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首页> 外文会议>Geoscience and Remote Sensing Symposium, 1999. IGARSS '99 Proceedings. IEEE 1999 International >Observations of bathymetry-induced ocean roughness modulation in in-situ surface slope measurements and coincident airborne SAR images
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Observations of bathymetry-induced ocean roughness modulation in in-situ surface slope measurements and coincident airborne SAR images

机译：测深法引起的海洋粗糙度调制的原地表面坡度测量和机载SAR图像的观测

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Empirical results from a field experiment in the southern North Sea have demonstrated the possibility to detect bathymetry-induced sea surface roughness modulation in the coastal zone using high frequency in-situ slope measurements provided by the Towed Laser Slopemeter. A strong correlation between enhanced/reduced slope power for ocean wavelengths around 50 cm and enhanced/reduced normalized radar cross section (NRCS) at P-band has been established. Areas of smoother and rougher waters were found to occur systematically and consistently up- and down-stream of the sand dune crests, in good agreement with current theory. One case of perfect collocation in both space and time confirmed that the extremes in slope PSD and NRCS are spatially collocated. This dataset allowed the phase shift between the sand dune crests and their radar signature to be estimated at about 50 meters. The occurrence of bathymetry-related modulation was also detected at higher frequencies, although the range of ocean wavelengths affected by the modulation seem to be determined by environmental conditions.
机译：来自北海南部的现场实验的经验结果表明，可以使用拖曳激光坡度仪提供的高频原位坡度测量来检测沿海地区的测深法引起的海面粗糙度调制。在50厘米左右的海洋波长，增强/减小的斜率功率与P波段增强/减小的归一化雷达横截面（NRCS）之间建立了很强的相关性。人们发现，较光滑和较粗糙的水域发生在沙丘峰的上游和下游，是系统的，一致的，这与当前的理论相吻合。在空间和时间上完美搭配的一种情况证实，坡度PSD和NRCS的极端在空间上是搭配的。该数据集可以估计沙丘波峰与其雷达特征之间的相移约为50米。尽管在较高的频率下也可以检测到与测深法相关的调制，尽管受调制影响的海洋波长范围似乎是由环境条件决定的。

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