巢湖水体散射和后向散射特性研究

湖泊水体散射特性的研究对湖泊水色要素遥感反演模型的发展具有重要的意义.本研究利用AC-S和ECO-BB9实测了巢湖水体的散射系数和后向散射系数,在分析光谱变化特性的基础上,构建了悬浮颗粒物散射系数和后向散射系数的幂函数光谱模型,获得的光谱指数分别为0.86和3.24.研究发现悬浮颗粒物散射系数与TSM和ISM都存在较好的线性函数关系,进而提出水体中总悬浮颗粒物的比散射系数为0.6364(10-3m2·mg-1),无机悬浮颗粒物的比散射系数为0.9108(10-3m2·mg-1).同时,分析了悬浮颗粒物后向散射率和折射指数的变化,其变化范围分别为0.003～0.026和1.02～1.06.

Scattering and Backscattering Characteristics of Lake Chaohu

Lake scattering characteristics are of great significance for remotely-sensed retrieval model development. In this study, scattering and backscattering coefficients of Lake Chaohu were observed through AC-S and ECO-BB9 meters, and their spectral properties were correspondingly analyzed. Then Power function is utilized to model particulate scattering and backscattering spectra, and spectral slope parameters obtained by simulation are 0.86 and 3.24, separately. The proposed scattering and backscattering models present relatively low predicative errors. Particulate scattering coefficients are closely related to TSM and ISM, with corresponding correlative coefficients of 0.91 and 0.94. Their relationships can be simulated well through linear function, and further specific scattering coefficients of TSM and ISM were proposed to be 0.6364 (10^-3 m²·mg^-1) and 0.9108 (10^-3m²·mg^-1). In addition, particulate backscattering ratio in Lake Chaohu has a variation range of 0.003-0.026, and refractive index varies from 1.02 to 1.06, which displays no large variation spans when compared with that in previous studies.