广州流溪河水库叶绿素a遥感反演研究

叶绿素a是衡量水体初级生产力和富营养化程度的一项重要指标。本研究在讨论分析反演水体叶绿素a浓度的半分析生物光学模型理论基础上,利用Landsat TM数据及中巴资源卫星02星CCD相机高分辨率数据,结合实测数据建立广州流溪河水库叶绿素a浓度的波段比值型反演模型。该模型对两个不同监测日期的叶绿素a浓度反演效果较好,拟合系数(R2)分别达到0.860和0.715,均方根误差分别为0.102μg/L和0.198μg/L。反演结果表明,流溪河水库叶绿素a浓度整体较低,均在2.0μg/L以下,空间分布在湖库区较均匀,入库支流玉溪河水域叶绿素a浓度略高于湖库区。

Chlorophyll a Concentration Retrieval of Liuxihe Reservoir in Guangzhou Using Remote Sensing Data

Chlorophyll a is a key water quality parameter indicating the level of primary productivity and eutrophication in water.Based on the semi-analytical bio-optical retrieval model of chlorophyll a concentrations in inland water,a two-band ratio model was established for accurate estimation of chlorophyll a concentration,in Liuxihe reservoir,Guangzhou,correlating Landsat TM data and CBERS-02B CCD data,and field measured chlorophyll a concentration.The models performed well for retrieval of chlorophyll a of the two days,with high determination coefficients（R2） 0.860 and 0.715 respectively;and root-mean-square error respectively 0.102ug/ L and 0.198ug/L.It shows that chlorophyll a concentration in the Liuxihe reservoir is mostly lower than 2.0ug/L,and the spatial distribution of chlorophyll a in the main reservoir is almost uniform,and chlorophyll a concentration of Yuxi River is little higher than the main reservoir.