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http://hdl.handle.net/10397/96576
Title: | Numerical analysis of hydrodynamics influenced by a deformed bed due to a near-bank vegetation patch | Authors: | Yi, Z Sun, Y Wang, X Liu, D Yan, X |
Issue Date: | 1-Feb-2022 | Source: | Water supply, 1 Feb. 2022, v. 22, no. 2, p. 1546-1556 | Abstract: | This study uses a 2D hydro-morphological model to analyze hydrodynamics over flat and deformed beds with a near-bank vegetation patch. By varying the patch density, the generalized results show that the hydrodynamics over deformed beds differs a lot from those over flat beds. It is found that the deformed bed topography leads to an apparent decrease in longitudinal velocity and bed shear stress in the open region and longitudinal surface gradient for the entire vegetated reach. However, the transverse flow motion and transverse surface gradient in the region of the leading edge and trailing edge is enhanced or maintained, suggesting the strengthening of secondary flow motion. Interestingly, the deformed bed topography tends to alleviate the horizontal shear caused by the junction-interface horizontal coherent vortices, indicating that the turbulence-induced flow mixing is highly inhibited as the bed is deformed. The interior flow adjustment through the patch for the deformed bed requires a shorter distance, La, which is related to the vegetative drag length, (Cda) 1, with a logarithmic formula (La 0.4ln [(Cda) 1] b, with b 3.83 and 4.03 for the deformed and flat beds). The sloping bed topographic effect in the open region accelerating the flow may account for the quick flow adjustment. | Keywords: | Deformed bed topography Flow adjustment Inhibited shear layer development Near-bank patch |
Publisher: | IWA Publishing | Journal: | Water supply | ISSN: | 1606-9749 | DOI: | 10.2166/ws.2021.334 | Rights: | © 2022 The Authors This is an Open Access article distributed under the terms of the Creative Commons Attribution Licence (CC BY 4.0), which permits copying, adaptation and redistribution, provided the original work is properly cited (http://creativecommons.org/licenses/by/4.0/). The following publication Yi, Z., Sun, Y., Wang, X., Liu, D., & Yan, X. (2022). Numerical analysis of hydrodynamics influenced by a deformed bed due to a near-bank vegetation patch. Water Supply, 22(2), 1546-1556 is available at https://doi.org/10.2166/ws.2021.334. |
Appears in Collections: | Journal/Magazine Article |
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