[1]GAO Hang,XU Xiangzhou,XIAO Peiqing,et al.Effects of Vegetation on Scale and Rate of Gravity Erosion on the Gully Sidewall Under Heavy Rainfalls[J].Research of Soil and Water Conservation,2021,28(06):17-24.
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Effects of Vegetation on Scale and Rate of Gravity Erosion on the Gully Sidewall Under Heavy Rainfalls
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
28
Number of periods:
2021 06
Page number:
17-24
Column:
Public date:
2021-10-10
- Title:
- Effects of Vegetation on Scale and Rate of Gravity Erosion on the Gully Sidewall Under Heavy Rainfalls
- Keywords:
- rainfall simulation; gravity erosion; vegetation; gravity erosion rate; sidewall of loess gully
- CLC:
- S157.1
- DOI:
- -
- Abstract:
- In order to demonstrate the mechanism of the effects of the vegetation on the gravity erosion from the gully sidewall，a series of rainfall-simulation experiments were conducted on seven conceptual landforms with a height of 1.5 m，gentle upper slope of 3°，steep lower slope of 70°，and different coverage types of shrubs. The results showed that:(1)under heavy rain conditions，the vegetation coverage on the gully sidewall played a certain role in delaying the occurrence of mass failure; the average times for the first event of gravity erosion on bare-land models(BLMs)and shrubland models(SLMs)were 30.6 min and 35.1 min，respectively;(2)vegetation on the gully sidewall reduced the volume of the extremely large-scale gravity erosion and increased the frequency of small-scale erosion;(3)shrubs increased the rate of the gravity erosion in the short term，and slowed the down development of gravity erosion in the long term; the maximum rate of the gravity erosion on SLMs was 3 times of that on the BLMs，but the average rate of the gravity erosion on the SLMs was lower than that on the corresponding BLMs，of which the average values were 4.13，5.11 cm3/(m2·s)，respectively;(4)the vegetation arranged near the junction of the steep slope and gentle slope(gully-edge line)had a certain promotion effect on the intensity and rate of gravity erosion; the maximum and average rates of the gravity erosion on the SLMs with the vegetation coverage near the gully edge line were 7.6 and 1.3 times of those under no vegetation，respectively;(5)the intensity and rate of gravity erosion on the SLMs with Forsythia suspensa coverage were higher than those with Kerria japonica coverage. Hence，planting vegetation with smaller rhizomes far away from the gully-edge line together with structural practices can help to prevent the gravity erosion on the gully sidewall in the initial stage of vegetation restoration.
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Last Update:
2021-10-10