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ORIGINAL RESEARCH article
Front. Mar. Sci.
Sec. Marine Ecosystem Ecology
Volume 11 - 2024 |
doi: 10.3389/fmars.2024.1462760
This article is part of the Research Topic Aquatic Environment Changes of Vegetated Regions in Rivers, Marshes, and Coastal Regions View all articles
Numerical investigation on the evolutionary characteristics of landslide dam-break flow in a wet-bed channel with riparian vegetation
Provisionally accepted- 1 Nanchang University, Nanchang, China
- 2 Chongqing Flood and Drought Disaster Prevention Center, Chongqing, China
- 3 Chongqing Water Resources Bureau, Chongqing, China
- 4 Chongqing Jiaotong University, Nan'an District, Chongqing Municipality, China
Riparian vegetation always grows on both sides of a natural river during a dam-break event, while the river typically retains some water instead of completely drying out. the RNG k-ε turbulence model is employed to examine the evolutionary characteristics of the dam-break flow in the downstream vegetated channel. This model facilitates the analysis of water-level fluctuations, velocity distributions, and the retardation effects of vegetation on the dam-break flow by varying the initial water depth (IWD) in the downstream channel. Results indicates that as the water depth in the downstream channel increases, the dam-break wave tends to form more readily, possesses a larger amplitude, and the duration of rapid congestion in the dam-break current decreases. Hence, the surface velocity gradually declines and shows an intermittent distribution. Vegetation impedes the flow evolution in the vegetated area, an effect that diminishes progressively with increasing IWD. In contrast, vegetation hastens the evolution of water flow in the main channel, which remains minimally affected by the IWD.
Keywords: riparian vegetation, Dam-break wave, velocity, initial water depth, Water-level
Received: 10 Jul 2024; Accepted: 06 Aug 2024.
Copyright: © 2024 Song, Chen, Zhao and Yuan. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
* Correspondence:
Gangyong Song, Nanchang University, Nanchang, China
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