【摘要】 水体中各组分对光谱的吸收和散射构成了水体的固有光学特性,是生物光学模型的重要参数,是建立水质遥感半分析模型的基础.目前该方法多应用于湖泊水质监测,很少用于河流.因此,本研究以福建晋江下游河段为例,探讨水面下反射率R(0-)与光学活性物质之间的关系,并建立了光学活性物质的估算模型.结果表明,利用R(0-)753与总悬浮物浓度、R(0-)702/R(0-)680与浮游植物色素浓度、R(0-)670/R(0-)423与CDOM吸收系数分别建立的估算模型能取得理想的效果,其决定系数分别是0.953、0.820 5和0.621 3,对应的相对误差分别是6.1%、21.87%和22.18%.三者中以悬浮物浓度的反演精度最高,然后依次为浮游植物色素浓度和CDOM.主要原因在于浮游植物色素的浓度相对较低,光谱信号较弱;CDOM的特征光谱波段很窄,而且该波段内的R(0-)受到其它2种物质存在的影响.更多还原

【Abstract】 The water’s Inherent Optical Properties（IOPs）,including absorption and scattering coefficients of water components,are the essential parameters for bio-optical model and retrieval of water quality using the semi-analytical method.Nevertheless,the application of the bio-optical model in river water studies is still very rare.Therefore,taking the lower Jinjiang River of Fujian,SE China as an example,this study measured and calculated the bio-optical properties of river water and concentrations of optically active substances based on in situ water samples collected from river in 2007.It shows that(R（0^-）₇₅₃),(R（0^-）₇₀₂)/(R（0^-）₆₈₀) and(R（0^-）₆₇₀)/(R（0^-）₄₂₃) can be used to estimate total suspended solids（TSS） concentration,phytoplankton pigment（PP） concentration and the CDOM absorption at 440nm,respectively.The determination coefficients（R²） of the retrieval model of TSS,PP and CDOM are 0.953,（0.820?5） and（0.621?3,） respectively.The corresponding relative errors of the models（RE） are 6.1%,21.87% and 22.18%.The results show that the model for estimating TSS can achieve the highest accuracy,the PP-estimating model has the second highest accuracy and the CDOM-estimating model has the lowest.The relatively lower concentration of phytoplankton pigments,narrow characterized spectral range of CDOM and influence of CDOM’s（R（0^-）） by TSS and PP within this spectral range contributed to their relatively lower accuracy.更多还原