Improving the 2D Numerical Simulations on Local Scour Hole around Spur Dikes
Local scour is a common threat to structures such as bridge piers, abutments, and dikes that are constructed on natural rivers. To reduce the risk of foundation failure, the understanding of local scour phenomenon around hydraulic structures is important. The well-predicted scour depth can be used a...
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doaj-fe62ef5aa1cb4e96a9bfc0c716342ded2021-06-01T00:52:35ZengMDPI AGWater2073-44412021-05-01131462146210.3390/w13111462Improving the 2D Numerical Simulations on Local Scour Hole around Spur DikesChung-Ta Liao0Keh-Chia Yeh1Yin-Chi Lan2Ren-Kai Jhong3Yafei Jia4Disaster Prevention & Water Environment Research Center, National Yang Ming Chiao Tung University, 1001 University Road, Hsinchu City 30010, TaiwanDisaster Prevention & Water Environment Research Center, National Yang Ming Chiao Tung University, 1001 University Road, Hsinchu City 30010, TaiwanDisaster Prevention & Water Environment Research Center, National Yang Ming Chiao Tung University, 1001 University Road, Hsinchu City 30010, TaiwanDisaster Prevention & Water Environment Research Center, National Yang Ming Chiao Tung University, 1001 University Road, Hsinchu City 30010, TaiwanNational Center for Computational Hydroscience and Engineering, University of Mississippi, 2301 S. Lamar Blvd, Oxford, MS 38655, USALocal scour is a common threat to structures such as bridge piers, abutments, and dikes that are constructed on natural rivers. To reduce the risk of foundation failure, the understanding of local scour phenomenon around hydraulic structures is important. The well-predicted scour depth can be used as a reference for structural foundation design and river management. Numerical simulation is relatively efficient at studying these issues. Currently, two-dimensional (2D) mobile-bed models are widely used for river engineering. However, a common 2D model is inadequate for solving the three-dimensional (3D) flow field and local scour phenomenon because of the depth-averaged hypothesis. This causes the predicted scour depth to often be underestimated. In this study, a repose angle formula and bed geometry adjustment mechanism are integrated into a 2D mobile-bed model to improve the numerical simulation of local scour holes around structures. Comparison of the calculated and measured bed variation data reveals that a numerical model involving the improvement technique can predict the geometry of a local scour hole around spur dikes with reasonable accuracy and reliability.https://www.mdpi.com/2073-4441/13/11/1462numerical simulationlocal scourspur dikeangle of repose |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Chung-Ta Liao Keh-Chia Yeh Yin-Chi Lan Ren-Kai Jhong Yafei Jia |
spellingShingle |
Chung-Ta Liao Keh-Chia Yeh Yin-Chi Lan Ren-Kai Jhong Yafei Jia Improving the 2D Numerical Simulations on Local Scour Hole around Spur Dikes Water numerical simulation local scour spur dike angle of repose |
author_facet |
Chung-Ta Liao Keh-Chia Yeh Yin-Chi Lan Ren-Kai Jhong Yafei Jia |
author_sort |
Chung-Ta Liao |
title |
Improving the 2D Numerical Simulations on Local Scour Hole around Spur Dikes |
title_short |
Improving the 2D Numerical Simulations on Local Scour Hole around Spur Dikes |
title_full |
Improving the 2D Numerical Simulations on Local Scour Hole around Spur Dikes |
title_fullStr |
Improving the 2D Numerical Simulations on Local Scour Hole around Spur Dikes |
title_full_unstemmed |
Improving the 2D Numerical Simulations on Local Scour Hole around Spur Dikes |
title_sort |
improving the 2d numerical simulations on local scour hole around spur dikes |
publisher |
MDPI AG |
series |
Water |
issn |
2073-4441 |
publishDate |
2021-05-01 |
description |
Local scour is a common threat to structures such as bridge piers, abutments, and dikes that are constructed on natural rivers. To reduce the risk of foundation failure, the understanding of local scour phenomenon around hydraulic structures is important. The well-predicted scour depth can be used as a reference for structural foundation design and river management. Numerical simulation is relatively efficient at studying these issues. Currently, two-dimensional (2D) mobile-bed models are widely used for river engineering. However, a common 2D model is inadequate for solving the three-dimensional (3D) flow field and local scour phenomenon because of the depth-averaged hypothesis. This causes the predicted scour depth to often be underestimated. In this study, a repose angle formula and bed geometry adjustment mechanism are integrated into a 2D mobile-bed model to improve the numerical simulation of local scour holes around structures. Comparison of the calculated and measured bed variation data reveals that a numerical model involving the improvement technique can predict the geometry of a local scour hole around spur dikes with reasonable accuracy and reliability. |
topic |
numerical simulation local scour spur dike angle of repose |
url |
https://www.mdpi.com/2073-4441/13/11/1462 |
work_keys_str_mv |
AT chungtaliao improvingthe2dnumericalsimulationsonlocalscourholearoundspurdikes AT kehchiayeh improvingthe2dnumericalsimulationsonlocalscourholearoundspurdikes AT yinchilan improvingthe2dnumericalsimulationsonlocalscourholearoundspurdikes AT renkaijhong improvingthe2dnumericalsimulationsonlocalscourholearoundspurdikes AT yafeijia improvingthe2dnumericalsimulationsonlocalscourholearoundspurdikes |
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