Performance of Artificial Bed-Wetting Parameter in a 1D Coulomb-Type Debris Flow Numerical Model
Received: 25 February 2025 | Revised: 12 March 2025 | Accepted: 18 March 2025 | Online: 30 March 2025
Corresponding author: Van Khoi Pham
Abstract
Debris flow, which usually occurs after a landslide event, can damage human property along its trajectory, especially when the flow front moves at high speed. Coulomb resistance flow is considered the fastest type of flow due to the inclusion of the only internal friction component in the source term of the numerical model. Additionally, in the one-dimensional (1D) Coulomb-type numerical solution, an artificial bed-wetting parameter is required to ensure model stability in dry areas. This study aimed to evaluate the performance of artificial bed-wetting parameters in terms of debris velocity and debris depth with various slope and friction angles in the 1D Coulomb-type debris flow numerical model. The analytical solution of the Coulomb resistance flow is used to quantify the accuracy of the numerical results obtained with different artificial bed-wetting parameters. Five cases of debris dam-break tests are investigated to evaluate the influence of artificial bed-wetting parameters on slope and internal friction angles through debris variables. The results show that debris depth and debris front velocity are more accurate with smaller values of the artificial bed-wetting parameter, larger slope angles, and smaller internal friction angles. Furthermore, an inverse relationship between slope angle and debris front velocity, and a reverse relationship between internal friction angle and debris front velocity, are identified as fundamental physical flow properties.
Keywords:
debris flow, Coulomb resistance, artificial bed-wetting, numerical modelDownloads
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