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Preprints
https://doi.org/10.5194/hess-2020-63
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/hess-2020-63
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  18 Feb 2020

18 Feb 2020

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A revised version of this preprint was accepted for the journal HESS and is expected to appear here in due course.

The hydrodynamic and environmental characteristics of tributary bay influenced by backwater jacking and intrusion of main reservoir

Xintong Li1, Bing Liu2, Yuanming Wang1, Yongan Yang3, Ruifeng Liang1, Fangjun Peng1, Shudan Xue1, Zaixiang Zhu1, and Kefeng Li1 Xintong Li et al.
  • 1State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu 610065, China
  • 2Emergency Response Centre, Ecology and Environment Bureau of Suining, Suining 629000, China
  • 3Environmental Monitoring Centre, Ecology and Environment Bureau of Suining, Suining 629000, China

Abstract. The construction of large reservoirs results in the formation of tributary bays, and tributary bays are inevitably influenced by the backwater jacking and intrusion of the main reservoir. The hydrodynamic conditions and the environmental factors of tributary bays exhibit complex distribution characteristics and eutrophication occur frequently. Thus, exploring the distribution and evolution of the hydrodynamic and water environment characteristics of tributary bays in response to backwater jacking and intrusion is the key to solving eutrophication and other problems relevant to water environment. In this paper, a typical tributary bay (Tangxi River) of the Three Gorges Reservoir (TGR) was selected to study the hydrodynamic and environmental characteristics of the tributary bay influenced by the jacking and intrusion of the main reservoir. The flow field, water temperature and water quality of the Tangxi River were simulated using the hydrodynamic and quality model CE-QUAL-W2, and the eutrophication status of the tributary bay was also evaluated. The results showed that the main reservoir had different effects on its tributary bay in each month. The tributary bay was mainly affected by backwater jacking of the main reservoir when the water level dropped and by intrusion of the main reservoir when the water level rose. An obvious quality concentration boundary existed in the tributary bay, which was basically consistent with the regional boundary in the flow field. The flow field and water quality on both sides of the boundary were quite different. The results of this study can help us figure out how the backwater jacking and intrusion of the main reservoir influence the hydrodynamic and water environment characteristics of the tributary bay and provide guidance for water environment protection in the tributary bays.

Xintong Li et al.

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Xintong Li et al.

Xintong Li et al.

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Short summary
This paper aims to the hydrodynamic and environmental characteristics of tributary bay influenced by main reservoir. The results showed that the tributary bay was mainly affected by backwater jacking of the main reservoir when the water level dropped and by intrusion of the main reservoir when the water level rose. An obvious quality concentration boundary existed in the tributary bay. The results of this study can provide guidance for water environment protection in the tributary bays.
This paper aims to the hydrodynamic and environmental characteristics of tributary bay...
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