基于辐射传输过程的水质遥感模型及其在珠江口的应用

Remote Sensing Model of Water Quality Based on Radiation Transmission Process and Its Application in Pearl River

根据入射光在水体中的辐射传输过程以及水分子、悬浮泥沙和污染物等的散射、吸收对传输过程的影响,建立了水质遥感模型。该模型具有清晰的物理意义,较经验和半经验模型具有适用性强,可行性高的优点。采用Landsat8卫星数据,运用该模型对珠江口水域进行了水质定量分析,先对影像进行预处理,包括辐射定标、太阳天顶角纠正和大气校正,继而进行水陆分离,最后选取OLI 3和OLI 4两个波段计算了污染物和悬浮泥沙的浓度,结果与所掌握的珠江口污染物和悬浮泥沙分布的实际情况基本相符,证明利用该模型进行水质定量分析是可行的。

According to the radiation transmission process of incident light in water and the influence of scattering and absorption of water molecules,suspended sediment and pollutants on the transmission process,a remote sensing model of water quality is established.The model has clear physical meaning and has the advantages of strong applicability and high feasibility than empirical and semi-empirical models.In this paper,Landsat8 satellite data is used to quantitatively analyze the water quality of the waters of the Pearl River estuary.The image is preprocessed,including radiometric calibration,solar zenith angle correction and atmospheric correction,and then water and land separation.Finally,OLI3 and OLI4 are selected to calculate the concentration of pollutants and suspended sediment.The results are basically consistent with the actual situation of the distribution of pollutants and suspended sediment in the Pearl River estuary,and it is proved that it is feasible to use this model for quantitative analysis of water quality.