This preprint is under consideration at Natural Hazards. A preprint is a preliminary version of a manuscript that has not completed peer review at a journal. Research Square does not conduct peer review prior to posting preprints. The posting of a preprint on this server should not be interpreted as an endorsement of its validity or suitability for dissemination as established information or for guiding clinical practice.
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Research Article
Shunyu Yao
Institute of Geographic Sciences and Natural Resources Research CAS: Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences
Corresponding Author
ORCiD: https://orcid.org/0000-0003-3399-8033
License:
This work is licensed under a CC BY 4.0 License. Read Full License
A debris flow occurred on July 25, 2020, at Wujia gully, Sichuan Province, China. The previous debris flow in Wujia gully happened 70 years ago. The debris flow had a severe impact downstream. The primary goal of this study is to comprehend the impact of debris flow topography on the movement process. This study compiles field data evidence from locals and conducts field sampling to get specific information using Unmanned Aerial Vehicle (UAV) aerial photography. The rheological properties of debris flow slurry are obtained through soil mechanics and rheological experiments. The movement process of the debris flow was simulated using the depth-integrated continuum approach. Based on numerical simulation analysis, the influence of Wujia gully topography on the debris flow movement process was examined. The analysis reveals that the debris flow in Wujia gully is a typical viscous debris flow, and the debris flow slurry matches the properties of Bingham fluid. Based on slope and elevation, the topography of the Wujia gully debris flow path may be classified into three sections: slope movement area, channel movement area, and deposition area. Furthermore, the topography is the most important element in debris flow movement. The consistent change in the velocity of debris flows on the topographical variation was observed, combined with the viscous debris flow and resistance characteristics. This study may serve as a reference for future debris flow kinematics research and a flow channel for researching typical slope debris flow and its movement process.
Keywords
Wujia gully debris flow, Topography, Shallow water equation, debris flow movement
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CURRENT STATUS: Under Revision
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Posted 27 Oct, 2021
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Editorial decision: Major revisions
On 13 Nov, 2021
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Received 24 Oct, 2021
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This preprint is under consideration at Natural Hazards. A preprint is a preliminary version of a manuscript that has not completed peer review at a journal. Research Square does not conduct peer review prior to posting preprints. The posting of a preprint on this server should not be interpreted as an endorsement of its validity or suitability for dissemination as established information or for guiding clinical practice.
Learn more about In Review
Research Article
Shunyu Yao
Institute of Geographic Sciences and Natural Resources Research CAS: Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences
Corresponding Author
ORCiD: https://orcid.org/0000-0003-3399-8033
Badges
Prescreen
This manuscript passed our Prescreen assessment
Complete author information
Appropriate declaration statements
Potential risks to human health
Prescreen
Peer Review Timeline
CURRENT STATUS: Under Revision
Version 1
Posted 27 Oct, 2021
No community comments so far
Editorial decision: Major revisions
On 13 Nov, 2021
Reviews received
Received 24 Oct, 2021
Reviewers invited
Invitations sent on 24 Oct, 2021
Editor assigned
On 22 Oct, 2021
First submitted
On 20 Oct, 2021
Metrics
Comments: 0
PDF Downloads: ...
HTML Views: ...
License:
This work is licensed under a CC BY 4.0 License. Read Full License
A debris flow occurred on July 25, 2020, at Wujia gully, Sichuan Province, China. The previous debris flow in Wujia gully happened 70 years ago. The debris flow had a severe impact downstream. The primary goal of this study is to comprehend the impact of debris flow topography on the movement process. This study compiles field data evidence from locals and conducts field sampling to get specific information using Unmanned Aerial Vehicle (UAV) aerial photography. The rheological properties of debris flow slurry are obtained through soil mechanics and rheological experiments. The movement process of the debris flow was simulated using the depth-integrated continuum approach. Based on numerical simulation analysis, the influence of Wujia gully topography on the debris flow movement process was examined. The analysis reveals that the debris flow in Wujia gully is a typical viscous debris flow, and the debris flow slurry matches the properties of Bingham fluid. Based on slope and elevation, the topography of the Wujia gully debris flow path may be classified into three sections: slope movement area, channel movement area, and deposition area. Furthermore, the topography is the most important element in debris flow movement. The consistent change in the velocity of debris flows on the topographical variation was observed, combined with the viscous debris flow and resistance characteristics. This study may serve as a reference for future debris flow kinematics research and a flow channel for researching typical slope debris flow and its movement process.
Figure 1
Figure 2
Figure 3
Figure 4
Figure 5
Figure 6
Figure 7
Figure 8
Figure 9
Figure 10
Figure 11
Figure 12
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