NEAR-BOTTOM CURRENT MEASURED BY ACOUSTIC SENSORS

[摘要] A vertical current profile has been measured with three acoustic meters 60 cm, 100 cm and 200 cm from the sea bottom. The depth at the measuring site was 84 metres. The profile is found to depend on the time scale of the water particle motion. An Ekman-like turning of the current is also observed, and the thickness of friction layers is estimated. Comparison of the current data with wave measurements indicates that the vertical transfer of surface wave energy is 30-50 per cent less than first order wave theory prescribes.

[学科分类] 建筑学

[关键词] current;bottom current;acoustic sensor