Effect of Single Particle Droplet Splash on Sediment Inapient Motion Initiation

LU Zeyang; PENG Qing'e; ZHAO Yuqi; ZHANG Ruixue

doi:10.13870/j.cnki.stbcxb.2022.04.006

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Effect of Single Particle Droplet Splash on Sediment Inapient Motion Initiation

更新时间：2025-03-12

- Effect of Single Particle Droplet Splash on Sediment Inapient Motion Initiation
- Vol. 36, Issue 4, Pages: 37-42(2022)
- 作者机构：
  
  四川大学水力学与山区河流开发保护国家重点实验室,成都,610065
- 作者简介：
- 基金信息：
- DOI：10.13870/j.cnki.stbcxb.2022.04.006
  CLC： TV149.1
- Published：2022
- 稿件说明：
移动端阅览
LU Zeyang, PENG Qing'e, ZHAO Yuqi, et al. Effect of Single Particle Droplet Splash on Sediment Inapient Motion Initiation[J]. 2022, 36(4): 37-42.
DOI：

LU Zeyang, PENG Qing'e, ZHAO Yuqi, et al. Effect of Single Particle Droplet Splash on Sediment Inapient Motion Initiation[J]. 2022, 36(4): 37-42. DOI： 10.13870/j.cnki.stbcxb.2022.04.006.

摘要

通过室内模拟降雨试验，探究单颗粒液滴飞溅对泥沙颗粒起动的影响。试验共设计4种地表坡度（0，15°，25°，35°）及4种粒径的均匀沙（0.098~0.104，0.104~0.5，0.5~0.78，1~1.4 mm），选取当量直径为4.5 mm的液滴进行模拟试验，同时利用高吸水树脂材料泡发后的水球作为对照组。结果表明，颗粒直径和坡度的变化对颗粒起动的影响较为显著，飞溅子液滴对液滴溅蚀具有重要意义。随着颗粒直径的增大，颗粒的起动逐渐由液滴冲击和子液滴飞溅裹挟共同作用转变为液滴冲击动能传递为主，飞溅携带为辅。当颗粒直径相同时，坡度的增大导致飞溅沙粒不再均衡，斜坡下方的颗粒飞溅量和位移随坡度的增大而增大。坡度越大，下方颗粒溅蚀深度与上方的差距也越大，导致上方颗粒失去支撑，整体失稳垮塌，发生微小滑坡。同种粒径时，树脂水球溅蚀坑的宽深比明显小于相同直径的液滴溅蚀坑，液滴溅蚀量远大于树脂水球直接撞击作用下起动的颗粒量，子液滴的拖曳对颗粒起动具有重要意义。

Abstract

The effect of single-particle droplet splash on sediment incipient motion was investigated through indoor simulated rainfall test. Four surface slopes (0

15°

25°

35°)

four particle sizes of uniform sand (0.098-0.104 mm

0.104-0.5 mm

0.5-0.78 mm

1-1.4 mm) and droplets with equivalent diameter of 4.5 mm were designed in the test. The designed water-elastic water balloons made of super absorbent resin were used as the control group. The results showed that the changes of particle diameter and slope had a significant effect on particle's initiation

and the splasher droplets were of great significance to droplet splash erosion. With the increase of particle diameter

the sediment incipient motion gradually changed from the joint action of droplet impact and sub droplet splash to the transfer of droplet impact kinetic energy

supplemented by splash carrying. When the particle diameter was the same

the increase of slope led to the non-equilibrium of splashed sand particles

and the amount and displacement of particle splashing under the slope increased with the increase of slope. The greater the slope

the greater the gap between the splash erosion depth of the particles below and above

resulting in the loss of support of the particles above

overall instability and collapse

and micro landslide. When the particle size was the same

the width depth ratio of the water-bomb splash pit was significantly smaller than that of the droplet splash pit with the same diameter

and the amount of droplet splash was much larger than the number of particles started under the direct impact of the water bomb. The drag of sub droplets affected the particle's initiation significantly.

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