| Citation: | XIE Yunxuan，WANG Yang，WANG Mengyao，et al. Water resistance coefficient of bank slope landslides via physical model experiments[J]. Bulletin of Geological Science and Technology，2025，44（2）：1-8 doi: 10.19509/j.cnki.dzkq.tb20240247
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Hydrodynamic resistance is one of the key factors influencing the velocity of landslides entering water. To quantify the resistance experienced by reservoir bank landslides upon water entry and provide experimental data and a theoretical basis for analyzing their entry velocity, this study designed an experiment to measure the water entry resistance coefficient.
Based on the dynamics and kinematics equations of submerged test blocks, a comprehensive calculation model for the water resistance coefficient was established. The experimental results were analyzed using dimensionless analysis methods to investigate the effects of various dimensionless factors on the water resistance coefficient. A multiple linear regression analysis was conducted to derive the comprehensive water resistance coefficient calculation model. Taking the Baige landslide of October 11, 2018, as a case study, the velocity of the Baige landslide was calculated using the theoretical formula for the water resistance coefficient, and the results were compared with those obtained from other methods.
The results indicate that as relative velocity increases, the comprehensive water resistance coefficient initially rises and then decreases. Additionally, as the relative cross-sectional area increases, the comprehensive water resistance coefficient decreases. The theoretical formula for the water resistance coefficient has a coefficient of determination (
This study proposes a comprehensive calculation model for the water resistance coefficient, addressing the challenge of determining its value accurately. This model contributes to improving the prediction accuracy of the entry velocity of reservoir bank landslides, thereby enhancing risk assessment and mitigation efforts.
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