基于辐射传输模型的巢湖叶绿素a浓度反演  

Retrieval of chlorophyll-a concentration in Chaohu based on radiative transfer model

作　　者：刘文雅 邓孺孺[1,2,3] 梁业恒 吴仪[1] 刘永明[1] LIU Wenya;DENG Ruru;LIANG Yeheng;WU Yi;LIU Yongming(School of Geographic Science and Planning,Sun Yat-Sen University,Guangzhou 510275,China;Guangdong Engineering Research Center of Water Environment Remote Sensing Monitoring,Guangzhou 510275,China;Guangdong Provincial Key Laboratory of Urbanization and Geo-Simulation,Guangzhou 510275,China)

机构地区：[1]中山大学地理科学与规划学院,广州510275 [2]广东省水环境遥感监测工程技术研究中心,广州510275 [3]广东省城市化与地理环境空间模拟重点实验室,广州510275

出　　处：《国土资源遥感》2019年第2期102-110,共9页Remote Sensing for Land & Resources

基　　金：中国博士后科学基金资助项目“基于高光谱影像的自然水体重金属铁和铜遥感反演研究”(编号:2017M612792);广东省省级科技计划项目“珠江三角洲大气污染高分遥感监测及预警”(编号:2017B020216001);广东省水利科技创新项目“广东省中小河流水量水质水生态联合监测技术体系研究”(编号:2016-08);广东省自然科学基金项目“内陆光学浅水遥感模型及其在流溪河流域水质遥感监测的应用”(编号:2017A030313238);中山大学青年教师培育项目“内陆有机污染光学浅水模型及水质、水深、底质一体化遥感反演研究”(编号:17lgpy41)共同资助

摘　　要：应用局限性小、普适性强的叶绿素a浓度反演算法是提高定量遥感技术实用性的关键。基于辐射传输机理,分析内陆湖中叶绿素a等因子的光学特性,建立像元反射率与因子浓度的物理模型。应用模型同时反演巢湖不同时相的叶绿素a浓度,决定系数R2可达0.8778,证明了模型时相局限性小、普适性强。进而选取预处理后的2016年巢湖不同时相Landsat8影像,反演并分析巢湖叶绿素a浓度的时空分布特征。研究表明,该模型不受时相限制、普适性强,可推动定量遥感技术在水质污染研究方面的应用。The algorithm of chlorophyll-a concentration inversion with higher universality is the key to improving the practicability of quantitative remote sensing technology.Based on the radioactive transfer mechanism,the optical characteristics of chlorophyll-a and other factors in inland lakes are analyzed,and a physical model of pixel reflectivity and factor concentration is established.The model was applied to the remote sensing data of different phases in Chaohu.The determination coefficient was 0.877 8 and the average relative error was only 11.61%.This proved that the precision of the model was higher and the universality was stronger.Then,the preprocessed Chaohu remote sensing image was applied to the model,and the spatial and temporal distribution characteristics of eutrophic pollution in Chaohu were obtained,which is consistent with the regulation of the seasonal multiplication of algae.The model used in this study has high accuracy and universality and thus can promote the application of quantitative remote sensing technology in water pollution research.

关 键 词：叶绿素A浓度 Landsat8 辐射传输 巢湖 吸收 散射 

分 类 号：TP79[自动化与计算机技术—检测技术与自动化装置]