RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2017, Vol. 26 >> Issue (06): 915-924.doi: 10.11870/cjlyzyyhj201706014

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STUDY ON THE VERTICAL STRATIFICATION IN POYANG LAKE

LI Yun-liang1,2, YAO Jing2, ZHANG Xiao-lin2,3, ZHANG Qi2,4   

  1. 1. State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing 210098, China;
    2. Key Laboratory of Watershed Geographic Sciences, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China;
    3. University of the Chinese Academy of Sciences, Beijing 100049, China;
    4. Key Laboratory of Poyang Lake Wetland and Watershed Research, Ministry of Education, Jiangxi Normal University, Nanchang 330022, China
  • Received:2016-10-09 Revised:2016-11-23 Online:2017-06-20
  • Supported by:
    Open Foundation of State Key Laboratory of HydrologyWater Resources and Hydraulic Engineering (2014491611);CollaborativeInnovation Center for Major Ecological Security Issues of Jiangxi Province and Monitoring Implementation (JXS-EW-00);National Natural Science Foundation of China (41401031, 41371062 and 41301023)

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Abstract: Although mixing in lakes has significant environmental and ecological implications, knowledge of mixing dynamics for shallow floodplain lakes has received little attention. In this study we used a combination of hydrological and thermal investigations to provide evidence for the mixing in a large, shallow floodplain of Poyang Lake (China). Depth profiles of water temperature and stable hydrogen and oxygen isotope compositions were measured throughout the lake. Results showed that although the water temperature differences of up to 1.5°C were observed occasionally during the high lake water level period, Poyang Lake appeared to have isothermal mixed-layers from the upper epilimnion to the bottom hypolimnion attributed to the presence of mostly small temperature differences (0.5–1°C). The stable isotope composition revealed that the water columns of the lake were almost homogeneous during low and high lake water level periods. Poyang Lake appears to be well mixed or full mixing on a seasonal basis, depending on hydrological forcing within the lake, rather than meteorological conditions. Additionally, the vertical mixing of Poyang Lake appeared to have a close relationship with the aquatic environment due to mostly small differences in the vertical distributions of suspended sediments, TN and TP. The current study is the first to explore the stratification of Poyang Lake, which will help to improve our knowledge of water flow patterns and pollutant transport within the lake.

Key words: floodplain Poyang Lake, lake stratification or mixing, water temperature, hydrogen and oxygen isotopes, aquatic environment, influencing factor

CLC Number: 

  • P339
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