Received: 13 Feb 2022 – Discussion started: 07 Apr 2022
Abstract. To predict the morphology of debris flow deposits, a control volume finite element model (CVFEM) is proposed, balancing material fluxes over irregular control volumes. Locally, the magnitude of these fluxes is taken proportional to the difference between the surface slope and a critical slope, dependent on the thickness of the flow layer. For the critical slope, a Mohr–Coulomb (cohesive-frictional) constitutive relation is assumed, combining a yield stress with a friction angle. To verify the proposed framework, the CVFEM numerical algorithm is first applied to idealized geometries, for which analytical solutions are available. The Mohr–Coulomb constitutive relation is then checked against debris flow deposit profiles measured in the field. Finally, CVFEM simulations are compared with laboratory experiments for various complex geometries, including canyon-plain and canyon-valley transitions. The results demonstrate the capability of the proposed model and clarify the influence of friction angle and yield stress on deposit morphology. Features shared by the field, laboratory, and simulation results include the formation of steep snouts along lobe margins.
Model codes and data for "A control volume finite element model for predicting the morphology of cohesive-frictional debris flow deposits"Tzu-Yin Kasha Chen; Ying-Chen Wu; Chi-Yao Hung; Herve Capart; Vaughan R. Voller https://doi.org/10.5281/zenodo.5933841
Tzu-Yin Chen et al.
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Predicting the extent and thickness of debris flow deposits is important for assessing and mitigating hazards. We propose a simplified mass balance model for predicting the morphology of a terminated debris flow depositing over complex topography. A key element in this model is that the termination of flow of the deposit is determined by prescribed values of yield stress and friction angle. The model results are consistent with available analytical solutions, field and laboratory observations.
Predicting the extent and thickness of debris flow deposits is important for assessing and...