RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2011, Vol. 20 >> Issue (12): 1475-.

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DETERMINATION OF SPATIAL AND TEMPORAL DISTRIBUTION OF CYANOBACTERIAL WATER BLOOM IN TAIHU LAKE USING MODIS IMAGE DATA

ZHAO Jiahu1,2, GAO Junfeng1, LIU Jutao3, XU Yan1,2   

  1. (1.Nanjing Institute of Geography and Limnology,Chinese Academy of Sciences|Nanjing 210008, China|2.Graduate University of Chinese Academy of Sciences,Beijing 100049,China|3.Jiangxi Provincial Institute of Water Sciences,Nanchang 330029,China
  • Online:2011-12-20

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Abstract:

Based on multitemporal MODIS image data processed by band ratio algorithm，we extracted the distribution of cyanobacteria bloom in Taihu Lake during the period of 2004～2010 in sunny days and analyzed its spatiotemporal variation.Results showed that during 2004～2010,cyanobacteria bloom in Taihu Lake area happened 539 times totally.During 2004～2007 the initial time of cyanobacteria bloom was advanced and its frequency increased year by year,while during 2007～2010 the time was put off and its frequency decreased.The cyanobacteria bloom occurred more frequently between March and August while less frequently between August and December in each year.Spatial analysis results of 2004～2010 showed that the cyanobacteria bloom happened much more frequently in the northern and western lake areas than in the eastern and southern lake areas.The frequency of bloom happened in each lake areas can be ordered as:western offshore>main body of Taihu Lake>Meiliang Bay>Southern riverside area>Zhushan lake>Gonghu Lake.

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