Experimental Study on Loess Mudflow Induced by Rainfall in Yan'an Area

CHEN Hai-xia; WANG Jia-ding

您当前的位置：

首页 >

文章列表页 >

Experimental Study on Loess Mudflow Induced by Rainfall in Yan'an Area

- Experimental Study on Loess Mudflow Induced by Rainfall in Yan'an Area
- Bulletin of Soiland Water Conservation Vol. 32, Issue 2, Pages: 39-42(2013)
- 作者机构：
  
  西北大学地质学系大陆动力学国家重点实验室,陕西,西安,710069
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published：2013
- 稿件说明：
移动端阅览
CHEN Hai-xia, WANG Jia-ding. Experimental Study on Loess Mudflow Induced by Rainfall in Yan'an Area[J]. Bulletin of Soiland Water Conservation, 2013, 32(2): 39-42.
DOI：

CHEN Hai-xia, WANG Jia-ding. Experimental Study on Loess Mudflow Induced by Rainfall in Yan'an Area[J]. Bulletin of Soiland Water Conservation, 2013, 32(2): 39-42. DOI：

摘要

在野外模拟降雨条件下

研究了黄土粒度分布和微结构在降雨前后的变化及其对泥流启动的影响。结果表明

采自径流沉积物的降雨后土样中的细黏粒、粗黏粒体积含量分别相对增加了22%和18%

而粗粉粒、微砂体积含量分别相对减少了7.6%和3.3%。坡面残余土的粒度"粗化"

降雨后土骨架连接松散

这些由降雨引起的黄土的粒度和微结构变化说明降雨后黄土的抗剪强度和抗压能力将降低

导致泥流启动的可能性增加。随着降雨入渗

当沿坡面的黄土重力分力与抗剪强度间的平衡被打破

黄土开始滑移并发展成泥流。有效防止坡面土粒度"粗化"是遏制水土流失的关键。

Abstract

The changes of grain size distribution and microstructure of loess after rainfall were investigated inthis study

as well as their effects on the initiation of mudflow.A simulated rainfall experiment was conducted in field for this purpose.We found that after rainfall

the volumetric percentages of fine and rough clayparticles increase approximately 22% and 18%

and those of silt and fine sand decreased 7.6%and 3.3%

respectively

in the samples collected from the sediment deposits.Consequently

the grain size of residual loess on the slope coarsened and the connection of loess skeleton became loose after rainfall.Such changes ofgrain size and microstructure of loess induced by rainfall implies that both of the shear and pressure resistanceof loess will decrease after rainfall.Thus

the probability of the mudflow initiation increases.Once the balance between the gravitational component of loess along the slope and the shear resistance is broken as therainfall penetrates

the loess begins to slip and possibly develops into mudflow.Preventing the loess on theslope effectively from being coarsened is the key to mitigate water loss and soil erosion.

关键词

Keywords

references

Views

1391

下载量

CSCD

Alert me when the article has been cited

提交

Tools

Publicity Resources

Grain-Size Fractal Characteristics of Fluvial Sediment in Xianyang Section of Weihe River

Grain Size Characteristics and Their Significance for Surface Sediment of Paleochannels Along Main Stream of Tarim River

Grain Size Cycle Characteristics of Flood Sediments at Loess Depression Check Dam During 1953-2010

Spatial correlation networks and influencing factors of urban land green utilization efficiency in three major urban agglomerations of Yellow River basin

Coupling coordination relationship between urbanization and ecosystem service value in Lanzhou-Xining urban agglomeration

Related Author

SHI Xing-min

HAN Yan

LI Kai-feng

MU Gui-jin

XU Li-shuai

PAN Guang-yao

YAN Yan

YUE Da-peng

Related Institution

College of Tourism and Environment Science, Shaanxi Normal University, Xian

College of Earth Science,Chengdu University of Technology

Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences

Graduate University of the Chinese Academy of Sciences

Cele National Station of Observation and Research for Desert—Grassland Ecosystem in Xinjiang, Cele

⁰