...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Effects of hydrophobicity on splash erosion of model soil particles by a single water drop impact
【24h】

Effects of hydrophobicity on splash erosion of model soil particles by a single water drop impact

机译：疏水性对单滴水冲击对模型土壤颗粒飞溅侵蚀的影响

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Raindrop impact can be a major contributor to particle mobilization for soils and other granular materials. In previous work, water repellent soils, comprised of hydrophobic particles, have been shown to exhibit greater splash erosion losses under multiple drop impact. However, the underlying principle differences in splash behavior between hydrophobic and hydrophilic granular surfaces have not been studied to date. In this study the effects of particle hydrophobicity on splash behaviour by a single water drop impact were examined using high-speed videography. Water drops (4mm in diameter) were dropped on beds of hydrophilic and hydrophobic glass beads (sieved range: 350-400 μm), serving as model soil particles. The drop velocity on impact was 2.67ms~(-1), which corresponds to~30% of the terminal velocity of a raindrop of similar size. The resulting impact behaviour was measured in terms of the trajectories of particles ejected from the beds and their final resting positions. The response to the impacting water drop was significantly different between hydrophilic and hydrophobic particles in terms of the distance distribution, the median distance travelled by the particles and number of ejected particles. The greater ejection distances of hydrophobic particles were mainly the result of the higher initial velocities rather than differences in ejecting angles. The higher and longer ejection trajectories for hydrophobic particles, compared with hydrophilic particles, indicate that particle hydrophobicity affects splash erosion from the initial stage of rainfall erosion before a water layer may be formed by accumulating drops. The~10% increase in average splash distance for hydrophobic particles compared with hydrophilic particles suggests that particle hydrophobicity can result in greater net erosion rate, which would be amplified on sloping surfaces, for example, by ridges in ploughed agricultural soils or hillslopes following vegetation loss by clearing or wildfire.
机译：雨滴的影响可能是动员土壤和其他颗粒物质的颗粒的主要因素。在以前的工作中，由疏水性颗粒组成的拒水污垢在多次滴落冲击下表现出更大的飞溅侵蚀损失。但是，迄今为止，尚未研究疏水性和亲水性颗粒表面之间飞溅行为的根本原理差异。在这项研究中，使用高速摄影技术检查了单次水滴撞击对颗粒疏水性的影响。将水滴（直径为4mm）滴在亲水性和疏水性玻璃珠（筛分范围：350-400μm）的床上，作为模型土壤颗粒。撞击时的下落速度为2.67ms〜（-1），相当于类似大小的雨滴最终速度的〜30％。根据从床中喷出的颗粒的轨迹及其最终的静止位置来测量所产生的冲击行为。就距离分布，粒子行进的中位距离和喷射的粒子数而言，亲水性粒子和疏水性粒子对撞击水滴的响应明显不同。疏水性颗粒的较大喷射距离主要是较高的初始速度而不是喷射角度不同的结果。与亲水性颗粒相比，疏水性颗粒的喷射轨迹更长和更长，这表明颗粒的疏水性会从降雨侵蚀的初始阶段影响飞溅侵蚀，然后才可能通过堆积水滴形成水层。与亲水性颗粒相比，疏水性颗粒的平均飞溅距离增加了约10％，这表明颗粒疏水性可导致更大的净侵蚀率，这会在倾斜的表面上被放大，例如，耕作后的农业土壤或山坡上由于植被丧失而形成的山脊通过清除或野火。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号