Sensitivity analysis of a built environment exposed to the synthetic monophasic viscous debris flow impacts with 3-D numerical simulations
<p>The characteristics of exposed built environments have a significant effect on debris flow impacts on buildings, but knowledge about their interactions is still limited. This paper presents a sensitivity analysis on the peak impact forces on a whole building resulting from the built environ...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2023-03-01
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| Series: | Natural Hazards and Earth System Sciences |
| Online Access: | https://nhess.copernicus.org/articles/23/871/2023/nhess-23-871-2023.pdf |
| _version_ | 1811162469907824640 |
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| author | X. Huang X. Huang Z. Zhang G. Xiang G. Xiang |
| author_facet | X. Huang X. Huang Z. Zhang G. Xiang G. Xiang |
| author_sort | X. Huang |
| collection | DOAJ |
| description | <p>The characteristics of exposed built environments have a
significant effect on debris flow impacts on buildings, but knowledge about
their interactions is still limited. This paper presents a sensitivity
analysis on the peak impact forces on a whole building resulting from the
built environment parameters, including the orientation, opening scale of
the target building, and azimuthal angle and distance of surrounding
buildings. The impact forces were obtained from the monophasic viscous
debris flow with a synthetic and simplified hydrograph using the FLOW-3D
model, a computational fluid dynamics approach, verified through the
physical modeling results. The results show that the surrounding buildings'
properties have significant roles in determining the peak impact forces. A
shielding effect or canalization effect, which reduces or increases impact
forces, respectively, can be produced by changing the azimuth angle. A
deflection wall for building protection is recommended according to the
shielding effect. A narrowed flow path, determined by both the azimuth angle and distance, has a significant effect on the variation in impact forces. In
addition, it is concluded that a splitting wedge should be designed
following a criterion of avoiding the highest flow depth – the maximum
approaching angle – appearing near the longest wall element. The protruding parts caused by changing the building's orientation contribute to increasing
impact loads within a shielding area. A limited opening scale effect is
observed on the whole building if there is sufficient time for material
intrusion. The insights gained contribute to a better understanding of
building vulnerability indicators and local migration design against debris
flow hazard.</p> |
| first_indexed | 2024-04-10T06:30:13Z |
| format | Article |
| id | doaj.art-048e923c6a9a4e2d8756a8ad4fcf6227 |
| institution | Directory Open Access Journal |
| issn | 1561-8633 1684-9981 |
| language | English |
| last_indexed | 2024-04-10T06:30:13Z |
| publishDate | 2023-03-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Natural Hazards and Earth System Sciences |
| spelling | doaj.art-048e923c6a9a4e2d8756a8ad4fcf62272023-03-01T08:28:21ZengCopernicus PublicationsNatural Hazards and Earth System Sciences1561-86331684-99812023-03-012387188910.5194/nhess-23-871-2023Sensitivity analysis of a built environment exposed to the synthetic monophasic viscous debris flow impacts with 3-D numerical simulationsX. Huang0X. Huang1Z. Zhang2G. Xiang3G. Xiang4Geography and Tourism College, Chongqing Normal University, Chongqing 401331, ChinaChongqing Key Laboratory of Surface Process and Environment Remote Sensing in the Three Gorges Reservoir Area, Chongqing Normal University, Chongqing 401331, ChinaGeography and Tourism College, Chongqing Normal University, Chongqing 401331, China405 Geological Brigade of Sichuan Bureau of Geology & Mineral Resources, Dujiangyan 611830, ChinaState Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu 610059, China<p>The characteristics of exposed built environments have a significant effect on debris flow impacts on buildings, but knowledge about their interactions is still limited. This paper presents a sensitivity analysis on the peak impact forces on a whole building resulting from the built environment parameters, including the orientation, opening scale of the target building, and azimuthal angle and distance of surrounding buildings. The impact forces were obtained from the monophasic viscous debris flow with a synthetic and simplified hydrograph using the FLOW-3D model, a computational fluid dynamics approach, verified through the physical modeling results. The results show that the surrounding buildings' properties have significant roles in determining the peak impact forces. A shielding effect or canalization effect, which reduces or increases impact forces, respectively, can be produced by changing the azimuth angle. A deflection wall for building protection is recommended according to the shielding effect. A narrowed flow path, determined by both the azimuth angle and distance, has a significant effect on the variation in impact forces. In addition, it is concluded that a splitting wedge should be designed following a criterion of avoiding the highest flow depth – the maximum approaching angle – appearing near the longest wall element. The protruding parts caused by changing the building's orientation contribute to increasing impact loads within a shielding area. A limited opening scale effect is observed on the whole building if there is sufficient time for material intrusion. The insights gained contribute to a better understanding of building vulnerability indicators and local migration design against debris flow hazard.</p>https://nhess.copernicus.org/articles/23/871/2023/nhess-23-871-2023.pdf |
| spellingShingle | X. Huang X. Huang Z. Zhang G. Xiang G. Xiang Sensitivity analysis of a built environment exposed to the synthetic monophasic viscous debris flow impacts with 3-D numerical simulations Natural Hazards and Earth System Sciences |
| title | Sensitivity analysis of a built environment exposed to the synthetic monophasic viscous debris flow impacts with 3-D numerical simulations |
| title_full | Sensitivity analysis of a built environment exposed to the synthetic monophasic viscous debris flow impacts with 3-D numerical simulations |
| title_fullStr | Sensitivity analysis of a built environment exposed to the synthetic monophasic viscous debris flow impacts with 3-D numerical simulations |
| title_full_unstemmed | Sensitivity analysis of a built environment exposed to the synthetic monophasic viscous debris flow impacts with 3-D numerical simulations |
| title_short | Sensitivity analysis of a built environment exposed to the synthetic monophasic viscous debris flow impacts with 3-D numerical simulations |
| title_sort | sensitivity analysis of a built environment exposed to the synthetic monophasic viscous debris flow impacts with 3 d numerical simulations |
| url | https://nhess.copernicus.org/articles/23/871/2023/nhess-23-871-2023.pdf |
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