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Simulation of dam-break waves on movable beds using a multi-stage centered scheme

International Journal of Sediment Research 2013年第3期28卷 269-284页

作者： Stefania EVANGELISTA mustafa S.altinakar Cristiana DI CRISTO Angelo LEOPARDI Dipartimento di Ingegneria Civile e Meccanica Universita degli Studi di Cassino e del Lazio Meridionale NCCHE National Center for Computational Hydroscience and EngineeringUniversity of Mississippi

This paper presents the application of the multi-stage first-order centered scheme GMUSTA to solve a two-phase flow model with four equations for simulating dam-break floods without and with sediment *** of generalized Riemann invariants can be particularly complex and costly in simulating dam-break floods with sediment *** numerical scheme,which does not require complete knowledge of the eigenstructure of the hyperbolic mathematical model,offers a suitable and attractive *** quality of the dam-break flood simulations with GMUSTA scheme is verified by comparing the results against laboratory tests and some experimental data available in the literature,on fixed and mobile bed conditions,with different bed materials and flush or stepped *** numerical results reproduce quite well the experimental evidence,proving that the model is capable of predicting the temporal evolution of the free-surface and the *** GMUSTA scheme,which is not only simple to implement but also both accurate and computationally efficient,is proposed as an appropriate tool for integrating non-equilibrium sediment-transport models.

关键词： Dam break Sediment transport Shallow water Multi-stage scheme GMUSTA

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DEPTH-AVERAGE ANALYSIS OF HYSTERESIS BETWEEN FLOW AND SEDIMENT TRANSPORT UNDER UNSTEADY CONDITIONS

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International Journal of Sediment Research 2006年第2期21卷 101-112页

作者： mustafa altinakar Sam S.Y.WANG National Center for Computational Hydroscience and Engineering The University of Mississippi MS 38677 USA Res. Prof. National Center for Computational Hydroscience and Engineering The University of Mississippi MS 38677 USA Prof.

A depth-averaged two-dimensional model has been established to simulate unsteady flow and sediment transport in streams. The difference in flow and sediment velocities is considered. It has been found that the depth-averaged suspended-sediment velocity and the bed-load velocity are smaller than the depth-averaged flow velocity, inducing a time lag between water and sediment transport. The significance of this time lag increases as the sediment size increases. The exchange between the moving sediment and the bed material, which may induce a spatial lag, is modeled by a non-equilibrium transport approach. Tests using laboratory and field measurements have shown that the established model is capable of capturing the hysteresis between flow and sediment transport under unsteady conditions. It is demonstrated that the hysteresis is larger when the hydrograph has steeper rising and falling limbs, and the time delay increases downstream.

关键词： Hysteresis Temporal and spatial lags Unsteady flow Sediment transport Depth- averaged 2-D model Non-equilibrium transport

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