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Numerical study of sediment scour at meander flume outlet of boxed culvert diversion work
BACKGROUND: Sediment scour at downstream of hydraulic structures is one of the main reasons threatening its stability. Several soil properties and initial input data have been studied to investigate its influence on scour hole geometry by both physical and numerical models. However, parameters of re...
Autores principales: | , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Public Library of Science
2022
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Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9524646/ https://www.ncbi.nlm.nih.gov/pubmed/36178928 http://dx.doi.org/10.1371/journal.pone.0275347 |
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author | Le, Hien T. T. Nguyen, Chien Van Le, Duc-Hau |
author_facet | Le, Hien T. T. Nguyen, Chien Van Le, Duc-Hau |
author_sort | Le, Hien T. T. |
collection | PubMed |
description | BACKGROUND: Sediment scour at downstream of hydraulic structures is one of the main reasons threatening its stability. Several soil properties and initial input data have been studied to investigate its influence on scour hole geometry by both physical and numerical models. However, parameters of resistance affecting sedimentation and erosion phenomena have not been carried out in the literature. Besides, the auxiliary-like wing walls prevalently used in many real applications have been rarely addressed for their effect on morphological change. RESULTS: In this study, a 3D Computational Fluid Dynamics model is utilized to calibrate the hydraulic characteristics of steady flow going through the culvert by comparison with experimental data, showing good agreement between water depth, velocity, and pressure profiles at the bottom of the boxed culvert. The results show that a grid cell of 0.015 m gave minimum NRMSE and MAE values in test cases. Another approach is numerical testing sediment scour at a meander flume outlet with a variety of roughness/d(50) ratio (c(s)) and diversion wall types. The findings include the following: c(s) = 2.5 indicates the close agreement between the numerical and analytical results of maximum scour depth after the culvert; the influence of four types of wing wall on the geometrical deformation including erosion at the concave bank and deposition at the convex bank of the meander flume outlet; and two short headwalls represent the best solution that accounts for small morphological changes. CONCLUSIONS: The influence of the roughness parameter of soil material and headwall types on sediment scour at the meander exit channel of hydraulic structure can be estimated by the numerical model. |
format | Online Article Text |
id | pubmed-9524646 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2022 |
publisher | Public Library of Science |
record_format | MEDLINE/PubMed |
spelling | pubmed-95246462022-10-01 Numerical study of sediment scour at meander flume outlet of boxed culvert diversion work Le, Hien T. T. Nguyen, Chien Van Le, Duc-Hau PLoS One Research Article BACKGROUND: Sediment scour at downstream of hydraulic structures is one of the main reasons threatening its stability. Several soil properties and initial input data have been studied to investigate its influence on scour hole geometry by both physical and numerical models. However, parameters of resistance affecting sedimentation and erosion phenomena have not been carried out in the literature. Besides, the auxiliary-like wing walls prevalently used in many real applications have been rarely addressed for their effect on morphological change. RESULTS: In this study, a 3D Computational Fluid Dynamics model is utilized to calibrate the hydraulic characteristics of steady flow going through the culvert by comparison with experimental data, showing good agreement between water depth, velocity, and pressure profiles at the bottom of the boxed culvert. The results show that a grid cell of 0.015 m gave minimum NRMSE and MAE values in test cases. Another approach is numerical testing sediment scour at a meander flume outlet with a variety of roughness/d(50) ratio (c(s)) and diversion wall types. The findings include the following: c(s) = 2.5 indicates the close agreement between the numerical and analytical results of maximum scour depth after the culvert; the influence of four types of wing wall on the geometrical deformation including erosion at the concave bank and deposition at the convex bank of the meander flume outlet; and two short headwalls represent the best solution that accounts for small morphological changes. CONCLUSIONS: The influence of the roughness parameter of soil material and headwall types on sediment scour at the meander exit channel of hydraulic structure can be estimated by the numerical model. Public Library of Science 2022-09-30 /pmc/articles/PMC9524646/ /pubmed/36178928 http://dx.doi.org/10.1371/journal.pone.0275347 Text en © 2022 Le et al https://creativecommons.org/licenses/by/4.0/This is an open access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. |
spellingShingle | Research Article Le, Hien T. T. Nguyen, Chien Van Le, Duc-Hau Numerical study of sediment scour at meander flume outlet of boxed culvert diversion work |
title | Numerical study of sediment scour at meander flume outlet of boxed culvert diversion work |
title_full | Numerical study of sediment scour at meander flume outlet of boxed culvert diversion work |
title_fullStr | Numerical study of sediment scour at meander flume outlet of boxed culvert diversion work |
title_full_unstemmed | Numerical study of sediment scour at meander flume outlet of boxed culvert diversion work |
title_short | Numerical study of sediment scour at meander flume outlet of boxed culvert diversion work |
title_sort | numerical study of sediment scour at meander flume outlet of boxed culvert diversion work |
topic | Research Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9524646/ https://www.ncbi.nlm.nih.gov/pubmed/36178928 http://dx.doi.org/10.1371/journal.pone.0275347 |
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