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MODIS pigment concentration estimation-based eutrophicated lake water quality risk assessment method

A technology of pigment concentration and eutrophication, which is applied in the direction of calculation, testing water, computer parts, etc., can solve problems such as the inability to fully reflect the changes in water quality.

Active Publication Date: 2017-02-15
NANJING INST OF GEOGRAPHY & LIMNOLOGY
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Problems solved by technology

However, the concentration of pigment alone cannot fully reflect the changes in water quality.

Method used

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  • MODIS pigment concentration estimation-based eutrophicated lake water quality risk assessment method
  • MODIS pigment concentration estimation-based eutrophicated lake water quality risk assessment method
  • MODIS pigment concentration estimation-based eutrophicated lake water quality risk assessment method

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[0067] The technical solution of the present invention is described in further detail below through specific examples, but it is necessary to point out that the following experiments are only used to describe the content of the invention, and do not constitute limitations to the protection scope of the present invention.

[0068] The present invention carries out water quality risk assessment of eutrophic lakes based on the MODIS pigment concentration estimation product, and the above-mentioned purpose is achieved in this way: based on the estimation results of MODIS chlorophyll a and phycocyanin, calculate the PC:Chla ratio; combine chlorophyll a and PC:Chla Ratio results, obtained water quality evaluation model, and examples of water quality risk assessment results; based on MODIS data from 2000 to 2014, obtained long-term water quality evaluation results of eutrophic water bodies, and calculated interannual and intermonthly changes in water quality risk levels.

[0069] Embo...

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Abstract

The invention discloses an MODIS pigment concentration estimation-based eutrophicated lake water quality risk assessment method. The method includes the following steps that: MODIS images are classified into algae bloom images and non-algae bloom images, an EOF algorithm is adopted to estimate the concentration of chlorophyll a and the concentration of phycocyanobilin, and the ratio of the PC(phycocyanobilin) to the Chla(chlorophyll a) is calculated according to the estimation results of the chlorophyll a and the phycocyanobilin; a water quality assessment model is obtained based on the chlorophyll a and the ratio of the PC to the Chla, and the result of water quality risk assessment is given; and an eutrophicated lake water quality long-time sequence assessment result can be obtained based on historically-obtained MODIS data, the interannual and inter-monthly variation laws of water quality risk degree are calculated. With the method of the invention adopted, eutrophicated lake water quality risk degree can be obtained, which makes it possible to apply a remote sensing method to study the change of water quality in Chaohu Lake, facilitates assessment on ecological risks caused by algae blossom, and provides science and technology support for departments such as water conservancy and environmental protection departments, in scientific decision-making in water resource protection.

Description

technical field [0001] The invention relates to a risk assessment method for eutrophic lake water quality based on MODIS pigment concentration estimation. Background technique [0002] Lakes are the most important freshwater resources. They have multiple functions such as providing drinking water sources, regulating climate, maintaining ecological diversity, regulating storage and tourism, and are closely related to social development, people's production and life in the basin area. Chaohu Lake, the fifth largest freshwater lake in China, is located in Anhui Province in the middle and lower reaches of the Yangtze River. It is the main source of drinking water for Hefei and Chaohu City with a population of more than 1 million in the basin, and plays an important role in the production and life of local people. However, in recent years, with the rapid economic development of the Chaohu Lake Basin, especially the upstream Hefei City, a large number of point source and non-point...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/62G01N33/18
CPCG01N33/18G06F18/24
Inventor 段洪涛陶慜曹志刚马荣华
Owner NANJING INST OF GEOGRAPHY & LIMNOLOGY
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