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Open AccessArticle

A New Method for Wet-Dry Front Treatment in Outburst Flood Simulation

1
Key Laboratory of Mountain Hazards and Earth Surface Process, Chinese Academy of Sciences, Chengdu 610041, China
2
Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China
3
University of Chinese Academy of Sciences, Beijing 100049, China
4
Key Laboratory of Land Surface Pattern and Simulation, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China
5
The Engineering & Technical College of Chengdu University of Technology, Leshan 614000, China
6
Sichuan Highway Planning, Survey, Design and Research Institute Ltd., Chengdu 610041, China
*
Author to whom correspondence should be addressed.
Water 2021, 13(2), 221; https://doi.org/10.3390/w13020221
Received: 9 November 2020 / Revised: 12 January 2021 / Accepted: 14 January 2021 / Published: 18 January 2021
(This article belongs to the Special Issue Soil–Water Conservation, Erosion, and Landslide)
When utilizing a finite volume method to predict outburst flood evolution in real geometry, the processing of wet-dry front and dry cells is an important step. In this paper, we propose a new approach to process wet-dry front and dry cells, including four steps: (1) estimating intercell properties; (2) modifying interface elevation; (3) calculating dry cell elevations by averaging intercell elevations; and (4) changing the value of the first term of slope limiter based on geometry in dry cells. The Harten, Lax, and van Leer with the contact wave restored (HLLC) scheme was implemented to calculate the flux. By combining the MUSCL (Monotone Upstream–centred Scheme for Conservation Laws)-Hancock method with the minmod slope limiter, we achieved second-order accuracy in space and time. This approach is able to keep the conservation property (C-property) and the mass conservation of complex bed geometry. The results of numerical tests in this study are consistent with experimental data, which verifies the effectiveness of the new approach. This method could be applied to acquire wetting and drying processes during flood evolution on structured meshes. Furthermore, a new settlement introduces few modification steps, so it could be easily applied to matrix calculations. The new method proposed in this study can facilitate the simulation of flood routing in real terrain. View Full-Text
Keywords: shallow water equations; wet-dry front; outburst flood; TVD-scheme; MUSCL-Hancock method shallow water equations; wet-dry front; outburst flood; TVD-scheme; MUSCL-Hancock method
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MDPI and ACS Style

Liu, D.; Tang, J.; Wang, H.; Cao, Y.; Bazai, N.A.; Chen, H.; Liu, D. A New Method for Wet-Dry Front Treatment in Outburst Flood Simulation. Water 2021, 13, 221. https://doi.org/10.3390/w13020221

AMA Style

Liu D, Tang J, Wang H, Cao Y, Bazai NA, Chen H, Liu D. A New Method for Wet-Dry Front Treatment in Outburst Flood Simulation. Water. 2021; 13(2):221. https://doi.org/10.3390/w13020221

Chicago/Turabian Style

Liu, Dingzhu; Tang, Jinbo; Wang, Hao; Cao, Yang; Bazai, Nazir A.; Chen, Huayong; Liu, Daochuan. 2021. "A New Method for Wet-Dry Front Treatment in Outburst Flood Simulation" Water 13, no. 2: 221. https://doi.org/10.3390/w13020221

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