| DEPTH-AVERAGE ANALYSIS OF HYSTERESIS BETWEEN FLOW AND SEDIMENT TRANSPORT UNDER UNSTEADY CONDITIONS |
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| 作者姓名： | Weiming WU Mustafa ALTINAKAR Sam S. Y. WANG |
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| 作者单位： | 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. |
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| 摘 要： | 1 INTRODUCTION Flow and sediment transport in natural rivers are generally unsteady, and exhibit temporal and spatial lags. Traditionally, in most hydraulic engineering problems the unsteady flow and sediment transport are approximately treated as steady …
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| 关 键 词： | 滞后作用 时空变化 非稳定流 沉积物 迁移现象 河道演变 |
| 收稿时间： | 2004-11 |
| 修稿时间： | 2005-03 |
DEPTH-AVERAGE ANALYSIS OF HYSTERESIS BETWEEN FLOW AND SEDIMENT TRANSPORT UNDER UNSTEADY CONDITIONS |
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| Weiming WU Mustafa ALTINAKAR Sam S. Y. WANG.DEPTH-AVERAGE ANALYSIS OF HYSTERESIS BETWEEN FLOW AND SEDIMENT TRANSPORT UNDER UNSTEADY CONDITIONS[J].International Journal of Sediment Research,2006,21(2):101-112. |
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| Authors: | Weiming WU Mustafa ALTINAKAR Sam SYWANG |
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| Abstract: | 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. |
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| Keywords: | Hysteresis Temporal and spatial lags Unsteady flow Sediment transport Depth- averaged 2-D model Non-equilibrium transport |
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