Three-Dimensional Levee and Floodwall Underseepage
Levee and floodwall seepage models based on two-dimensional (2D) conditions can underpredict landside vertical hydraulic gradients and uplift pressures due to excavations and convex bends. The Sherman Island levee system is used to calibrate a three-dimensional (3D) seepage model to evaluate the eff...
Published in: | Canadian Geotechnical Journal |
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ftunivpacificdc:oai:scholarlycommons.pacific.edu:soecs-facarticles-1210 2023-08-27T04:11:58+02:00 Three-Dimensional Levee and Floodwall Underseepage Merry, Scott Leopold, Aaron Stark, Timothy Jafari, Navid 2016-01-01T08:00:00Z https://scholarlycommons.pacific.edu/soecs-facarticles/210 https://doi.org/10.1139/cgj-2014-0343 unknown Scholarly Commons https://scholarlycommons.pacific.edu/soecs-facarticles/210 doi:10.1139/cgj-2014-0343 https://doi.org/10.1139/cgj-2014-0343 All Faculty Articles - School of Engineering and Computer Science Engineering text 2016 ftunivpacificdc https://doi.org/10.1139/cgj-2014-0343 2023-08-07T21:58:56Z Levee and floodwall seepage models based on two-dimensional (2D) conditions can underpredict landside vertical hydraulic gradients and uplift pressures due to excavations and convex bends. The Sherman Island levee system is used to calibrate a three-dimensional (3D) seepage model to evaluate the effect of finite landside excavations and convex levee bends on landside seepage. The model shows that a 3D analysis is required for a landside excavation with an aspect ratio (length to width) less than 1L:1.5W. For drainage canals and ditches that parallel a levee or floodwall and are wider than 15 m, gradients at the excavation center are essentially equal to 2D vertical gradients but greater than 2D gradients near the excavation sidewalls. The Sherman Island calibrated seepage model also confirms concave bends diverge seepage and yield lower vertical gradients than 2D models. Varying the degree of levee curvature (ω = 45°–100°) indicates that sharper convex bends (ω = 100°; axisymmetric radius, 150 m) cause vertical gradients that can be about 150% greater than 2D analyses. Text Sherman Island University of the Pacific: Scholarly Commons Sherman Island ENVELOPE(-100.000,-100.000,-73.050,-73.050) Canadian Geotechnical Journal 53 1 72 84 |
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Open Polar |
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University of the Pacific: Scholarly Commons |
op_collection_id |
ftunivpacificdc |
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unknown |
topic |
Engineering |
spellingShingle |
Engineering Merry, Scott Leopold, Aaron Stark, Timothy Jafari, Navid Three-Dimensional Levee and Floodwall Underseepage |
topic_facet |
Engineering |
description |
Levee and floodwall seepage models based on two-dimensional (2D) conditions can underpredict landside vertical hydraulic gradients and uplift pressures due to excavations and convex bends. The Sherman Island levee system is used to calibrate a three-dimensional (3D) seepage model to evaluate the effect of finite landside excavations and convex levee bends on landside seepage. The model shows that a 3D analysis is required for a landside excavation with an aspect ratio (length to width) less than 1L:1.5W. For drainage canals and ditches that parallel a levee or floodwall and are wider than 15 m, gradients at the excavation center are essentially equal to 2D vertical gradients but greater than 2D gradients near the excavation sidewalls. The Sherman Island calibrated seepage model also confirms concave bends diverge seepage and yield lower vertical gradients than 2D models. Varying the degree of levee curvature (ω = 45°–100°) indicates that sharper convex bends (ω = 100°; axisymmetric radius, 150 m) cause vertical gradients that can be about 150% greater than 2D analyses. |
format |
Text |
author |
Merry, Scott Leopold, Aaron Stark, Timothy Jafari, Navid |
author_facet |
Merry, Scott Leopold, Aaron Stark, Timothy Jafari, Navid |
author_sort |
Merry, Scott |
title |
Three-Dimensional Levee and Floodwall Underseepage |
title_short |
Three-Dimensional Levee and Floodwall Underseepage |
title_full |
Three-Dimensional Levee and Floodwall Underseepage |
title_fullStr |
Three-Dimensional Levee and Floodwall Underseepage |
title_full_unstemmed |
Three-Dimensional Levee and Floodwall Underseepage |
title_sort |
three-dimensional levee and floodwall underseepage |
publisher |
Scholarly Commons |
publishDate |
2016 |
url |
https://scholarlycommons.pacific.edu/soecs-facarticles/210 https://doi.org/10.1139/cgj-2014-0343 |
long_lat |
ENVELOPE(-100.000,-100.000,-73.050,-73.050) |
geographic |
Sherman Island |
geographic_facet |
Sherman Island |
genre |
Sherman Island |
genre_facet |
Sherman Island |
op_source |
All Faculty Articles - School of Engineering and Computer Science |
op_relation |
https://scholarlycommons.pacific.edu/soecs-facarticles/210 doi:10.1139/cgj-2014-0343 https://doi.org/10.1139/cgj-2014-0343 |
op_doi |
https://doi.org/10.1139/cgj-2014-0343 |
container_title |
Canadian Geotechnical Journal |
container_volume |
53 |
container_issue |
1 |
container_start_page |
72 |
op_container_end_page |
84 |
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1775355674734100480 |