| 曹兵,刘士和,罗秋实,尹书冉.旁侧入流对绕体流动与河床冲淤变形的影响[J].水利学报,2009,40(11): |
| 旁侧入流对绕体流动与河床冲淤变形的影响 |
| Effect of lateral inflow on main flow characteristics and river bed deformation |
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| DOI： |
| 中文关键词: 旁侧入流 绕体流动 复合模型 峰型系数 河床冲深 |
| 英文关键词: lateral inflow circumfluence hybrid model coefficient of flood wave type depth of river bed scouring |
| 基金项目: |
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| 中文摘要: |
| 采用复合模型技术，以南水北调中线穿七里河倒虹吸工程为例，研究了旁侧入流对绕体流动特性与河床冲淤变形的影响。研究成果表明：工程实施后，如无旁侧入流，裹头上游水位将有所壅高，流速略有降低，工程断面流速有所增加;增加旁侧入流后，受旁侧入流顶托作用，裹头上游的水位壅高值将显著增加，工程附近局部区域内流速也将发生较大的变化。同时考虑旁侧入流与来流非恒定效应的冲刷试验成果表明：裹头附近的河床冲刷深度在涨水期持续增加，并在洪峰时刻附近达到最大值，但在退水期则略有回淤，相对回淤高度与洪水峰型系数有关，峰型系数越大，相对回淤高度也越大。 |
| 英文摘要: |
| In this paper, the hybrid model was adopted to analyze the influence of lateral inflow on main flow characteristics and river bed deformation based on the river flow around the inverted siphon which will be built in South to North Water Transfer Project in the Qili River. The simulation results show that, after the construction of the project, if a lateral inflow doesn't exist, the water level in the upstream of wrapping will be raised and the velocity in the same position will be slightly decreased while that near the cross section of the project will be increased. If the lateral inflow is introduced, the backwater height in the upstream of the wrapping will be markedly enhanced with the jacking effect of lateral inflow and the velocity in local area near the project will be widely changed. The results of scouring experiment simultaneously considered lateral inflow and the unsteady effect of upstream flow show that, the scour depth of river bed around wrapping will continuously increase in rising phase and reach maximum near the peak time, while there will be a little back silting in river bed in dropping phase. Furthermore, the relative altitude of back silting is relevant to coefficient of flood wave type, the larger of the coefficient of the flood wave type, the higher of the relative altitude of the back silting. |
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