Chemical Oxygen Demand (COD) concentrations in East Dongting Lake (East DTL) were retrieved from multi-temporal TM images. Retrieval results showed that the East DTL was in case II waters in the past several years. Furthermore, COD concentration near the coast is higher than in deep waterway, for the water flows much more rapidly in deep waterway than near the coast. The annual changes of the COD concentration in East DTL increased significantly from 1993 to 1999, but the change from 1999 to 2006 in extremely dry seasons is very small. The retrieval results from remote sensing data compared with in-situ data showed that the empirical and semi-empirical models have high precision in retrieving water quality parameters of a certain range.
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Yang et al. (2011) studied this question.
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