| DEPTH-INTEGRATED MODELING FOR AGGRADING/DEGRADING MOBILE CHANNELS I： MODEL DEVELOPMENT |
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| 作者姓名： | En-Tian LIN Chih-Tsung HSU Keh-Chia YEH |
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| 作者单位： | Research Engineer Civil Hydraulics and Informatics Technology Research Center Sinotech Engineering Consultants Inc. Taipei 10570 Taiwan China，Professor Department of Civil Engineering National Chiao Tung University Hsinchu 30010 Taiwan China |
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| 基金项目： | 科技部科研项目，the IBM SP2 computer of the National Center for High-Performance Computing |
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| 摘 要： | 1 INTRODUCTION The study of sediment transport in alluvial river is one of the most important fields in hydraulic engineering. Sediment transport has direct influence on the evolution of riverbeds, estuaries and coastlines, and, in turn, affects decision-making of flood control, operating rule of reservoir, design of hydraulic structure and many other aspects. Models with different orders of dimensions were presented in the literature, and most of them had common basis that they were formu…
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| 关 键 词： | 河道 冲积过程 过载泥沙流量 轻载泥沙流量 沉积物交换率 悬浮沉积物浓度 深度综合模型 |
| 收稿时间： | 2005-07 |
| 修稿时间： | 2006-03 |
DEPTH-INTEGRATED MODELING FOR AGGRADING/DEGRADING MOBILE CHANNELS I: MODEL DEVELOPMENT |
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| En-Tian LIN Chih-Tsung HSU Keh-Chia YEH.DEPTH-INTEGRATED MODELING FOR AGGRADING/DEGRADING MOBILE CHANNELS I: MODEL DEVELOPMENT[J].International Journal of Sediment Research,2006,21(4):281-293. |
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| Authors: | En-Tian LIN Chih-Tsung HSU Keh-Chia YEH |
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| Abstract: | A depth-integrated model has been developed to simulate the alluvial process of channel bed under overloading and under-loading sediment discharge conditions. The hydrodynamic sub-model based on the explicit-finite-analytic method is used to obtain the flow field. Then the sediment transport modes, including the bed-load and suspended load, are modeled with the aid of the empirically auxiliary relations. In the depth-integrated model, the sediment exchange rate is treated as a source term specified at the reference level, rather than a boundary condition as usually adopted in vertical 2-D or 3-D models. The deposition or erosion rate of the bed is then determined by comparing the flow-laden suspended-sediment concentration profile against the equilibrium concentration profile, and their difference is used to compute the sediment exchange rate for a given time interval. Assessment of the good accuracy of the proposed model is demonstrated by using van Rijn's (1981) experiment for the case of clear water passing a movable bed. In the companion paper, the verification and the field application of the proposed model are presented. |
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| Keywords: | Depth-integrated mobile-bed model Sediment exchange rate Non-equilibrium suspended sediment concentration Reference level Mixing layer |
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