A quasi single-phase model for debris flows and its comparison with a two-phase model |
| |
Authors: | Chun-chen Xia " target="_blank">Ji Li " target="_blank">Zhi-xian Cao " target="_blank">Qing-quan Liu " target="_blank">Kai-heng Hu |
| |
Institution: | 1.State Key Laboratory of Water Resources and Hydropower Engineering Science,Wuhan University,Wuhan,China;2.Department of Mechanics, School of Aerospace Engineering,Beijing Institute of Technology,Beijing,China;3.Institute of Mountain Hazards and Environment,Chinese Academy of Sciences,Chengdu,China |
| |
Abstract: | A depth-averaged quasi single-phase mixture model is proposed for debris flows over inclined bed slopes based on the shallow water hydrosediment-morphodynamic theory with multi grain sizes. The stresses due to fluctuations are incorporated based on analogy to turbulent flows, as estimated using the depth-averaged k-? turbulence model and a modification component. A fully conservative numerical algorithm, using wellbalanced slope limited centred scheme, is deployed to solve the governing equations. The present quasi single-phase model using four closure relationships for the bed shear stresses is evaluated against USGS experimental debris flow and compared with traditional quasi single-phase models and a recent physically enhanced two-phase model. It is found that the present quasi single-phase model performs much better than the traditional models, and is attractive in terms of computational cost while the two-phase model performs even better appreciably. |
| |
Keywords: | |
本文献已被 CNKI SpringerLink 等数据库收录! |
|