首页> 美国政府科技报告 >Influence of Bubbles on Sea Surface Backscatter Measurements (Der Einfluss von Blasen auf die Messung der Rueckstreueigenschaften der Meeresoberflaeche)
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Influence of Bubbles on Sea Surface Backscatter Measurements (Der Einfluss von Blasen auf die Messung der Rueckstreueigenschaften der Meeresoberflaeche)

机译:气泡对海面背向散射测量的影响(Der Einfluss von Blasen auf die messung der Rueckstreueigenschaften der meeresoberflaeche)

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摘要

Results from a recent sea surface acoustic scattering experiment, conducted in the North Sea, are presented with accompanying sea surface roughness parameters and subsurface bubble information. The acoustic data were obtained using a high resolution (narrow beamwidth) pulsed parametric sonar transmitter and conventional receiver. Scattering strength values were obtained as a function of frequency (3-18 kHz) for wind speeds from 2 to 45 knots. It appears that the backscattering strength at a 30 deg grazing angle is caused by the high frequency wavenumber spectrum at low wind speeds and by sub-surface bubbles at high wind speeds. The backscattering strength shows strong fluctuations in the intermediate region caused by both scattering mechanisms. Keywords: Ocean waves; Parametric sonar; Radar backscatter; Reverberation; Surface roughness dependence; Shallow water; Wave height dependence; Wind dependence; Acoustic scattering stren th; Frequency dependence; Grazing angle Dependence.

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