Comparisons between HF radar and SAR current measurements in the Iroise Sea
Comparisons between HF radar and SAR current measurements in the Iroise Sea
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伊鲁瓦兹海 HF 雷达和 SAR 当前测量的比较
DOI：
10.1109/oceanse.2007.4302424
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发表时间：
2007
期刊：
影响因子：
--
通讯作者：
F. Collard
中科院分区：
文献类型：
--
作者：
C. Danilo;B. Chapron;A. Mouche;R. Garello;F. Collard
在沿海海洋学中，很难以良好的时间和空间分辨率测量海流。然而，这些电流的精确知识对于污染监测等某些应用至关重要。到目前为止，很少有仪器能够提供电流测量。虽然基于高频雷达和基于卫星的合成孔径雷达（SAR）的技术是有前途的，这两种方法之间的比较必须仔细制定，因为不同的方法在散射几何形状，辐射频率和天线足迹。在本文中，我们提出了一个简短的回顾这两种方法，以及它们之间的比较使用的数据在法国的Iroise海。由于在这一地区的电流的主要来源是潮汐的性质，我们还比较了结果的潮汐模型MARS 2D预测的电流。结果令人鼓舞：SAR导出的电流（具体地，电流在沿着SAR波束的径向方向上的分量）定性地类似于从HF测量和MARS 2D输出推导出的等效投影径向分量。然而，必须指出的是，高频雷达的结果可能会受到岛屿的影响，而SAR的结果可能会受到风浪的影响。
In coastal oceanography, currents are difficult to measure with a good temporal and spatial resolution. Nevertheless, precise knowledge of these currents is crucial for certain applications such as pollution monitoring. Up until now, very few instruments have been able to provide current measurements. Although techniques based on HF radar and satellite-based Synthetic Aperture Radar(SAR) are promising, comparisons between these two approaches must be carefully formulated since the approaches differ in terms of scattering geometry, radiation frequency, and antenna footprint. In this document, we present a brief review of these two approaches as well as a comparison between them using data acquired over the Iroise Sea in France. Since the dominant source of currents in this area is tidal in nature, we also compare the results to the currents predicted by the tidal model MARS2D. The results are encouraging: the SAR-derived currents (specifically, the component of the current in the radial direction along the SAR beam) are qualitatively similar to the equivalent projected radial components deduced from HF measurements and MARS2D output. It must be noted, however, that the HF radar results may be compromised by the presence of island, and the SAR results may be compromised owing to the sensitivity to wind waves.