نتایج جستجو برای: bagnold
تعداد نتایج: 81 فیلتر نتایج به سال:
Understanding erosion and entrainment of material by debris flows is essential for predicting modelling debris-flow volume growth hazard potential. Recent advances in field, laboratory studies have distilled two driving forces behind erosion: impact shear forces. How these depend on composition interact remains unclear. Here, we experimentally investigate the effects processes a small-scale flu...
There have been many attempts to derive continuum models for dense granular flow, but a general theory is still lacking. Here, we start with Mohr-Coulomb plasticity for quasi-two-dimensional granular materials to calculate (average) stresses and slip planes, but we propose a "stochastic flow rule" (SFR) to replace the principle of coaxiality in classical plasticity. The SFR takes into account t...
Recent experiments show that an avalanche initiated from a point source propagates downwards by invading a triangular shaped region. The opening angle of this triangle appears to reach 180o for a critical inclination of the pile, beyond which avalanches also propage upwards. We propose a simple interpretation of these observations, based on an extension of a phenomenological model for surface f...
Diverging correlation lengths on either side of the jamming transition are used to formulate a rheological model of granular shear flow, based on the propagation of stress through force chain networks. The model predicts three distinct flow regimes, characterized by the shear rate dependence of the stress tensor, that have been observed in both simulations and experiments. The boundaries separa...
Abstract Sediment transport in rivers is an important and complex process. It very to know the nature quantities of sediments transported course achieve prudent water management. Due presence most projects on or near banks river study area, so there always a fear that these will be affected by processes erosion, transport, sedimentation among decision makers. Therefore, need develop our knowled...
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