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Effect of Topographic Condition of Drainage Channel on the Interaction Between Granular Flow and Slit Dams

Author

Listed:
  • Jiajia Feng

    (Department of Civil Engineering, School of Engineering, Tibet University, Lhasa 850000, China)

  • Chengye Yang

    (Department of Civil Engineering, School of Engineering, Tibet University, Lhasa 850000, China)

  • Chongyang Bu

    (Department of Civil Engineering, School of Engineering, Tibet University, Lhasa 850000, China)

  • Yangyang Xia

    (Department of Civil Engineering, School of Engineering, Tibet University, Lhasa 850000, China)

  • Gen Zhang

    (Department of Civil Engineering, School of Engineering, Tibet University, Lhasa 850000, China)

Abstract

One of the most dangerous geological disaster risks in mountainous areas is granular flow. Slit dams, which might partially block the granular flow and let downstream flow at a slower speed, have been crucial in reducing the geohazards associated with granular flow. In this work, the discrete element method (DEM) was used to explore the effect of the topographic condition of drainage channels, including slope angle and cross-section types, on the interaction between granular flows and slit dams. The interactions dynamic process between the dry granular flows and slit dams with different drainage channel cross-section types has been investigated. And the simulation results demonstrate the significance of taking drainage channel cross-section types into account when designing barriers, particularly slit dams. The flow process, particularly in channels with V-shaped and trapezoidal sections, is characterized by a more rapid movement and larger final accumulation length, potentially resulting in increased impact force on the downstream slit dams. Moreover, the cross-section types and slope angles jointly influence the regulation function and impact force. The dry granular flow in the drainage channel with a V-shaped cross-section leads to a smaller normal impact force and retention efficiency. Taking into account the complexity of construction, retention efficiency, and impact force, it can be concluded that a trapezoid shape is the most appropriate option from an engineering perspective. This research may add to the understanding of the relationship between granular flow and slit dams and help the engineering design of slit dams with scientific evidence.

Suggested Citation

  • Jiajia Feng & Chengye Yang & Chongyang Bu & Yangyang Xia & Gen Zhang, 2025. "Effect of Topographic Condition of Drainage Channel on the Interaction Between Granular Flow and Slit Dams," Sustainability, MDPI, vol. 17(4), pages 1-16, February.
  • Handle: RePEc:gam:jsusta:v:17:y:2025:i:4:p:1649-:d:1592643
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