Journal of
Ecology and The Natural Environment

  • Abbreviation: J. Ecol. Nat. Environ.
  • Language: English
  • ISSN: 2006-9847
  • DOI: 10.5897/JENE
  • Start Year: 2009
  • Published Articles: 370

Full Length Research Paper

Contribution of spring and summer hydrodynamic conditions in the eutrophication process at Lake Taihu, China

Qhtan Asmaa
  • Qhtan Asmaa
  • Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Nanjing, 210098, China.
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Yiping Li
  • Yiping Li
  • Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Nanjing, 210098, China.
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Jin Wei
  • Jin Wei
  • Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Nanjing, 210098, China.
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Abdul Jalil
  • Abdul Jalil
  • Department of Botanical and Environmental Sciences, Kohat University of Science and Technology, Kohat, Pakistan.
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Minsheng Bu
  • Minsheng Bu
  • Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Nanjing, 210098, China.
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Xiaomeng Gao
  • Xiaomeng Gao
  • Zhejiang Keepsoft Information and Technology Corp., Ltd, Hangzhou, 310051, China.
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Wei Du
  • Wei Du
  • Nanjing Institute of Environmental Science, the Ministry of Environment Protection of PRC, Nanjing, 210042, China.
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Wencai Wang
  • Wencai Wang
  • South China Institute of Environmental Sciences, the Ministry of Environment Protection of PRC, Guangzhou, 510655, China.
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Jianwei Wang
  • Jianwei Wang
  • HydroChina Huadong Engineering Corporation, Hangzhou, 310014, China.
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  •  Received: 28 January 2020
  •  Accepted: 02 March 2020
  •  Published: 31 May 2020

Abstract

Contribution of different hydrodynamic conditions caused nutrients released and algal blooms growth and deteriorates water quality. Important factors related to climate variation, such as water temperature, precipitation, wind, solar radiation, and human activities can influence trophic conditions in the water column. A field survey was conducted at Meiliang Bay during spring and summer seasons and in diverse hydrodynamic conditions. The study aimed to investigate the variation of wave shear stress generated by strong wind and vessels. The measurement results showed that the shear stress increased in direction with increasing wind speed and significant wave heights. Wave shear stress τ has a maximum value = 0.2 Nm2 during weak wind 1.5-2.5 m/s and significant wave height = 0.20 m while, it has a maximum value = 0.8 Nm2 with strong wind range from 4.5 to 10 m/s corresponding with the significant wave height which has maximum value = 0.65 m in 2014. Also, wave shear stress τ has maximum value = 0.25 Nm2 with maximum significant wave height = 0.6 m during passages vessels in 2016. It ranges from - 0.8 to 0.8 Nm2 with maximum wave amplitude value U = 0.4 m/s passages heavy ship in 2018. The results indicated that the bottom layer has a major impact, with strong winds and vessels' induced waves. Furthermore, the shear stress generated by those forces impacted directly on the boundary of the lake and caused sediment resuspension leading to release nitrogen. The outcomes of this paper give a clear idea about the processes happening in the lake.
 
Key words: Vessels, hydrodynamic, waves, shear stress, Meiliang Bay, Lake Taihu.