推移质运动的动力学模型

近底水充中推移质的输称属于固液二相流问题，本文针对固相推移质具有的随机和力学双重特性，通过类似分子运动论中Boltzmann方程的推导方法，建立起推移质运动的控制微分方程，其中碰撞项主要考虑推移层颗粒与床面层颗粒的碰撞效应，据此获得推移质输移问题的固液二相流模型－－动力学模型，将推移质通量与所受外力联系起来，便于揭示推移质运动的力学本质，开辟推移质理论研究的新途径。

A kinetic model for bedload transport.

Transport of bedload in the near\|bed flow substantially belongs to a problem of solid\|liquid two\|phase flow. According to the stochastic\|mechanistic properties of solid phase\|bedload, a differential equation governing the motion of bedload is strictly developed by an analogous approach to derive the Boltzmann equation in the kinetic theory of molecules. The collision term in the equation is involved mainly with the effect of collision between particles in the bedload layer and particles on the bed\|surface. The proposed equation for two\|phase flow, the so\|called kinetic model, connects bedload flux with the forces acting on particles moved as bedload and thus reveals the physical inbeing of bedload transport. The development of this equation provides a new theoretical approach for investigation of bedload movement.