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首页> 外文期刊>Journal of the American Water Resources Association >COMPARISON OF UNSTEADY AND QUASI-UNSTEADY FLOW MODELS IN SIMULATING SEDIMENT TRANSPORT IN AN EPHEMERAL ARIZONA STREAM
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COMPARISON OF UNSTEADY AND QUASI-UNSTEADY FLOW MODELS IN SIMULATING SEDIMENT TRANSPORT IN AN EPHEMERAL ARIZONA STREAM

机译：模拟海面流沙流中非恒定流与准非恒定流模型的比较

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摘要

Hydrodynamic and sediment transport models are useful engineering tools for predicting unsteady flood flow and sediment transport. Many models such as HEC-RAS, HEC-6, and IALLUVIAL apply quasi-unsteady flow model, whereas others apply the unsteady flow model. It remains unknown if a quasi-unsteady flow model is sufficiently accurate for simulating sediment transport in rapidly varied unsteady flood events, especially in ephemeral rivers in arid and semiarid regions. This study compared the quasi-unsteady HEC-RAS 4.1 model with one-dimensional (ID) Finite Volume Method (FVM) based model in simulating flood flow and sediment transport in the Pantano Wash, a dryland river in the state of Arizona. The objective is to determine which sediment transport method is appropriate in predicting bed elevation changes in an ephemeral stream, Pantano Wash, and if an unsteady model is more accurate than a quasi-unsteady flow model in predicting sediment transport. Results showed that the quasi-unsteady HEC-RAS model and the ID FVM yielded similar results of bed degradation and aggradation for this dryland stream, although the FVM model predicted better flood hydrographs. Among the seven sediment transport formulas embedded in HEC-RAS, Yang's and Engel-und-Hansen's equations gave the best matches with the field measurements for this particular case study.
机译：流体动力和泥沙输送模型是预测不稳定的洪水流量和泥沙输送的有用工程工具。 HEC-RAS，HEC-6和IALLUVIAL等许多模型都应用准非稳态流模型，而其他模型则应用非稳态流模型。准不稳定流模型是否足够准确地模拟快速变化的不稳定洪水事件中的泥沙输运仍是未知的，特别是在干旱和半干旱地区的短暂河流中。这项研究将准不稳定的HEC-RAS 4.1模型与基于一维（ID）有限体积法（FVM）的模型进行了比较，以模拟亚利桑那州旱地河流Pantano Wash的洪水流量和泥沙输送。目的是确定哪种沉积物输送方法适合预测短暂河流Pantano Wash中河床高度的变化，以及在预测沉积物输送中非稳态模型是否比准非稳态流模型更准确。结果表明，尽管FVM模型预测了更好的洪水水文图，但拟不稳定的HEC-RAS模型和ID FVM对该旱地河流产生了相似的河床退化和水化的结果。在嵌入到HEC-RAS中的七个沉积物输运公式中，Yang's和恩格尔-und-Hansen公式与该特定案例研究的野外测量值最匹配。

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