Changes in the backwater effect of Dongting Lake inflows on the Lower Jingjiang River after the impoundment of the Three Gorges Reservoir

Zhiqing Li; Zhaohua SUN; Li Chen (5749); Shanshan AN; Weixing ZHOU

doi:10.3724/j.slxb.20250601

April 1, 2026Journal of Hydraulic Engineering

Changes in the backwater effect of Dongting Lake inflows on the Lower Jingjiang River after the impoundment of the Three Gorges Reservoir

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Key Points

This research aims to analyze the changes in the backwater effect on the Lower Jingjiang River due to the impoundment of the Three Gorges Reservoir.
Employed Copula function to study inflow characteristics over different periods.
Developed a flow coupling relationship model based on fluvial motion laws.
Conducted a quantitative analysis of backwater event probabilities and intensities before and after Three Gorges Reservoir impoundment.
Increased probability of medium-low flow conditions merging with lake inflows by 44.6%.
Probability of main flow merging with flood conditions increased by 5.4%.
Reduction in average backwater intensity affecting the main river channel, with a shift towards extreme backwater events observed from April to July.

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Implication

Randomized analysis examines backwater effect changes in the Lower Jingjiang River, indicating significant new phenomena after reservoir construction.

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Li et al. (2026) studied this question.

synapsesocial.com/papers/6a2a51b580c8f91e7f39de5f https://doi.org/10.3724/j.slxb.20250601

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Changes in the backwater effect of Dongting Lake inflows on the Lower Jingjiang River after the impoundment of the Three Gorges Reservoir

Key Points

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Implication

Abstract

Discussion

Cite This Study

Changes in the backwater effect of Dongting Lake inflows on the Lower Jingjiang River after the impoundment of the Three Gorges Reservoir

Key Points

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Implication

Abstract

Discussion

Cite This Study

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