Preprints
https://doi.org/10.5194/esurf-2022-38
https://doi.org/10.5194/esurf-2022-38
 
26 Jul 2022
26 Jul 2022
Status: this preprint is currently under review for the journal ESurf.

Influences of Slope Angle on Propagation and Deposition of Laboratory Landslides

Yan-Bin Wu1,2, Zhao Duan2,3, Jian-Bing Peng4,5, and Qing Zhang1,2 Yan-Bin Wu et al.
  • 1Graduate Student, College of Geology and Environment, Xi’an University of Science and Technology, Xi’an 710054, China
  • 2Institute of Ecological Environment Restoration in Mine Areas of West China, Xi’an University of Science and Technology, Xi’an, 710054, China
  • 3Associate Professor, College of Geology and Environment, Xi’an University of Science and Technology, Xi’an 710054, China
  • 4School of geology engineering and Geomatics, Chang’an University, Xi’an 710054, China
  • 5Key Laboratory of western Mineral Resources and Geological Engineering of Ministry of Education, Chang’an University, Xi’an 710054, China

Abstract. Slope angle is an important influence on the motion characteristics and deposit morphologies of landslides. In this study, an advanced 3D scanner was used to study laboratory landslides at various slope angles. The laboratory landslides had different motion characteristics. An increase of the runout of the laboratory landslides with the slope angles meant that the amount of energy loss was great due to the collision of sliding mass at the slope break. The length and area of these laboratory landslides increased first and then decreased during their whole motion. The surface morphologies of the deposits differed according to the slope angles. At low slope angles, they exhibited a series of transverse ridges formed by overthrusting. At moderate slope angles, they exhibited conjugate troughs (X-shape wash) formed by shearing on the accumulation zone. At high slope angles, they exhibited a double-upheaval morphology formed by the rear portion of the sliding mass impacting the forward portion. A theoretical relationship between the apparent friction coefficient and slope angle is proposed, based on a hypothesis the ratio of energy dissipation occurring when an object collides with a plane is exponentially related to the acute angle between the object’s direction and the plane’s normal direction. The study will support studies on the morphological variation during the whole motion and mobility of landslides.

Yan-Bin Wu et al.

Status: open (until 06 Sep 2022)

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Yan-Bin Wu et al.

Yan-Bin Wu et al.

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Short summary
Landslides as a kind of natural hazards are often observed on the earth. The slope angle is a key influence to their motion characteristics and deposit morphologies. In the paper, the different surface morphologies of the deposits were explained by combining their motion process. A theoretical relationship between landslides' mobility and slope angle is re-deduced based on energy conservation. The curve plotted by this formula is approximating to the experimental data of this and other studies.