Hydrodynamic Characteristics of the Formation Processes for Non-Homogeneous Debris-Flow

Non-homogeneous debris flows are characterized by a wide grain size gradation, high volumetric weight and sediments not uniformly distributed along the vertical direction of the flow depth. These flows usually occur in the southwestern mountainous area of China during the rainy season, causing tangi...

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Bibliographic Details
Published inWater (Basel) Vol. 10; no. 4; p. 452
Main Authors Shu, An, Tian, Lu, Wang, Shu, Rubinato, Matteo, Zhu, Fuyang, Wang, Mengyao, Sun, Jiangtao
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.04.2018
Subjects
Advertising campaigns
Composition
debris-flow
Detritus
Dynamic characteristics
Earthquakes
Evaluation
Experiments
Flow rates
formation
Grain size
Grain size distribution
hydrodynamic
Laboratories
Landslides & mudslides
movement
non-homogeneous
Parameters
Particle size
Pore water
Pore water pressure
Propagation
Propagation velocity
Rainy season
Sediments
Sediments (Geology)
Velocity
Water pressure
China
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Summary:Non-homogeneous debris flows are characterized by a wide grain size gradation, high volumetric weight and sediments not uniformly distributed along the vertical direction of the flow depth. These flows usually occur in the southwestern mountainous area of China during the rainy season, causing tangible and non-tangible damages; therefore, it is crucial to study their dynamic characteristics. An experimental campaign was conducted to replicate three processes typical of debris flows: (i) formation; (ii) propagation; and (iii) accumulation. Different flow rates, soil composition and flume slopes were applied. Multiple experimental parameters were quantified for each test conducted such as pore water pressure and velocity and a series of regression analyses were used to determine the relative impact of each experimental variable on these recorded parameters. The results showed that the flowrate and the vertical grading coefficient associated with the soil composition have the maximum and the minimum influence on the formation of debris flows and propagation velocities measured, respectively. This result is significant and needs to be considered when planning or designing control measures to reduce the impacts of debris flows.
ISSN:2073-4441
2073-4441
DOI:10.3390/w10040452