• 关键词：悬浮物  吸收系数  后向散射系数  水面下反射率

• 基金项目：福建省重大专项前期研究项目(No.2005YZ1011)

• 李婉晖
• 福州大学环境与资源学院, 福州 350108

• 徐涵秋
• 福州大学环境与资源学院, 福州 350108

• 摘要：为了建立以生物光学模型为基础的河流悬浮物遥感估算方法,以福建晋江为例,对福建晋江下游河段的光学特性和悬浮物浓度进行了测定,探讨了水面下反射率R(0^-)与悬浮物浓度之间的响应关系.结果表明,绿光波长的反射率与悬浮物浓度的相关性最强,因此,用R(0^-)_TM2与悬浮物浓度建立了遥感估算模型,并将其应用于2008年2月28日的LandsatTM影像,反演出晋江的悬浮物浓度分布.精度分析说明,平均相对误差RE为11.93%,该模型可以有效地应用于LandsatTM反演悬浮物浓度.

• Abstract：Water's Inherent Optical Properties(IOPs),including the absorption and scattering coefficients of the water components,are essential parameters for a bio-optical model.It is also important for the retrieval of water quality using the semi-analytical method.Nevertheless,the application of bio-optical models in river water studies is still very rare.Therefore,taking the lower Jin River of Fujian,SE China as an example,we measured and computed the bio-optical properties and the suspended solids concentrations of the river water based on in situ water samples collected from the river on March 5,2008.This revealed that R(0^-)_TM2 was most strongly correlated with suspended solids concentrations.Accordingly,a retrieval model for estimating SSwas developed using R(0^-)_TM2.Application of this bio-optical model to the Landsat TMimage dated on Feb.28,2008 yielded a SSmodel for the TMdata of the Jin River.The Relative Error(RE)of the model is 11.93%.This result indicates that the model can effectively retrieve the SS of the Jin River.

• Key words：uspended solids  absorption coefficient  backscattering coefficient  sub-surface irradiance reflectance

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