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为研究卵砾石床面的粗化过程,选用粒径范围3~50mm的连续级配卵砾石为试验沙,在长17m、宽0.58m、深0.5m的水槽中进行三组不同流量的清水冲刷试验,测算其床面冲刷深度和粗化层级配,分析卵砾石床面在清水冲刷作用下的变化。结果表明,冲刷流速较小时,粗化后的卵砾石床面粗颗粒的排列仅与初始位置有关,而受到强冲刷时则会完全改变床面初始形态;粗化稳定后,床面中间形成凹槽而不形成沙波等地形;针对卵砾石床面的粗化层级配预报方法的预报值与试验值吻合良好。
In order to study the roughening process of the pebble bed, continuous graded gravel with particle size in the range of 3 ~ 50mm was selected as the test sand. Three sets of clear water scouring at different flow rates were carried out in a flume 17m long, 0.58m wide and 0.5m deep. Test, calculate the depth of bed erosion and coarse grading, analysis of the changes of the bed of pebbles in the role of water scouring. The results show that when the flow rate is low, the arrangement of coarse particles on the roughened pebble bed surface is only related to the initial position, while when it is strongly scoured, the initial shape of the bed surface is completely changed. After the roughening and stabilization, the formation of a concave Trough without forming sand wave and other terrain. The predicted value of grading layer grading forecast method for pebble bed is in good agreement with the experimental value.