DEPTH-CURRENT INVERSION FROM A STORMY WAVE FIELD WITH X-BAND RADAR
An X-band nautical radar system was employed to observe wave field during a storm around the research pier HORS in Hasaki, Japan. The radar system provides instantaneous distributions of wave crests in the near-shore region, with image sequences comprising a clear spatial and temporal variation of wave pattern. The frequency spectra of radar echo signals exhibit two distinct peaks generated by coexistence of storm and wind wave. The sequence of radar images was filtered with the dominant frequencies and wave trains from two different directions were observed. Wave number components were estimated with Maximum Entropy Method (MEM) from the filtered images and used for depth current inversion with linear theory. The inverted water depth matches well with the surveyed depth and the estimated long-shore current is directed to the down-wave of the predominant frequency wave component; however, validation of current magnitude is not confirmed due to limitation of field data. The linear estimates of hydrodynamic parameters during the passage of the storm are presented in this paper to demonstrate the potential of radar measurements.
HORS X-band nautical radar linear analyses MEM depth-current inversion and storm event.
G. M. Jahid Hasan Satoshi Takewaka
Dept.of Eng. Mechanics and Energy, University of Tsukuba, 305-8573, Japan
国际会议
第四届亚太地区海岸会议(the Fourth International Conference on Asian and Pacific Coasts)
南京
英文
2007-09-21（万方平台首次上网日期，不代表论文的发表时间）