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《Environmental Science》 2009-04
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Estimation of the Optically Active Substances in Case Ⅱ Water of the Lower Jinjiang River Based on the Bio-optical Model

LI Wan-hui,XU Han-qiu(College of Environment and Resources,Fuzhou University,Fuzhou 350108,China)  
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(R~2) 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.
【Fund】: 福建省重大专项前期研究项目(2005YZ1011)
【CateGory Index】: X832
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