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Title: A dual finite volume method scheme for catastrophic flash floods in channel networks
Authors: Yoshioka, Hidekazu
Unami, Koichi  kyouindb  KAKEN_id  orcid https://orcid.org/0000-0001-6910-1094 (unconfirmed)
Fujihara, Masayuki  kyouindb  KAKEN_id  orcid https://orcid.org/0000-0001-6868-0143 (unconfirmed)
Author's alias: 吉岡, 秀和
Keywords: Channel network
Dam failure
Finite volume method
Flash floods
Shallow water equations
Issue Date: Jan-2015
Publisher: Elsevier Inc.
Journal title: Applied Mathematical Modelling
Volume: 39
Issue: 1
Start page: 205
End page: 229
Abstract: This paper develops a new numerical scheme for flash floods based on the one-dimensional shallow water equations in channel networks, referred to as the dual finite volume method (DFVM) scheme. The scheme uses an upwind spatial discretization based on staggered meshes so that the flows in multiply connected channel networks are consistently handled without complicated treatment at junctions. The scheme is firstly examined with a series of test cases including idealized and experimental dam break problems to demonstrate its accuracy and versatility. The scheme is then applied to numerical simulation of a flash flood resulting from an earthquake-induced complete dam failure in Japan. Channels from a reservoir to the downstream rivers are modelled as a multiply connected channel network with non-prismatic cross-sections, steep slopes, and bends. The computational results agree well with the field observations and eyewitness reports. Numerical simulation of alternative scenarios as possible cases is also performed to analyze potential risks of the downstream area.
Rights: © 2014 Elsevier Inc.
This is not the published version. Please cite only the published version. この論文は出版社版でありません。引用の際には出版社版をご確認ご利用ください。
URI: http://hdl.handle.net/2433/193279
DOI(Published Version): 10.1016/j.apm.2014.05.021
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