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| Influence of local gradual water depth variation on landslide-induced wave characteristics along reservoir banks |
| KE Chao1, MIAO Fasheng1*, WANG Yang1, WU Yiping1, LIU Jizhixian2 |
(1. Faculty of Engineering, China University of Geosciences, Wuhan, Hubei 430074, China;
2. Faculty of Civil Engineering, Hubei Engineering University, Xiaogan, Hubei 432000, China) |
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Abstract Landslides occurring along reservoir banks in narrow water bodies, due to local gradual water depth variations, may generate wave characteristics distinct from those in wider water bodies In this study, large-scale physical model experiments were conducted to investigate landslide-induced waves along reservoir banks in narrow water bodies. The wave propagation characteristics were analyzed in three specific regions: the water body above the riverbed (WRB), the water body above the opposite bank slope (WOB), and the water body above the original bank slope (WIB). The results reveal that the leading wave train, prior to the onset of run-up behavior, was influenced solely by the shoaling effect, without being affected by reflection, refraction, or breaking. The maximum relative amplitude of the first wave crest in the WRB and WOB regions occurred at an angle of 0° and decreased with increasing angles, while in the WIB region, it increased with increasing angles. The most significant attenuation of the first wave crest was observed at an angle of 10°, rather than at 0°. In regions closer to the landslide impact point, the propagating waves (excluding the edge waves in the WIB region) exhibited greater fluctuations. A relative distance of 4.85 (equivalent to 1.7 meters) was identified as the boundary beyond which the kinetic energy from the landslide no longer significantly influenced the first wave. Additionally, in areas closer to the landslide entry point, the correlation between the relative period and angle became more pronounced. The average initial wave velocities in the WRB, WIB, and WOB regions were 0.93, 0.87, and 1.03, respectively (all close to 1), indicating that the velocities of the first wave in all regions can be accurately approximated by long-wave theory.
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2026, Vol. 45 
