| Longitudinal variations of hydraulic characteristics of overland flow with different roughness简 |
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| 引用本文： | 王协康,闫旭峰,周苏芬,黄尔,刘兴年.Longitudinal variations of hydraulic characteristics of overland flow with different roughness简[J].水动力学研究与进展(英文版),2014,26(1):66-74. |
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| 作者姓名： | 王协康 闫旭峰 周苏芬 黄尔 刘兴年 |
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| 基金项目： | Project supported by the National Natural Science Foundation of China （Grant No. 41171016）. Acknowledgements This work was supported by the Yangtze River Scientific Research Institute Open Research Program （Program SN. CKWV2012313/KY）, the Open Foundation of State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University （Grant No. 1008）. |
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| 摘 要： | The evolution of the overland flow velocity along the distance downslope on smooth and granular beds in different cases is investigated by means of the electrolyte tracer via flume experiments.The results demonstrate that a non-uniform flow regime and a uniform flow regime exist in the development process of the overland flow.Owing to the different attributes of beds’roughness,the position of those zones with different flow regimes varies correspondingly:(1)the overland flow on granular beds enters into the uniform regime much sooner,additionally,the roll waves tend to appear because of the presence of the proper flow resistance imparted by the roughness(coarse sands),and large slopes(20o and 25o)which makes the flow velocities and depths to undulate spatially.Furthermore,the flow resistance of the overland flows with different roughness elements,that is the non-sands,the fine sands and the coarse sands,is calculated.A quadratic interpolation method of the third order accuracy is employed in the calculation of the longitudinal flow resistance.The results show that it is rational to use the bed slope to approximate the hydraulic energy slope over a relative small roughness(the present roughness),however on the other hand,if the mean flow velocities and depths rather than the local parameters are used to calculate the flow resistance,a considerable error will be induced within the non-uniform regime of the overland flows,including the acceleration zone and the roll-wave zone.
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| 关 键 词： | 粗糙度 坡面流 水力特性 非均匀体系 流动状态 流动阻力 租金 水槽实验 |
| 收稿时间： | 8 October 2012 |
Longitudinal variations of hydraulic characteristics of overland flow with diffe-rent roughness |
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| WANG Xie-kang,YAN Xu-feng,ZHOU Su-fen,HUANG Er,LIU Xing-nian.Longitudinal variations of hydraulic characteristics of overland flow with diffe-rent roughness[J].Journal of Hydrodynamics,2014,26(1):66-74. |
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| Authors: | WANG Xie-kang YAN Xu-feng ZHOU Su-fen HUANG Er LIU Xing-nian |
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| Affiliation: | [1]State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu 610065,China [2]Yangtze River Scientific Research Institute, Wuhan 430010, China [3]Department of Civil and Structural Engineering, The Hong Kong Polytechnic University, Hong Kong, China |
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| Abstract: | The evolution of the overland flow velocity along the distance downslope on smooth and granular beds in different cases is investigated by means of the electrolyte tracer via flume experiments. The results demonstrate that a non-uniform flow regime and a uniform flow regime exist in the development process of the overland flow. Owing to the different attributes of beds' roughness, the position of those zones with different flow regimes varies correspondingly: (1) the overland flow on granular beds enters into the uniform regime much sooner, additionally, the roll waves tend to appear because of the presence of the proper flow resistance imparted by the roughness (coarse sands), and large slopes (20° and 25°) which makes the flow velocities and depths to undulate spatially. Furthermore, the flow resistance of the overland flows with different roughness elements, that is the non-sands, the fine sands and the coarse sands, is calculated. A quadratic interpolation method of the third order accuracy is employed in the calculation of the longitudinal flow resistance. The results show that it is rational to use the bed slope to approximate the hydraulic energy slope over a relative small roughness (the present roughness), however on the other hand, if the mean flow velocities and depths rather than the local parameters are used to calculate the flow resistance, a considerable error will be induced within the non-uniform regime of the overland flows, including the acceleration zone and the roll-wave zone. |
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| Keywords: | overland flow longitudinal hydraulic characteristics flow resistance quadratic interpolation |
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