大流域尺度下水体叶绿素a高分辨率遥感调查  

High-resolution Remote Sensing of Chlorophyll-a Across Large Basins

作　　者：梁钰婕 邓孺孺[1,2,3,4] 梁业恒 汤玉明[1] 熊龙海 李嘉怡 LIANG Yujie;DENG Ruru;LIANG Yeheng;TANG Yuming;XIONG Longhai;LI Jiayi(School of Geography and Planning,Sun Yat-sen University,Guangzhou 510000,China;Guangdong Engineering Research Center of Water Environment Remote Sensing Monitoring,Guangzhou 510000,China;Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai),Zhuhai 519000,China;Guangdong Provincial Key Laboratory of Urbanization and Geo-simulation,School of Geography and Planning,Guangzhou 510000,China;The Pearl River Hydraulic Research Institute,Guangzhou 510000,China)

机构地区：[1]中山大学地理科学与规划学院,广东广州510000 [2]广东省水环境遥感监测工程技术研究中心,广东广州510000 [3]南方海洋科学与工程广东省实验室(珠海),广东珠海519000 [4]广东省城市化与地理环境空间模拟重点实验室,广东广州510000 [5]珠江水利委员会珠江水利科学研究院,广东广州510000

出　　处：《遥感技术与应用》2024年第6期1490-1499,共10页Remote Sensing Technology and Application

基　　金：国家自然科学基金项目(41901352、41071230);广东省省级科技计划项目(2017B020216001);广东省基础与应用基础研究基金(2020A1515010780);广东省基础与应用基础研究基金项目(2022B1515130001);广州市科技计划项目(202102020454)。

摘　　要：内陆水体光学特性复杂多变。为提高遥感技术对内陆水域叶绿素a含量监测的准确性和可靠性,本研究基于辐射传输机理,分析水中杂质对水体光路传输过程的影响,结合Deng模型建模方法构建叶绿素a浓度遥感反演模型,并利用Sentinel-2A卫星影像实现针对广东省东江中下游的河、湖、库的叶绿素a浓度遥感反演。通过同步水质采样化验对遥感反演结果进行验证,结果表明该模型适用性良好,平均绝对误差为2.67μg/L,平均相对误差为13.67%,相关系数为82.7%。从反演结果可看出,叶绿素浓度较高的水体主要集中分布于农业和工业聚集的中游干流部分河段、湖库库湾以及相关出入库支流处,对受污染河段进行调查分析,中游河段污染源多为点源,支流多为面源,受污染库湾水体则受到生态内源和人工外源共同作用。The optical properties of inland water bodies are complex and variable.To improve the accuracy and reliability of remote sensing technology in monitoring chlorophyll-a concentrations in inland waters,this study analyzes the impact of water on the optical path transmission process based on the radiative transfer theory.By integrating the Deng model modeling method,a remote sensing inversion model for chlorophyll-a concentration is constructed.Sentinel-2A satellite images are used to achieve remote sensing for chlorophyll-a concentration in rivers,lakes,and reservoirs in the middle and lower reaches of the Dongjiang River.The accuracy of the remote sensing results is verified through synchronous water quality sampling and laboratory analysis.The constructed radiative transfer model has good applicability,with an average absolute error of 2.67μg/L,an average relative error of 13.67%,and a correlation coefficient of up to 82.7%.The inversion results show that water bodies with high chlorophyll concentration are mainly concentrated in the middle reaches of the main stream of the river,in the bays of lakes and reservoirs where agriculture and industry are concentrated,as well as in the inflows and outflows of reservoirs.Through investigating and analyzing the polluted river sections,it is found that the pollution sources in the middle reaches of the river are mainly point sources,while the pollution sources in the tributaries are mainly diffuse sources.The polluted water bodies in the reservoirs are affected by both endogenous ecological factors and exogenous artificial factors.

关 键 词：东江中下游 叶绿素A浓度 遥感反演 辐射传输模型 Sentinel-2A 

分 类 号：X832[环境科学与工程—环境工程] X87