A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
The Effect of Grain Size on Rainfall-Triggered Debris Flow in Hydrophobic Granular Slopes
Every year wildfires burn acres of land around the world and in the United States. One of the consequences of wildfires on soil is hydrophobicity, enhancing the surface runoff and erosion that lead to economic disaster, injury, and life loss. A hydrophobic layer builds upon grain surfaces from burned soil organic matter gases during wildfires and depends on the amount of organic matter, soil texture, fire severity, and vegetation type. However, the effect of geomechanical soil properties, such as grain sizes, on mudflows remains unclear. This study relates the grain size distribution with the amount and different patterns of erosion during rain events. Rainfall experiments are conducted on regular and hydrophobic sands with fine, medium, and coarse grains packed in 30° flumes. The results indicate that a higher rate of debris flow occurs in hydrophobic soil, and this amount is affected by the grain size distribution. In the slopes with finer grain, a significant amount of soil mass is collected at the end of the test. In addition, different patterns of flow are identified in slopes with varying sizes of grain. Wider channels form in the coarse-grain slopes, while the primary pattern includes sequin shapes in the fine-grain slope.
The Effect of Grain Size on Rainfall-Triggered Debris Flow in Hydrophobic Granular Slopes
Every year wildfires burn acres of land around the world and in the United States. One of the consequences of wildfires on soil is hydrophobicity, enhancing the surface runoff and erosion that lead to economic disaster, injury, and life loss. A hydrophobic layer builds upon grain surfaces from burned soil organic matter gases during wildfires and depends on the amount of organic matter, soil texture, fire severity, and vegetation type. However, the effect of geomechanical soil properties, such as grain sizes, on mudflows remains unclear. This study relates the grain size distribution with the amount and different patterns of erosion during rain events. Rainfall experiments are conducted on regular and hydrophobic sands with fine, medium, and coarse grains packed in 30° flumes. The results indicate that a higher rate of debris flow occurs in hydrophobic soil, and this amount is affected by the grain size distribution. In the slopes with finer grain, a significant amount of soil mass is collected at the end of the test. In addition, different patterns of flow are identified in slopes with varying sizes of grain. Wider channels form in the coarse-grain slopes, while the primary pattern includes sequin shapes in the fine-grain slope.
The Effect of Grain Size on Rainfall-Triggered Debris Flow in Hydrophobic Granular Slopes
Movasat, Mahta (author) / Tomac, Ingrid (author)
Geo-Congress 2022 ; 2022 ; Charlotte, North Carolina
Geo-Congress 2022 ; 417-424
2022-03-17
Conference paper
Electronic Resource
English
The Effect of Grain Size on Rainfall-Triggered Debris Flow in Hydrophobic Granular Slopes
| British Library Conference Proceedings | 2022
Debris-flow grain-size analysis
| British Library Conference Proceedings | 2000
Rainfall-triggered debris flows following the Wenchuan earthquake
| Online Contents | 2009
Deformation characteristics of unstable shallow slopes triggered by rainfall infiltration
| Online Contents | 2020