Dynamics of loose granular flow and its subsequent deposition in a narrow mountainous river

Lei, Ming; Xu, Ze-xing; Zhao, Tao; Wang, Xiekang

doi:10.1007/s11629-018-5080-5

Cited by 12 publications

(1 citation statement)

References 50 publications

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“…For a calculation cycle, the fluid field is calculated based on the updated two-phase interaction forces by adding a source term to the fluid momentum equation. Different time steps setting in CFD and DEM will improve the efficiency of the coupling model significantly (Lei et al, 2019). In this study, the ratio was set at 1: 100.…”

Section: Fluid-particle Interactionsmentioning

confidence: 99%

Numerical Simulation of Slope–Gully–Stream Sediment Transport Process with Water and Gravity Erosion

2022

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Soil erosion has become a global problem with serious consequences. It is the source of sediment in rivers, and the subsequent sediment transport is important. Water erosion and gravity erosion, as common forms of soil erosion, have different subsequent sediment transport processes. Numerical simulations can reflect these processes well under different sediment yield types. This study applied the computational fluid dynamics and discrete element method (CFD-DEM) to examine the sediment transport following water erosion and gravity erosion. During the sediment transport process, the solid-phase particles in the gravity erosion case move at a greater speed during the initial stage. In the case of water erosion, a decrease in particle velocity on the slope occurs due to the accumulation of particles. The streamwise velocity distribution of the liquid phase conforms to the logarithmic distribution before the sediment transport process starts. Influenced by the solid-phase particles, the flow velocity near the bottom decreases significantly. The sediment transport rate peak in gravity erosion cases is greater than that in water erosion cases. Furthermore, in water erosion cases, when the slope is steep, there is no peak in the sections located at the inlet and outlet of a gully. The sediment transport rate in river sections shows a step form in the declining process.

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Section: Fluid-particle Interactionsmentioning

confidence: 99%

Numerical Simulation of Slope–Gully–Stream Sediment Transport Process with Water and Gravity Erosion

2022

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Development and application of an integrated methodology for post‐disaster field investigation of debris floods

Po,

Xiekang,

Dongya

et al. 2024

Earth Surf Processes Landf

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Debris floods commonly occur in steep channels with an abundant sediment supply, and they can cause significant damage, primarily due to their higher sediment concentrations and negative impacts upon bank erosion, deep scouring and aggradation. These key hazards pose challenges for traditional assessment methods, making quantification difficult. This became obvious during a recent catastrophic debris flood that occurred on July 12, 2022, in the Heishuigou catchment (102 km2), northern Sichuan Province, China. In this case study, we developed an integrated methodology for assessing this debris flood event by incorporating field surveys, hydrological and hydraulic modelling and sediment transport calculations. Detailed information such as topographic maps, photographs, deposits, grain size distributions and inundation depths was collected to analyse the material sources, validate the parameters and conduct model calculations. The peak debris flood discharge and the supra‐critical bed shear stress ratios, estimated from hydrological and dynamic models, were incorporated to analyse the debris flood's typology and characterize its destructive mechanisms. The regional frequency–volume relationship established through bedload transport calculations was calibrated using the volume of the deposits determined via field investigation. These methods not only contribute to a comprehensive understanding of debris floods but also provide valuable support for future risk assessments and mitigation designs.

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Mesoscale Analysis of Flash Flood and Sediment Disasters

2020

Mesoscale Analysis of Hydraulics

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Dynamics of loose granular flow and its subsequent deposition in a narrow mountainous river

Cited by 12 publications

References 50 publications

Numerical Simulation of Slope–Gully–Stream Sediment Transport Process with Water and Gravity Erosion

Numerical Simulation of Slope–Gully–Stream Sediment Transport Process with Water and Gravity Erosion

Development and application of an integrated methodology for post‐disaster field investigation of debris floods

Mesoscale Analysis of Flash Flood and Sediment Disasters

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