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基于矩阵算法建立了一个可用于模拟水体非弹性散射过程的水体辐射传输数值模型。该模型采用单个均匀介质层中辐射能量随深度增大而呈指数衰减的假设,将非弹性散射作为源矩阵算子引入到矩阵算法当中进行解算。通过Mobley水体辐射传输标准问题7的验证以及与Hydrolight 5.0结果的比较,说明该模型对多次散射和非弹性散射的处理是正确的,是一个适合于全面模拟水体各种辐射传输过程的数值计算模型。同时在该模型的基础上利用三分量模型,模拟分析了水体各成分对水体非弹性散射的影响以及非弹性散射在遥感反射率中所占的比重。分析结果表明拉曼散射只在清洁水体中对遥感反射率的贡献较大。而随着水体中黄色物质浓度和叶绿素浓度的提高,相应波段的遥感反射率中非弹性散射所占的比重不断提高,但是叶绿素和黄色物质彼此之间却是相互抑制对方的非弹性散射作用。另外悬浮泥沙对非弹性散射作用的削弱非常明显,在高浓度悬浮泥沙水体中非弹性散射过程甚至可以忽略。
Based on the matrix algorithm, a numerical model of water body radiation transmission that can be used to simulate the inelastic scattering process of water bodies is established. The model uses the assumption that the radiant energy in the single homogeneous medium layer increases exponentially with depth. Inelastic scattering is used as the source matrix operator to solve the matrix algorithm. Based on the verification of Mobley radiate standard 7 and the comparison with Hydrolight 5.0, this model is correct for the treatment of multiple scattering and inelastic scattering and is a numerical calculation suitable for the comprehensive simulation of various radiative transfer processes model. Based on the model, the three-component model is used to simulate the influence of water components on the inelastic scattering of water bodies and the proportion of inelastic scattering in remote sensing reflectivity. The results show that Raman scattering only contributes significantly to remote sensing reflectivity in clean water. With the increase of yellow matter concentration and chlorophyll concentration in water body, the proportion of inelastic scattering in remote sensing reflectance of the corresponding band increases continuously, but the interaction of chlorophyll and yellow matter with each other is the inelastic scattering of each other. In addition, the weakening effect of suspended sediment on inelastic scattering is very obvious. The inelastic scattering process in suspended sediment water with high concentration can even be neglected.