A numerical model for heterogeneous and confined debris flows
The flow equation for a uniform debris flow can be obtained, analytically, from integration of the local constitutive equations only in very simple schemes, for example under the assumption of uniform solid concentration and absence of lateral walls. The flow discharges computed using these assumptions are much higher than those observed. In this paper a less restrictive solution is attempted. The fluid is assumed monophase (equal velocity of solids and fluid) and heterogeneous (solid concentration variable in the cross section). The effect of the mixture heterogeneity is described, and for a monophase fluid the constitutive parameters are expressed as a function of local solid concentration. A computational code has been implemented for estimating the concentration and velocity distribution in the cross section. The code is applied to a viscoplastic (Herschel-Bulkley) mixture.
debris-flow resistance Herschel-Bulkley model concentration profile velocity profile
M.N. Papa R. Martino
Department of Civil Engineering, University of Salerno, Italy Department of Hydraulic and Environmental Engineering G. Ippolito, University of Naples, Italy
国际会议
成都
英文
197-207
2007-05-17（万方平台首次上网日期，不代表论文的发表时间）