Estimation of suspended sediment concentration based on bio-optical mechanism and HJ-1 image in Chaohu Lake  

作　　者：WANG Qiao1,2,JIN Xin2,LI YunMei2,WU ChuanQing1,Lü Heng2,WANG YanFei2,ZHANG Hong2,YIN Bin2 & ZHU Li1 1Satellite Environment Center,Ministry of Environmental Protection,Beijing 100029,China 2Key Laboratory of Virtual Geographic Environment of Education Ministry,Nanjing Normal University,Nanjing 210046,China 

出　　处：《Science China Earth Sciences》2010年第S1期58-66,共9页中国科学（地球科学英文版）

基　　金：supported by National Key Project of China (Grant No.2009ZX07527-6);National Key Technology R&D Program of China (Grant No.2008BAC34B05);National Natural Science Foundation of China (Grant No.40971215)

摘　　要：Synchronization experiment was conducted in June,2009 to get Inherent Optical Properties(IOP) of water component in Chaohu Lake.Water bio-optical mechanism was studied combined with multispectral data of Environmental Satellite 1(CCD),and then inversion models of total suspended matter(TSM),inorganic suspended matter(ISM) and organic suspended matter(OSM) concentration were built.The data indicated that:the absorption ratio of suspended particulate matter and CDOM to total were almost no change from band 1 to band 2 with about 85% and 9%,respectively.The ratio of pure water to total increased from 0.4% to 5.6%.Water reflectance in these two bands were influenced by absorption of three kinds of components:algae particles absorption surpassed non-algal particles in band 3,and so played an important role in total absorption with about 35.7%;the proportion of pure water absorption and particles matter backscattering both were 99% in band 4,so these two components decided the main inherent optical properties in band 4.The models of TSM and ISM concentration inversion based on band combination(band 3 + band 4)/(band 1 + band 2) were built,while OSM concentration was estimated by band 4/(band 1 + band 2) index.Inversed by image data,RE of TSM concentration between modeled and measured was 33.4%,and RMSE was 18.68 mg/L.RE of ISM and OSM concentration were 39.9% and 35.2% respectively.The inversion was more accurate when satellite-ground data were just in the same day.At this situation,RE of ISM concentration dropped to 25.4%,and that of TSM and OSM reduced to 26.5% and 26.8% as well.Synchronization experiment was conducted in June,2009 to get Inherent Optical Properties(IOP) of water component in Chaohu Lake.Water bio-optical mechanism was studied combined with multispectral data of Environmental Satellite 1(CCD),and then inversion models of total suspended matter(TSM),inorganic suspended matter(ISM) and organic suspended matter(OSM) concentration were built.The data indicated that:the absorption ratio of suspended particulate matter and CDOM to total were almost no change from band 1 to band 2 with about 85% and 9%,respectively.The ratio of pure water to total increased from 0.4% to 5.6%.Water reflectance in these two bands were influenced by absorption of three kinds of components:algae particles absorption surpassed non-algal particles in band 3,and so played an important role in total absorption with about 35.7%;the proportion of pure water absorption and particles matter backscattering both were 99% in band 4,so these two components decided the main inherent optical properties in band 4.The models of TSM and ISM concentration inversion based on band combination(band 3 + band 4)/(band 1 + band 2) were built,while OSM concentration was estimated by band 4/(band 1 + band 2) index.Inversed by image data,RE of TSM concentration between modeled and measured was 33.4%,and RMSE was 18.68 mg/L.RE of ISM and OSM concentration were 39.9% and 35.2% respectively.The inversion was more accurate when satellite-ground data were just in the same day.At this situation,RE of ISM concentration dropped to 25.4%,and that of TSM and OSM reduced to 26.5% and 26.8% as well.

关 键 词：HJ-1 Satellite bio-optical property CHAOHU LAKE suspended MATTER 

分 类 号：X832[环境科学与工程—环境工程]