遥感监测水体叶绿素含量是水质遥感研究的难点之一。本文通过研究不同叶绿素含量水体反射率的光谱特征，确定了提取叶绿素a含量的最佳特征波段，建立了太湖水体叶绿素a的混合光谱模型。研究发现，混合光谱模型提取的水体叶绿素a百分比浓度与同步采样分析的叶绿素a浓度之间有较好的线性相关性。并基于TM和HEPERION图像利用此模型生成了叶绿索a浓度分布图。研究结果表明，混合光谱分解模型可以作为遥感监测水体叶绿素a含量的定量模型。

Remote sensing(RS) data can be used to estmi ate the chlorophyll-a concentration ofwater body,\nwhich has become a key issue ofwater qualitymonitoring. In this paper the field water reflectance spectra have\nbeen applied formonitoring thewaterquality ofTaihu Lake according to reflectance spectra ofwatervaryingwith\nconcentrations oforganic and inorganic sedmi ents. After analyzing the spectra characterwe selected the optmi al\nband range(670—710nm), and retrieved the chlorophyll-a concentration by linear spectralunmixingmodelusing\nknownwater and chlorophyll-a endmember spectra of in situ-water samples. TM and HEPERION mi age was\nprocessed and the distribution of chlorophyll-a concentration was retrieved by linear spectral unmixingmethod.\nThe result shows that a fine linear correlation exists between the abundance of chlorophyll-a from the spectral\nunmixingmodel and the concentration of chlorophyll-a from the analytical result in the laboratory, and also shows\nthat spectralunmxingmodel is a feasiblemodel in the practical application forwater qualitymonitoring.