A comparison of visual observations of surface oil with Synthetic Aperture Radar imagery of the Sea Empress oil spill
A comparison of visual observations of surface oil with Synthetic Aperture Radar imagery of the Sea Empress oil spill
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DOI：
10.1080/713861238
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发表时间：
2001-06-15
影响因子：
3.4
通讯作者：
Jones, B
中科院分区：
文献类型：
--
作者：
Jones, B
对表面石油的目视观测与1996年2月Sea Empress漏油事件期间拍摄的四幅星载合成孔径雷达图像进行了比较。虽然合成孔径雷达的基本浮油成像能力已有详细记载，但要在发生重大漏油时使用，图像必须能够提供关于石油厚度的信息。该分析表明，在某些环境条件下，这是可能的。识别重表面油的最佳风速约为5-6 m s（-1）。在这种风速下，轻和中等光泽在图像中不明显，并且由于重光泽和厚棕色/黑色油而导致的反向散射减少之间存在区别。在更高的风速下，即使是厚厚的浮油也很容易混入水柱，其SAR特征也会减弱。在微风条件下，模式识别对油膜的识别非常重要。图像是更敏感的光泽内米尔福德港港的庇护沃茨比在开放的沿海沃茨的存在，表明光泽的可见度在卫星上的SAR和海洋状态之间可能存在的关系。
A comparison has been made between the visual observations of surface oil and four satellite-borne Synthetic Aperture Radar (SAR) images taken during the Sea Empress oil spill in February 1996. Whilst the basic oil slick imaging capabilities of SAR are well documented, to be of use at the time of a major oil spill, the imagery must be able to provide information on the thickness of oil. This analysis suggests that, under certain environmental conditions, this is possible. The optimum wind speed for the identification of heavy surface oil is around 5-6 m s(-1). At this wind speed, light and medium sheen is not evident in the imagery and there is a distinction between the backscatter reductions due to heavy sheen and thick brown/black oil. At higher wind speeds, even thick oil slicks readily mix into the water column and their SAR signature weakens. In light winds, pattern recognition is very important to the identification of oil slicks. The images are more sensitive to the presence of sheen within the sheltered waters of Milford Haven than in the open coastal waters, indicating a possible relationship between sheen visibility in satellite-borne SAR and sea state.