Prediction model of the collapse of bank slope under the erosion effect of wind-induced wave in the Three Gorges Reservo
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ORIGINAL ARTICLE
Prediction model of the collapse of bank slope under the erosion effect of wind‑induced wave in the Three Gorges Reservoir Area, China Li Wang1,2 · Fei Guo1,2 · Shimei Wang1,2 Received: 8 March 2020 / Accepted: 3 September 2020 / Published online: 15 September 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract During the storage period of the Three Gorges Reservoir, the bank erosion caused by wind-induced wave is getting more serious, especially for the crushed stone soil bank. The continuous wave scouring and erosion destabilize the bank slope and even induce the occurrence of landslides. Based on the energy conservation theory, the bank slope will reach a stable state after continuous wave erosion. Regarding this, this paper derives the prediction formula of the stable slope angle and erosion width when the wave erodes the crushed stone soil bank slope. Model tests on bank slopes with different dry densities and different crushed stone contents under the action of waves were conducted to observe the erosion process of wave-induced crushed stone soil bank slope and verify the proposed prediction formula. The results show that under the action of wave erosion, erosion ridge and collapse steep angle would form at the upper edge of the bank slope and the controlling factors of this process are the dry density of the crushed stone soil and the wave energy. When the content of crushed stone soil gradually increases, the ability of the bank slope to resist wave erosion weakens at first and then gradually strengthens. Comparing the erosion stable slope angle obtained from the model tests with the calculated results using the proposed prediction formula, a linear relationship could be observed, indicating that the proposed prediction formula is reliable for further analysis. Keywords Three Gorges Reservoir · Erosion · Bank collapse prediction · Model test
Introduction After the completion of the Three Gorges Project, the reservoir water level has fluctuated periodically from 145 to 175 m, with a variation of up to 30 m. Long-term reservoir water-level fluctuations have caused significant changes in the physical and mechanical properties of the bank slope, resulting in a large number of geological disasters (Liao et al. 2005). With the deepening understanding on major issues such as the resurgence mechanism and prediction evaluation of landslides in the Three Gorges reservoir area (Sun et al. 2017, 2020; Wang et al. 2017; Zhang et al. 2020), as well as the implementation of a large number of landslide control projects, major landslide disasters have been * Fei Guo [email protected] 1
College of Civil Engineering and Architecture, China Three Gorges University, Yichang 443002, Hubei, China
Key Laboratory of Disaster Prevention and Mitigation of Hubei Province, China Three Gorges University, Yichang 443002, China
2
effectively controlled. As a result, the bank slope collapse has become the most common and increasingly serious geological disaster in the Three Gorges r
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