1.School of Ocean Sciences, China University of Geosciences, Beijing 100083, China 2.Qingdao Marine Geosciences Institute, Qingdao 266071, China 3.Key laboratory of Marine Hydrocarbon Resource and Environmental Geology, Qingdao 266071, China 4.School of Instrumention Science and Opt-Electronics Engineering, Beijing University of Aeronautics & Astronautics, Beijing 100101, China 5.South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China 6.College of Geography Science, Southwest University, Chongqing 400715, China
Abstract：The complicated compositions of Case Ⅱ waters result in the complex properties of spectral curves.The present paper analyzed the in situ measurements data of spectral curves, and further realized the relationships between the properties of spectral curves and suspended sediment concentration.The study found that the max peak of spectral curves was moving to the direction of shortwavelength as increasing suspended sediment concentration, namely the blue shift of wavelength; the area enclosed by spectral curve and coordinate axis in the range of sensitive bands had preferably linear relationship with the suspended sediment concentration (curve area model); the trapezoidal area model which was an approximation of curve area model could also excellently reflect those relationships, and be greatly suitable for multi-spectral satellite imagery retrieval such as LandSat/TM, MODIS and so on.The inversion results of trapezoidal area model for LandSat/TM imagery on October 27, 2003 in Taihu Lake showed that the suspended sediment concentration ranged from 30 to 80 mg·L-1, the distribution pattern was higher in the west, south and central lake and lower in the east lake; compared with the in situ measurements in the regions, and the relative error of retrieval model was 6.035%.
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