A two-dimensional hydrodynamic model for flood inundation simulation: a case study in the lower Mekong river basin

Article

Dutta, Dushmanta, Alam, Jahangir, Umeda, Kazuo, Hayashi, Masayoshi and Hironaka, Sadayuki. 2007. "A two-dimensional hydrodynamic model for flood inundation simulation: a case study in the lower Mekong river basin." Hydrological Processes. 21 (9), pp. 1223-1237. https://doi.org/10.1002/hyp.6682
Article Title

A two-dimensional hydrodynamic model for flood inundation
simulation: a case study in the lower Mekong river basin

ERA Journal ID1948
Article CategoryArticle
AuthorsDutta, Dushmanta (Author), Alam, Jahangir (Author), Umeda, Kazuo (Author), Hayashi, Masayoshi (Author) and Hironaka, Sadayuki (Author)
Journal TitleHydrological Processes
Journal Citation21 (9), pp. 1223-1237
Number of Pages15
Year2007
Place of PublicationUnited Kingdom
ISSN0885-6087
1099-1085
Digital Object Identifier (DOI)https://doi.org/10.1002/hyp.6682
Web Address (URL)http://onlinelibrary.wiley.com/doi/10.1002/hyp.6682/full
Abstract

The lower Mekong basin is frequently affected by floods. Prolonged floods disrupt daily activities and cause huge socio-economic damage almost every year. An advanced flood warning system could provide achievable non-structural measures for reducing such damages. With a view to developing an advanced flood warning system, a distributed hydrodynamic modelling approach has been adopted for simulating a flood inundation phenomenon in the lower Mekong basin. A modelling system with a one-dimensional (1-D) river flow model and a two-dimensional (2-D) surface flow model has been used for simulating flood inundation. In the model, exchange of flows between the river and surface floodplain is calculated through established links, which determine the overflow from river nodes to surface grids or vice versa. These occur due to overtopping or failure of the levee when water height surpasses levee height. The model has incorporated detailed information about urban terrain features like embankments, roads, bridges, culverts, etc. in the simulation. A geographical information system (GIS)-based comprehensive raster database of different spatial data layers is prepared and used in the model development. An explicit solution scheme is used for numerical computation, which considerably reduces the run time and makes the model suitable for use as a flood warning system in a large river basin. The model simulated results in the lower Mekong basin have shown close alignment with the observed data in terms of water level and discharge in various river gauging stations and flood extents in the floodplain and from the results it can be inferred that the model can predict the magnitude and duration of flood inundation to a reasonable level of accuracy. Copyright © 2007 John Wiley & Sons, Ltd.

Keywordsdistributed hydrodynamic modelling; combined 1-D river and 2-D surface flow model; flood warning system; Mekong basin
ANZSRC Field of Research 2020370901. Geomorphology and earth surface processes
400513. Water resources engineering
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Byline AffiliationsMonash University
Asian Institute of Technology, Thailand
Infrastructure Development Institute, Japan
NEWJEC Consultants, Japan
Institution of OriginUniversity of Southern Queensland
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