Study on the hyperspectral polarized reflection characteristics of oil slicks on sea surfaces  

作　　者：SUN ZhongQiu ZHAO YunSheng YAN GuoQian LI ShaoPing 

机构地区：[1]College of Urban and Environmental Sciences, Northeast Normal University, Changchun 130024, China

出　　处：《Chinese Science Bulletin》2011年第15期1596-1602,共7页

基　　金：supported by the National Basic Research Program of China (2009CB426305);National Natural Science Foundation of China (40971190,40771153);Nurturing Project of Scientific and Technological Innovation Platform,Northeast Normal University (106111065202)

摘　　要：This study is concerned with the need for remote sensing techniques for the monitoring of oil-slick pollution on sea surfaces and the effects of oil-slick pollution on the sea.We used Daqing crude oil,Jilin crude oil,heavy oil and seawater from Dalian Bay to simulate oil-slick pollution on the sea surface and obtained multi-angle hyperspectral polarized reflectance information,from which we calculated the polarization for different kinds of crude oil,and oil-slicks of different thicknesses.By comparing the degree of polarization between oil-slicks of different thickness,and sea water,it was found that in the case of thin oil-slicks,the degree of polarization of seawater is higher than that of oil slicks with wavelengths of between 400-1000 nm.However,there was little difference at a wavelength of 785 nm.At angles of incident of 20° and 30° (the viewing angle equals the incident angle),it was easy to distinguish the changes of oil-slick thickness by the degree of polarization at 785 and 880 nm in the near-infrared band.The crude oil showed its inherent polarized characteristic as the oil-slick thickness increased to a certain degree.That is to say,the polarization of the seawater was higher than that of the oil-slick in the visible light range,but less than that in the near-infrared band.As the incident angle changed from 40° to 50°,the degree of polarization of seawater increased,and it was higher than that for the oil-sick between wavelengths of 400-1000 nm at an angle of incidence of 50°.This research on the polarized characteristics of an oil-slick on a sea surface brings new scientific techniques to the monitoring of sea-surface pollution by remote sensing.This study is concerned with the need for remote sensing techniques for the monitoring of oil-slick pollution on sea surfaces and the effects of oil-slick pollution on the sea. We used Daqing crude oil, Jilin crude oil, heavy oil and seawater from Dalian Bay to simulate oil-slick pollution on the sea surface and obtained multi-angle hyperspectral polarized reflectance information, from which we calculated the polarization for different kinds of crude oil, and oil-slicks of different thicknesses. By comparing the degree of polarization between oil-slicks of different thickness, and sea water, it was found that in the case of thin oil-slicks, the degree of polarization of seawater is higher than that of oil slicks with wavelengths of between 400-1000 nm. However, there was little difference at a wavelength of 785 nm. At angles of incident of 20~ and 30~ （the viewing angle equals the incident angle）, it was easy to distinguish the changes of oil-slick thickness by the degree of polarization at 785 and 880 nm in the near-infrared band. The crude oil showed its inherent polarized characteristic as the oil-slick thickness increased to a certain degree. That is to say, the polarization of the seawater was higher than that of the oil-slick in the visible light range, but less than that in the near-infrared band. As the incident angle changed from 40°to 50°, the degree of polarization of seawater increased, and it was higher than that for the oil-sick between wavelengths of 400-1000 nm at an angle of incidence of 50°. This research on the polarized characteristics of an oil-slick on a sea surface brings new scientific techniques to the monitoring of sea-surface pollution by remote sensing.

关 键 词：偏振反射 海洋表面 高光谱 浮油 反射特性 近红外波段 大庆原油 遥感技术 

分 类 号：X55[环境科学与工程—环境工程] P237[天文地球—摄影测量与遥感]