THE RETRIEVAL MODEL FOR ORGANIC CONTAMINATION IN WATERS USING OPTICAL ABSORPTION PROPERTIES OF CDOM

摘要

Yellow Substances (also chromophoric dissolved organic matter: CDOM) is the pool of absorbing substance in water. In the fields of water colour remote sensing, its optical absorption properties are mainly described with absorption coefficient and spectral slope. It has showed by present research that the influence of organic contamination in water including petroleum pollutant and COD (Chemical Oxygen Demand) on spectral absorption coefficient is mainly represented on absorption spectral features of yellow substance. The experimental data in-situ is obtained at the regions of Panjin city, Liaoning province of China in May 2008, August 2009 and June 2010. With the measurement data, first, the exponential spectral slope (S) was determined; Secondly, the model of retrieval a_g (440) based on the HJ-1 satellite was created; Thirdly, the remote sensing model to retrieve organic contamination in water including petroleum pollutant and COD were established, then the validation was done; Finally, the models of retrieving organic contamination from HJ-1 satellite were applied in the region of Liaodong bay.