研究水表薄油膜厚度与其反射率光谱之间的变化规律, 对于分析海洋油膜污染和油气勘探的遥感探测机理具有十分重要的意义。 建立了水面薄油膜厚度的生物光学模型, 并介绍了单波段和双波段比值简化算法反演薄油膜厚度信息的方法。 通过对原油样品进行油膜厚度定量反演, 研究了遥感反射率随水表油膜厚度的变化规律。 研究发现, 可见光到近红外波段(450~800 nm)反射率对油膜厚度变化最为敏感, 有很高的负相关关系, 并且随着油膜厚度的增加呈负指数形态下降。 对于浅水环境较混浊的水体, ETM1/ETM3双波段比值模型可以较好的消除线性天空散射光的影响, 克服单波段反演模型在不同水质背景下反演效果不稳定的特点, 其反演结果的复相关系数R2可以达到0.98, 是水表薄油膜厚度遥感探测的较好波段选择。

Study on the regularity of thin oil film thickness and its reflectance plays an important role in understanding the mechanism of offshore oil slick and ocean hydrocarbon resources exploration. In this work, the thin oil film thickness of biological optical model is established, and introduced the simplified model of inversion thin oil film thickness information by using one single-band or by using two-band ratio image data. With the quantitative inversion test of thin oil film thickness through the natural shallow water and the crude oil sample, the variation rules of between oil spectral parameters and the thin oil film thickness are obtained. The study show that, the oil reflectance in visible and near infrared spectrum (450~800 nm) and the thin film thickness has high inverse correlation, and showed as negative exponent form decline with the increase of oil film thickness. Regarding the shallow water environment, the double band ratio inversion model of using ETM1/ETM3 band ratio can used to be eliminate the impact of sky scattering influence, and to overcome the single-band model fault of Inversion instability when used in different water quality regions, as the inversion result of the model’s correlation coefficient can reach 0.98, which is considered to be the ideal hydrocarbon content remote sensing surveying band. and combined with other types of remote sensing technology(such as ultraviolet-laser or SAR), it would provide more economic and precision services of oil total amount infromation for offshore oil exploration and oil spill monitoring.