Environmental Research Institute, UHI-NHC, Thurso, Scotland, UK.
Environmental Research Institute, UHI-NHC, Thurso, Scotland, UK.
Mar Pollut Bull. 2018 Oct;135:1145-1157. doi: 10.1016/j.marpolbul.2018.08.044. Epub 2018 Sep 1.
Remote sensing of plastic littering natural waters is an emerging field of science with the potential to provide observations on local to global scales. We present the verification of a theoretical reflectance model of sunlight interacting with a water surface littered with buoyant plastic objects. We measured a few common litter items of different polymers as well as shapes, transparencies, and surface roughnesses. Spectral reflectance measurements in the field were backed up with measurements in the laboratory of coefficients of total and diffuse reflectance, transmittance and absorption. We evaluated a single-band algorithm for 850 nm wavelength and a dual-band algorithm using a second wavelength at a polymer absorption band between 1660 and 1730 nm. Both algorithms were plastic litter type specific. Our findings show that for interpreting spectral remote sensing of floating plastic, physical properties that control geometrical optics should complement information about the absorption spectra of the polymer.
自然水域中塑料垃圾的遥感是一个新兴的科学领域，具有提供局部到全球范围观测的潜力。我们验证了一个阳光与漂浮在水面上的塑料物体相互作用的理论反射率模型。我们测量了几种不同聚合物的常见垃圾物品，以及它们的形状、透明度和表面粗糙度。现场的光谱反射率测量得到了实验室中总反射率和漫反射率、透射率和吸收率系数测量的支持。我们评估了一个 850nm 波长的单波段算法和一个使用 1660nm 到 1730nm 之间聚合物吸收带的双波段算法。这两个算法都是特定于塑料垃圾类型的。我们的研究结果表明，对于解释漂浮塑料的光谱遥感，控制几何光学的物理性质应该补充聚合物吸收光谱的信息。
