Inter-Annual Water Level Variations of the Yangtze-Poyang Confluence in Response to the Dam-Induced Flow-Sediment Changes

Zican He; Xin Zeng; Yiming Chen; Shiming Yao; Hualong Luan

doi:10.2991/978-94-6463-726-7_40

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Inter-Annual Water Level Variations of the Yangtze-Poyang Confluence in Response to the Dam-Induced Flow-Sediment Changes

Authors

Zican He¹^{, 2}^{, *}, Xin Zeng¹^{, 2}, Yiming Chen¹^{, 2}, Shiming Yao²^{, 3}, Hualong Luan¹^{, 2}

¹River Research Department, Changjiang River Scientific Research Institute, Wuhan, 430010, China

²Key Laboratory of Ministry of Water Resources On River & Lake, Changjiang River Scientific Research Institute, Wuhan, 430010, China

³Changjiang River Scientific Research Institute, Wuhan, 430010, China

^*Corresponding author. Email: zican_he@163.com

Corresponding Author

Zican He

Available Online 13 June 2025.

DOI: 10.2991/978-94-6463-726-7_40 How to use a DOI?
Keywords: the Yangtze-Poyang confluence; water level; Three Gorges Dam; riverbed erosion; flow process
Abstract: Over the past 60 years, the water level in the Yangtze-Poyang systems has undergone significant adjustments due to the combined effects of climate change and various human activities, profoundly impacting the residents’ livelihoods, economic and social development, and the ecological environment. Here, we combined hydraulic information and topographic data to address the seasonal water level adjustments at the Yangtze-Poyang confluence in the post-TGD period and quantify the impact of channel adjustments and altered flow processes on the water level. The results show that (1) The water level at the Yangtze-Poyang confluence exhibited slight variations during the Dry Season and the Discharge Season, but dropped significantly during the Flood Season and the Impounding Season, with a decrease of approximately 1 to 2.3 m; (2) In the post-dam period, the water level decreased significantly at low and medium flows, with a cumulative decline at Hukou Outlet exceeding 1 m at discharge of 10000-15000 m3/s. This decline was closely linked to the local riverbed downcutting. In contrast, the flood flow level remained stable despite the ongoing riverbed erosion; (3) Due to water replenishment, the increase in flow discharge released from reservoir groups during the Dry Season and Discharge Season has partially offset the impact of riverbed erosion. In contrast, water level fluctuations during the Flood Season and the Impounding Season in the post-dam period show a significant downward trend, primarily due to the combined influence of riverbed erosion and altered flow processes, with the latter exerting a more dominant effect.
Copyright: © 2025 The Author(s)
Open Access: Open Access This chapter is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/), which permits any noncommercial use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made.

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Volume Title: Proceedings of the 2024 6th International Conference on Hydraulic, Civil and Construction Engineering (HCCE 2024)
Series: Atlantis Highlights in Engineering
Publication Date: 13 June 2025
ISBN: 978-94-6463-726-7
ISSN: 2589-4943
DOI: 10.2991/978-94-6463-726-7_40 How to use a DOI?
Open Access: Open Access This chapter is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/), which permits any noncommercial use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made.

Cite this article

ris enw bib

TY  - CONF
AU  - Zican He
AU  - Xin Zeng
AU  - Yiming Chen
AU  - Shiming Yao
AU  - Hualong Luan
PY  - 2025
DA  - 2025/06/13
TI  - Inter-Annual Water Level Variations of the Yangtze-Poyang Confluence in Response to the Dam-Induced Flow-Sediment Changes
BT  - Proceedings of the 2024 6th International Conference on Hydraulic, Civil and Construction Engineering (HCCE 2024)
PB  - Atlantis Press
SP  - 409
EP  - 420
SN  - 2589-4943
UR  - https://doi.org/10.2991/978-94-6463-726-7_40
DO  - 10.2991/978-94-6463-726-7_40
ID  - He2025
ER  -

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