the newspaper article. As the result, we comprehended the feature of the accident in Ishikari Bay. Secondary, we made a field survey at Ishikari-hama beach. Thirdly, we confirmed the fluctuation of the current in Ishikari Bay due to short time fluctuation of the wind direction. Finally, we simulated the rip current and the wind driven current in Ishikari Bay.
Highlights
Ishikari coast in Hokkaido has a sandy beach which is located in the back of Ishikari Bay
We tried to grasp how the current condition fluctuated by the change of the wind direction when the low pressure or the high pressure passed through Ishikari Bay
When the field survey was conducted at Ishikari-hama beach, the sea and the wind direction were constant, we confirmed the occurrence of the rip current at near the beach and the coastal current at the offshore area
Summary
Data other than those relating to weather, visibility and cloud-related elements are automatically sent every ten seconds from manned stations and some unmanned stations, and every ten minutes from the remaining unmanned stations, of which about 700 observe four elements (precipitation, air temperature, wind direction/speed and sunshine duration) and about 300 observe precipitation In addition to these elements, snow depth is observed at stations in areas of heavy snowfall. It was 2 hours before the accident occurred. In this area, the accident occurred due to the fluctuation of the wave height and the fluctuation of the wind direction. Otaru city 14th August, 2012 Oyadune, Wave H1/3:0.15m, T:3.7s Wind Dir:NW-N, Vel:4-5m/s
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