护滩带边缘局部冲刷深度计算公式初步研究

发布时间：2018-04-18 03:31

本文选题：护滩带 + 局部冲刷　；参考：《泥沙研究》2017年02期

【摘要】：长江航道整治工程广泛采用软体排护滩,简称护滩带,当护滩带边缘压载结构不同时,边缘外的局部冲刷会发生变化。采用水槽试验的方法,研究了不同压载体护滩带边缘的局部冲刷规律。研究发现,护滩带边缘冲刷深度随水流流速与泥沙起动流速之比的增加而增大;当排体外不铺设压载体时,排体上压载体透水率越大,局部冲刷深度也越大;当排体外铺设压载体时,局部冲刷深度随压载体铺设宽度的增大呈先减小,后变化不大的特点;当排体上压载体结构和排体外压载宽度相同时,排体外压载体透水率越大,局部冲刷深度也越大。依据试验资料,选取反映水流、河床及压载结构条件的因子,建立了具有一定精度的计算排体护滩带边缘局部冲刷深度的经验公式。
[Abstract]:Soft drainage beach protection zone is widely used in Yangtze River waterway regulation project. When the ballast structure at the edge of the beach protection zone is different, the local scour outside the edge will change.The flume test method is used to study the local scour law of the edge of the beach belt with different pressure carriers.It is found that the edge scour depth increases with the increase of the ratio of water flow velocity to sediment starting velocity, and when the pressure carrier is not laid outside, the greater the permeation rate of the pressure carrier is, the greater the local scour depth is.When the external pressure carrier is laid, the local scour depth decreases first and then changes little with the increase of the width of the pressure carrier, and when the structure of the pressure carrier is the same as the outside ballast width, the water permeation rate of the external pressure carrier increases.The greater the depth of local scour.Based on the experimental data, the factors reflecting the flow, river bed and ballast structure conditions are selected, and an empirical formula for calculating the local scour depth at the edge of the watersheds with certain accuracy is established.
【作者单位】：武汉大学水资源与水电工程科学国家重点实验室;
【基金】：国家自然科学基金资助项目(11472199)
【分类号】：U617

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