In this study, a numerical model for river ice dynamics (DEMRICE) based on the discrete element method is developed. The ice dynamic component of this model considers moving surface ice floes as discrete elements. It uses a three-dimensional dilated polyhedral discrete element method to resolve contact and external forces on individual ice floes. The hydrodynamic component uses a streamline upwind Petrov–Galerkin (SUPG) finite-element method to solve the two-dimensional unsteady hydraulic equations. The model is validated with the analytical solution for equilibrium ice jams and the DynaRICE model. The ice jam evolution in a straight rectangular channel and the corresponding flow condition changes are simulated and discussed. Finally, the model is applied to simulate the ice transport and cover development in a reach of the Yellow River near Shisifenzi, Inner Mongolia.

在这项研究中，开发了一种基于离散元法的河冰动力学数值模型（DEMRICE）。该模型的冰动力分量将移动的表面浮冰视为离散元素。它使用三维膨胀多面体离散元方法来解决单个浮冰上的接触和外力。水动力部分采用流线逆风彼得罗夫-加勒金 (SUPG) 有限元法求解二维非定常水力方程。该模型通过平衡冰塞的解析解和 DynaRICE 模型进行了验证。对直矩形通道内的冰堵演化及相应的流动条件变化进行了模拟和讨论。最后，