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Evaluation of fuzzy synthesis to assess the seawater eutrophication in the Changjiang estuary

Mingyuan Chen

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Abstract

Based on seasonal data for 2004, COD, DIN, phosphate,Chl-a, and DO were chosen to be the assessment parameters, and fuzzy synthesis evaluation is applied to assessing the eutrophication levels in the Changjiang estuary. The result showed that about half the sampling sites are at the stage of eutrophication.The outlets and the dilution zone of the Changjiang river(on the west of 122.5°E) are characterized as eutrophication. The off-sea of the Changjiang estuary(on the east of 122.5°E) is at the oligotrophic stage. The eutrophication levels are gradually increasing from off-sea to offshore. Most of all the areas charactered as eutrophication are located at the areas below salinity 20. The obvious seasonal and regional variabilities showed that, the eutrophication levels of this area are dominated by the diluted water in the Changjiang River.

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What this paper is about

Based on seasonal data for 2004, COD, DIN, phosphate,Chl-a, and DO were chosen to be the assessment parameters, and fuzzy synthesis evaluation is applied to assessing the eutrophication levels in the Changjiang estuary. The result showed that about half the sampling sites are at the stage of eutrophication.The outlets and the dilution zone of the Changjiang river(on the west of 122.5°E) are characterized as eutrophication. The off-sea of the Changjiang estuary(on the east of 122.5°E) is at the oligotrophic stage. The eutrophication levels are gradually increasing from off-sea to offshore. Most of all the areas charactered as eutrophication are located at the areas below salinity 20. The obvious seasonal and regional variabilities showed that, the eutrophication levels of this area are dominated by the diluted water in the Changjiang River.

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Available abstract

Based on seasonal data for 2004, COD, DIN, phosphate,Chl-a, and DO were chosen to be the assessment parameters, and fuzzy synthesis evaluation is applied to assessing the eutrophication levels in the Changjiang estuary. The result showed that about half the sampling sites are at the stage of eutrophication.The outlets and the dilution zone of the Changjiang river(on the west of 122.5°E) are characterized as eutrophication. The off-sea of the Changjiang estuary(on the east of 122.5°E) is at the oligotrophic stage. The eutrophication levels are gradually increasing from off-sea to offshore. Most of all the areas charactered as eutrophication are located at the areas below salinity 20. The obvious seasonal and regional variabilities showed that, the eutrophication levels of this area are dominated by the diluted water in the Changjiang River.

Key concepts: Eutrophication, Estuary, Environmental science, Salinity, Seawater, Oceanography, Hydrology (agriculture), Stage (stratigraphy)

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