SHI Xiaoli, QIN Boqiang. GRAIN-SIZE CHARACTERISTICS AND THEIR ENVIRONMENTAL SIGNIFICANCE OF WANGHU LAKE SEDIMENTS IN THE MIDDLE REACH OF YANGTZE RIVER[J]. Marine Geology & Quaternary Geology, 2009, 29(2): 117-122. DOI: 10.3724/SP.J.1140.2009.02117
Citation: SHI Xiaoli, QIN Boqiang. GRAIN-SIZE CHARACTERISTICS AND THEIR ENVIRONMENTAL SIGNIFICANCE OF WANGHU LAKE SEDIMENTS IN THE MIDDLE REACH OF YANGTZE RIVER[J]. Marine Geology & Quaternary Geology, 2009, 29(2): 117-122. DOI: 10.3724/SP.J.1140.2009.02117
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GRAIN-SIZE CHARACTERISTICS AND THEIR ENVIRONMENTAL SIGNIFICANCE OF WANGHU LAKE SEDIMENTS IN THE MIDDLE REACH OF YANGTZE RIVER

  • 1 Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China;

  • 2 Graduate School, Chinese Academy of Sciences, Beijing 100049, China;

  • 3 Ningbo University, Ningbo 315211, China

More Information
  • Received Date: December 17, 2008
  • Revised Date: February 17, 2009
    Graphical Abstract
    • Abstract
  • Sediment cores were collected in November 2007 from Wanghu Lake, a river-connecting lake before 1960s, in the middle reach of the Yangtze River.Grain sizes of sediment samples were analyzed using Mastersizer 2000 and the grain-size parameters were calculated by moment method. Sedimentation rates were determined with high-resolution radionuclide timing (137Cs and 210Pb-date to age-depth profile translation). The results show that the average sedimentation rate of Wanghu Lake is about 0.56 a/cm and the grain size parameters occur obviously fluctuating due to annual precipitation variation and flood. The average grain size is increasing, the coefficient of sorting is worse, and the feature of kurtosis is wider during heavy rainfalls and flood. After 1950s,human activities, such as the hydraulic engineering construction, the development of industry and agriculture, reclaiming land from the lake, resulted in remarkable increase of erosion and more terrestrial materiells were carried into Wanghu Lake. Therefore, the average grain size of deposit gradually increased.
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