Sensitivity of rainstorm-triggered shallow mass movements on gully slopes to topographical factors on the Chinese Loess Plateau(第一作者郭文召是项目组核心成员、申请人是郭文召的博士导师)
Sensitivity of rainstorm-triggered shallow mass movements on gully slopes to topographical factors on the Chinese Loess Plateau(第一作者郭文召是项目组核心成员、申请人是郭文召的博士导师)
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DOI：
10.1016/j.geomorph.2019.04.006
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发表时间：
2019
期刊：
影响因子：
3.9
通讯作者：
Yang Bo
中科院分区：
文献类型：
--
作者：
Guo Wenzhao;Luo Li;Wang Wenlong;Liu Zhenyi;Chen Zhuoxin;Kang Hongliang;Yang Bo
地形因素是理解黄土高原沟壑坡面浅层质点运动形成机制的重要因素之一，中国。然而，人们对沟壑斜坡上浅层质量运动对地形的敏感性知之甚少。通过一系列降雨模拟试验，定量探讨了黄土高原天然黄土坡面坡高(1.0和1.5 m)和坡度(60°和70°)对浅层质量运动的影响。我们的研究利用地形仪观测了未受扰动的斜坡上的浅层质量运动过程，收集的数据很好地反映了这一过程的性质。与通常用于回填土实验室测试的传统方法相比，进行的研究具有优势。结果表明，随着坡高和坡度的增加，浅层质量移动量增加。浅层质量运移速率(即重力侵蚀速率)随坡度从1 m增加到1 5 m增加约3~8倍，随着坡度从60°增加到70°增加约148%~52 5%。坡度对浅层质量运动的敏感系数是坡高对浅层质量运动敏感系数的2.1倍。相对于滑坡和崩塌，坡度对泥石流的影响最大，而坡度对滑坡的影响最大。我们的结果为自然灾害易感性评估和控制侵蚀过程提供了见解。
Topographical factor is one of the most important factors in understanding the formation mechanism of shallow mass movements on gully slopes on the Loess Plateau, China. However, the sensitivity of shallow mass movements on gully slopes to topography is poorly understood. Here, a series of rainfall simulation experiments was performed to quantitatively explore the influences of slope height (1.0 and 1.5 m) and gradient (60° and 70°) on shallow mass movements on the natural loess slopes on the Loess Plateau. Our research observed shallow mass movement processes on undisturbed slopes by using a Topography Meter and collected data that well reflected the nature of the processes. The conducted study has advantageous over traditional methods that are usually used in laboratory tests of backfilled soil. Results showed that the amount of shallow mass movement increased with increased slope height and gradient. The shallow mass movement rates (i.e., gravity erosion rates) increased by approximately 3–8 times with increased slope height from 1.0 m to 1.5 m, and increased by 148%–525% with increased slope gradient from 60° to 70°. The sensitivity coefficient of slope gradients for shallow mass movements was 2.1 times larger than that of slope heights for the shallow mass movements. Slope heights had the greatest effect on earthflow relative to slide and avalanche, whereas slope gradients had the greatest effect on slide. Our results provided insights into natural hazard susceptibility assessment and control erosion processes.