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Determination of threshold parameter in quadrant splitting for identifying coherent motions in Lake Taihu, China

  • Jin Wei
  • Yiping Li
  • Shenglin Weng
  • Dongjing Huang
  • Wei Du
  • Xiaomeng Gao
  • Wencai Wang
  • Jianwei Wang
  • Shuangshuang Zhang
  • Mercy Jepkirui
  • Amechi S. Nwankwegu
  • Eyram Norgbey
  • Qhtan Asmaa
Sediments, Sec 2 • Physical and Biogeochemical Processes • Research Article
  • 9 Downloads

Abstract

Purpose

Coherent motion plays a significant role in sediment resuspension, which is an important cause of eutrophication in Lake Taihu. The most popular approach in detecting coherent motion in wall turbulence is quadrant splitting. However, an important threshold parameter (H) is set by empiricism during inspection above which burst event occurs. This study is aimed at eliminating the erroneous detection caused by this empirical parameter in identifying coherent motions, giving an objective range of H for Lake Taihu and then illustrating the interactions between coherent motion and sediment resuspension.

Materials and methods

Based on in situ monitoring with Acoustic Doppler Velocimetry (ADV) and Optical Backscatter Sensor (OBS), high-frequency data of three-dimensional velocities and suspended sediment concentration at the bottom of Lake Taihu were obtained. Autocorrelation function and quadrant splitting were jointly adopted to determine parameter H without any empiricism.

Results and discussion

The value of parameter H varied from 0.72 to 1.28 in Lake Taihu, and an increase of 0.56 in H value led to decreases of 10.7–24.1% in the stress fraction and 14.7–26.5% in the sediment flux fraction. At the Central Zone site, the dominant motions were ejection and sweep, while inward and outward interactions dominated the exchange processes at the East Bay site. Only 16.8, 14.3, and 17.0% of the time fractions of coherent motions contributed up to 58.3, 74.5, and 55.0% to the sediment flux fractions at different observation sites, and the larger time fractions of burst events contributed less to sediment flux fractions due to the less effect from wind waves and the lack of upwelling currents.

Conclusions

Burst events with large amplitude and short duration contributed significantly to the processes of sediment exchanges. Calculation results of momentum and sediment resuspension fluxes are very sensitive to parameter H, taking one fixed empirical value for H is unsuitable for Lake Taihu. These findings will provide a useful reference for identifying coherent motions precisely and understanding the interactions between coherent motion and sediment resuspension in Lake Taihu.

Keywords

Coherent motion Lake Taihu Quadrant splitting Sediment resuspension Threshold parameter 

Notes

Funding

The research was supported by National Science Funds for Creative Research Groups of China (No. 51421006); National Key Research and Development Plan (2016YFC0401703, 2017YFC0405203), and Chinese National Science Foundation (51779072, 51579071, 41323001, 51539003); the program of Dual Innovative Talents Plan and Innovative Research Team in Jiangsu Province; Postgraduate Research & Practice Innovation Program of Jiangsu Province; the Priority Academic Program Development of Jiangsu Higher Education Institutions, and the Fundamental Research Funds for the Central Universities.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Jin Wei
    • 1
  • Yiping Li
    • 1
  • Shenglin Weng
    • 1
  • Dongjing Huang
    • 2
  • Wei Du
    • 3
  • Xiaomeng Gao
    • 4
  • Wencai Wang
    • 5
  • Jianwei Wang
    • 6
  • Shuangshuang Zhang
    • 7
  • Mercy Jepkirui
    • 1
  • Amechi S. Nwankwegu
    • 1
  • Eyram Norgbey
    • 1
  • Qhtan Asmaa
    • 1
  1. 1.Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, College of EnvironmentHohai UniversityNanjingChina
  2. 2.Department of water conservancy and environmental engineeringZhejiang University of Water Resources and Electric PowerHangzhouChina
  3. 3.Nanjing Institute of Environmental Sciencethe Ministry of Environment Protection of PRCNanjingChina
  4. 4.Environmental Science Research and Design Institute of Zhejiang ProvinceHangzhouChina
  5. 5.South China Institute of Environmental Sciencesthe Ministry of Environment Protection of PRCGuangzhouChina
  6. 6.HydroChina Huadong Engineering CorporationHangzhouChina
  7. 7.Suzhou University of Science and TechnologySuzhouChina

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