IMPROVEMENT OF SUBMERGED DOPPLER-TYPE DIRECTIONAL WAVE METER AND ITS APPLICATION TO FIELD OBSERVATIONS

Noriaki Hashimoto, Masao Mitsui, Yoshimi Goda, Toshihiko Nagai, Tomoharu Takahashi

Abstract


This paper presents an improved submerged Doppler-type directional wave meter which has the capability of measuring water surface elevations and multiple current velocity components. These components are determined from Doppler frequency shifts of ultrasonic waves in water. The improved system has proven to be capable of successfully obtaining tide, current and directional wave data. In addition, this directional wave meter has accurately estimated directional wave spectra in severe sea conditions with the use of some techniques introduced in this paper.

Keywords


field observation; wave meter; submerged meter; Doppler-type directional meter

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