水槽近底流速分布与推移质输移特性研究

发布时间：2018-04-22 22:36

本文选题：响应关系 + 近底流速　；参考：《人民黄河》2017年06期

【摘要】：通过开展水槽试验,利用ADV测速及高速摄像技术采集了近壁区的流速及紊动特征值,分条带计量了推移质输移情况。通过对比横向密布测点的流速结构差异,剖析了近底流速分布的变化特点与两侧的流速结构变异。基于输沙分条带量化观测模式,对推移质输移的空间横向分布特性进行了分析。结果表明:(1)近底流速的相对脉动强度呈现中间区域最大并向两侧递减的趋势,在临近侧壁处有突变波动现象,这与近底流速的横向分布在侧壁附近的突变特点相互对应;(2)推移质输移在横向分布上不均匀,整体呈从中间向两侧逐渐递减的趋势,80%的区域基本完成了断面的总输沙量,近侧壁区域输沙受边壁影响较明显;(3)近底流速横向分布、近底水流脉动强度与相对输沙强度的横向分布存在响应协同性。
[Abstract]:Through the flume test, the velocity and turbulence characteristic values of the near wall area were collected by using ADV velocimetry and high speed camera technology, and the bed load transport was measured by strip. By contrasting the difference of velocity structure of transverse dense measuring points, the variation characteristics of near bottom velocity distribution and the variation of velocity structure on both sides are analyzed. Based on the quantitative observation model of sediment transport belt, the spatial transverse distribution characteristics of bed load transport are analyzed. The results show that the relative pulsation intensity of the near bottom velocity shows a trend of maximum in the middle region and decreasing to both sides, and there is a sudden fluctuation phenomenon near the lateral wall. This corresponds to the abrupt change in the lateral distribution of near bottom velocity near the lateral wall.) the horizontal distribution of bed load is not uniform, and the total sediment transport of the cross section is basically completed in an area with an overall decreasing trend from the middle to the two sides. The lateral distribution of near bottom velocity is obviously influenced by the lateral wall, and the lateral distribution of the fluctuation intensity of near-bottom flow and the relative intensity of sediment transport are synergistic.
【作者单位】：华北水利水电大学水利学院;西安理工大学水利水电学院;
【基金】：国家自然科学基金重点项目(51039004)
【分类号】：TV142.2

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