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Numerical investigation on the role of check dams with bottom outlets in debris flow mobility by 2D SPH

Check dams with bottom outlets are widely used in debris flow gullies to minimize the damage caused by debris flows. However, the bottom size is often based on empirical criteria due to the lack of knowledge of the interaction between the debris flow and the check dam with the bottom outlet. In this...

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Autores principales: Shi, Hao, Huang, Yu, Feng, Dianlei
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9705551/
https://www.ncbi.nlm.nih.gov/pubmed/36443425
http://dx.doi.org/10.1038/s41598-022-24962-4
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author Shi, Hao
Huang, Yu
Feng, Dianlei
author_facet Shi, Hao
Huang, Yu
Feng, Dianlei
author_sort Shi, Hao
collection PubMed
description Check dams with bottom outlets are widely used in debris flow gullies to minimize the damage caused by debris flows. However, the bottom size is often based on empirical criteria due to the lack of knowledge of the interaction between the debris flow and the check dam with the bottom outlet. In this study, the interaction between a viscous debris flow and check dams with bottom outlets is investigated via flume tests using 2D smoothed particle hydrodynamics. The normalized height of the bottom outlet is varied from 0 to 1, and slope angles from 15 to 35° are considered. Based on the numerical results, the jump height decays with the increasing normalized height of the bottom outlet and this trend can be approximated by a power law function. When the normalized height of the bottom outlet is less than 0.15, the performance is similar to that of a closed check dam. The flow regulation and sediment trapping functions of the check dam may fail when the normalized height of the bottom outlet is greater than 0.6. These results show that the energy breaking, flow regulation, and sediment trapping functions of check dams with bottom outlets operate well when the normalized height of the bottom outlet is in the range 0.15–0.6. Even if model limitations require further efforts to validate the findings of this study, they provide a basis for the rational design of check dams with bottom outlets.
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spelling pubmed-97055512022-11-30 Numerical investigation on the role of check dams with bottom outlets in debris flow mobility by 2D SPH Shi, Hao Huang, Yu Feng, Dianlei Sci Rep Article Check dams with bottom outlets are widely used in debris flow gullies to minimize the damage caused by debris flows. However, the bottom size is often based on empirical criteria due to the lack of knowledge of the interaction between the debris flow and the check dam with the bottom outlet. In this study, the interaction between a viscous debris flow and check dams with bottom outlets is investigated via flume tests using 2D smoothed particle hydrodynamics. The normalized height of the bottom outlet is varied from 0 to 1, and slope angles from 15 to 35° are considered. Based on the numerical results, the jump height decays with the increasing normalized height of the bottom outlet and this trend can be approximated by a power law function. When the normalized height of the bottom outlet is less than 0.15, the performance is similar to that of a closed check dam. The flow regulation and sediment trapping functions of the check dam may fail when the normalized height of the bottom outlet is greater than 0.6. These results show that the energy breaking, flow regulation, and sediment trapping functions of check dams with bottom outlets operate well when the normalized height of the bottom outlet is in the range 0.15–0.6. Even if model limitations require further efforts to validate the findings of this study, they provide a basis for the rational design of check dams with bottom outlets. Nature Publishing Group UK 2022-11-28 /pmc/articles/PMC9705551/ /pubmed/36443425 http://dx.doi.org/10.1038/s41598-022-24962-4 Text en © The Author(s) 2022 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) .
spellingShingle Article
Shi, Hao
Huang, Yu
Feng, Dianlei
Numerical investigation on the role of check dams with bottom outlets in debris flow mobility by 2D SPH
title Numerical investigation on the role of check dams with bottom outlets in debris flow mobility by 2D SPH
title_full Numerical investigation on the role of check dams with bottom outlets in debris flow mobility by 2D SPH
title_fullStr Numerical investigation on the role of check dams with bottom outlets in debris flow mobility by 2D SPH
title_full_unstemmed Numerical investigation on the role of check dams with bottom outlets in debris flow mobility by 2D SPH
title_short Numerical investigation on the role of check dams with bottom outlets in debris flow mobility by 2D SPH
title_sort numerical investigation on the role of check dams with bottom outlets in debris flow mobility by 2d sph
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9705551/
https://www.ncbi.nlm.nih.gov/pubmed/36443425
http://dx.doi.org/10.1038/s41598-022-24962-4
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