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| 1 | A new algorithm for bank-failure mechanisms in 2D morphodynamic models with unstructured grids显示文摘河岸失败是在似地球形状的过程的重要现象。面对河岸或陡峭的 bedforms,水级的上升深深地导致的倒塌机制与沉积运输过程一起影响床进化。在这份报纸,能够在一个二维的二阶段的 morphodynamic 模型模仿如此的机制的一个算法被介绍。混合的 A 以房间为中心、以节点为中心的有限卷的 discretization,使用一个未组织的三角形的网孔并且在只有一个意义地要定义的每个房间允许斜坡,被建议。geo 失败操作员保证当在房间床斜坡超过一个批评角度时,相应的床材料和毛孔水将成为床运输的部分并且然后将跟随二阶段的流动的动态方程。算法有效性被一些试验性的测试的数字繁殖从文学显示出。 | Stefania Evangelista Massimo Greco Michele Iervolino Angelo Leopardi Andrea Vacca | 2015 | International Journal of Sediment Research2015，30，4： | 4 |
| 2 | Numerical simulation of mud-flows impacting structures显示文摘The study of the interaction of mud-flows with obstacles is important to define inundation zones in urban areas and to design the possible structural countermeasures. The paper numerically investigates the impact of a mud-flow on rigid obstacles to evaluate the force acting on them using two different depth-integrated theoretical models, Single-Phase Model(SPM) and Two-Phase Model(TPM), to compare their performance and limits. In the first one the water-sediment mixture is represented as a homogeneous continuum described by a shearthinning power-law rheology. Alternatively, the twophase model proposed by Di Cristo et al in 2016 is used, which separately accounts for the liquid and solid phases. The considered test cases are represented by a 1D landslide flowing on a steep slope impacting on a rigid wall and a 2D mud dam-break flowing on a horizontal bottom in presence of single and multiple rigid obstacles. In the 1D test case, characterized by a very steep slope, the Two-Phase Model predicts the separation between the two phases with a significant longitudinal variation of the solid concentration. In this case the results indicate appreciable differences between the two models in the estimation of both the wave celerity and the magnitude of the impact, with an overestimation of the peak force when using the Single-Phase Model. In the 2D test-cases, where the liquid and solid phases remain mixed, even if the flow fields predicted by the two models present some differences, the essential features of the interaction with the obstacles, along with the maximum impact force, are comparable. | GRECO Massimo DI CRISTO Cristiana IERVOLINO Michele VACCA Andrea | 2019 | Journal of Mountain Science2019，16，2： | 2 |
| 3 | Simplified Wave Models Applicability to Shallow Mud Flows Modeled as Power-Law Fluids显示文摘Simplified wave models- such as kinematic,diffusion and quasi-steady- are widely employed as a convenient replacement of the full dynamic one in the analysis of unsteady open-channel flows,and especially for flood routing.While their use may guarantee a significant reduction of the computational effort,it is mandatory to define the conditions in which they may be confidently applied.The present paper investigates the applicability conditions of the kinematic,diffusion and quasisteady dynamic shallow wave models for mud flows of power-law fluids.The power-law model describes in an adequate and convenient way fluids that at low shear rates fluids do not posses yield stress,such as clay or kaolin suspensions,which are frequently encountered in Chinese rivers.In the framework of a linear analysis,the propagation characteristics of a periodic perturbation of an initial steady uniform flow predicted by the simplified models are compared with those of the full dynamic one.Based on this comparison,applicability criteria for the different wave approximations for mud flood of power-law fluids are derived.The presented results provide guidelines for selecting the appropriate approximation for a given flow problem,and therefore they may represent a useful tool for engineering predictions. | Cristiana DI CRISTO Michele IERVOLINO Andrea VACCA | 2014 | Journal of Mountain Science2014，11，6： | 1 |
| 4 | A two-phase model for fast geomorphic shallow flows显示文摘纸介绍 2D 浅水模型基于为快似地球形状的 transients 的分析的二阶段的明确的表达发生在河 morphodynamics 的上下文。质量和动量保存原则独立为两个阶段被强加。模型自然地说明非平衡固体运输,自从两个即时改编假设也不任何东西落后方程被采用代表沉积动力学。建议模型的夸张特性被显示在流动条件上独立地被保存。从 1D 和 2D 测试用例的数字模拟的结果与文学相比试验性的数据并且与可得到的数字解决方案。 | Massimo GRECO Michele IERVOLINO Angelo LEOPARDI Andrea VACCA | 2012 | International Journal of Sediment Research2012，27，4： | 0 |
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