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The applications of Seasonal Spatial Distribution of Chlorophyll-a and Suspended Solids Concentration in Poyang Lake, China have been released
2018-10-15  |   Editor : houguangbing  
Category : News

Abstract

Poyang lake is China's largest freshwater lake, it plays an important role in flood control and regulation and storage, protection of biodiversity and other aspects. The concentration of chlorophyll-a in water is an indicator of the distribution of plankton, in addition, suspended solids concentration is one of the important parameters that evaluate lake water quality and water environment. The Disaster Risk Reduction Knowledge Service System platform developed the application of spatial distribution of the seasonal chlorophyll-a concentration from 2009 to 2012 and the application of suspended solids concentration inversion respectively from 2000 to 2013 in Poyang Lake.

Content

Poyang Lake is the largest freshwater lake in China. It plays an important role in flood control, regulation and storage and biodiversity protection. The concentration of chlorophyll-a in water is the basic indicator of water primary productivity and the degree of eutrophication. At present, there is still lack of research on the concentration of chlorophyll-a in Poyang Lake.

The research process is as follows: First of all, water body spectral information of Poyang Lake was measured, and the spectral index was constructed basing on the water spectral characteristics analysis; Then, based on the least squares method and combined with measured chlorophyll-a concentrations data, sensitive band interval was calculated by regression analysis; MODIS data was used to build chlorophyll-a concentration estimation models of Poyang Lake by semi-empirical method, and the accuracy of the results was verified; Finally, chlorophyll-a concentration distribution data of Poyang Lake were retrieved using these models in January, April, July and October from 2009 to 2012.

Suspended solids concentration is one of the important parameters for evaluating lake water quality and water environment. The information on the distribution of suspended solids concentration in time and space based on remote sensing technology is of great significance for the environmental management of lakes. Four seasons’ inversion models were built according to the suspended solids concentration of Poyang Lake, continuously measured in spring, summer, autumn and winter season of 2009 and 2012 year, and combined with the regression analysis of the lake’s multi-band MODIS images in the same period. Then they are used to obtain the suspended solids concentration of the lake in annual spring, summer, autumn and winter seasons from year 2000 to 2013.

As a result, the Disaster Risk Reduction Knowledge Service System platform developed the application of spatial distribution of the seasonal chlorophyll-a concentration from 2009 to 2012 and the application of suspended solids concentration inversion respectively from 2000 to 2013 in Poyang Lake.

The links of two applications are:

http://drr.ikcest.org/knowledge_service/poyang_yls.html

http://drr.ikcest.org/knowledge_service/poyang_lake.html

Provided by the IKCEST Disaster Risk Reduction Knowledge Service System

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