Micro-morphological Changes and Erosion Characteristics of Rill on Bare Pisha Sandstone Slope Under Scouring Conditions

LI Long; QIN Fucang; QIAN Qiuying; DONG Xiaoyu; LI Yan

doi:10.13870/j.cnki.stbcxb.2021.05.006

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Micro-morphological Changes and Erosion Characteristics of Rill on Bare Pisha Sandstone Slope Under Scouring Conditions

更新时间：2025-03-12

- Micro-morphological Changes and Erosion Characteristics of Rill on Bare Pisha Sandstone Slope Under Scouring Conditions
- Vol. 35, Issue 5, Pages: 37-43(2021)
- 作者机构：
  
  1. 内蒙古农业大学沙漠治理学院,呼和浩特,100018
  2. 荒漠生态系统保护与修复国家林业和草原局重点实验室,呼和浩特,100018
- 作者简介：
- 基金信息：
- DOI：10.13870/j.cnki.stbcxb.2021.05.006
  CLC： S157.1
- Published：2021
- 稿件说明：
移动端阅览
LI Long, QIN Fucang, QIAN Qiuying, et al. Micro-morphological Changes and Erosion Characteristics of Rill on Bare Pisha Sandstone Slope Under Scouring Conditions[J]. 2021, 35(5): 37-43.
DOI：

LI Long, QIN Fucang, QIAN Qiuying, et al. Micro-morphological Changes and Erosion Characteristics of Rill on Bare Pisha Sandstone Slope Under Scouring Conditions[J]. 2021, 35(5): 37-43. DOI： 10.13870/j.cnki.stbcxb.2021.05.006.

摘要

选择裸露砒砂岩坡面为研究对象，基于野外径流小区冲刷试验结合三维激光扫描技术，研究3种流量（60，100，200 L/h）与4个坡度（5°，10°，20°，30°）组合冲刷下砒砂岩区坡面细沟形态演变特征及径流侵蚀产沙机制。结果表明：坡面细沟在坡下最先发育，随着冲刷流量和坡面坡度的增大而向上延伸；细沟出现的时间随着坡度的增加而缩短；<10°坡面上细沟的形态表现为"宽浅型"，最大宽深比为0.038，>20°坡面细沟的形态为"深窄型"，最小宽深比为0.017；随着冲刷强度和坡度的增加，细沟宽深比变小，而细沟数量、细沟密度、细沟复杂度、细沟割裂度等指标均增大。坡度和冲刷强度共同影响着坡面产沙率变化，随着坡度和冲刷强度的提升坡面产沙率表现为先增后减的趋势。细沟宽深比与坡面产沙量呈现极显著负相关（-0.935，P<0.01），细沟密度与细沟割裂度与产沙量呈显著正相关关系（0.888，0.944，P<0.01）。

Abstract

Taking bare Pisha Sandstone slope as the research object

based on the field runoff plot scouring test and three-dimensional laser scanning technology

the evolution of rill micro morphology and erosion sediment yield mechanism on Pisha Sandstone slope were studied under combined erosion with three kinds of flow (60

100 and 200 L/h) and four slopes (5°

10°

20° and 30°). The results showed that the rill developed first at the bottom of the slope and then extended upward with the increasing of scouring flow and slope gradient. The occurrence time of rill decreased with the increasing of slope gradient. The rill shape was "wide and shallow type" on the slope less than 10°

the maximum width to depth ratio was 0.038. While the rill shape was "deep and narrow type" on the slop more than 20°

the minimum width to depth ratio was 0.038. With the increasing of erosion intensity and slope gradient

the ratio of rill width to depth became smaller

while the number

density

complexity and fragmentation of rill increased. Slope gradient and scouring intensity affected the change of slope sediment yield together. With the increasing of slope gradient and scouring intensity

the sediment yield increased first and then decreased. There was a significant negative correlation between ratio of rill width to depth and slope sediment yield (-0.935

P<0.01)

and a significant positive correlation between rill density

rill fragmentation and sediment yield (0.888

0.944

P < 0.01).

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