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Application of a two-dimensional model for flooding and floodplain simulation: Case study in Tra Khuc-Song Ve river in Viet Nam N.T.M. Linh; D.Q. Tri; T.H. Thai; N.Cao Don
Lowland Technology International Vol 20 No 3, Dec (2018)
Publisher : International Association of Lowland Technology

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In this paper, a GIS-integrated two-dimensional (2D) model namely Telemac-2D was used to construct floodplain maps of the study area. Firstly, the NAM model based on characteristics of the watershed, rainfall and evaporation data were used to provide initial boundary conditions for the Telemac-2D model along with other parameters. In turn, this Telemac-2D was integrated with Digital Elevation Map (DEM) in ArcGIS for floodplain mapping. The calibration and validation results for water level showed a high conformity about the phase and water amplitude between calculated and observed data in the years 2007, 2009 and 2013. A comparison between floodplain mapping and information from surveys showed relative consistency in 2009 and 2013 with a low error. The evaluation criteria of NSE, PBIAS, and RSR had a goodness-of-fit between the simulated and the observed values. Finally, this paper has given us an opportunity to understand the application capabilities of the Telemac-2D model and GIS in floodplain and flood inundation mapping and in the study area.
Application of 2D modeling in simulation the erosion of dykes on Thach Han river basin in Vietnam D.Q. Tri; T.H. Thai; N.T.M. Linh
Lowland Technology International Vol 20 No 3, Dec (2018)
Publisher : International Association of Lowland Technology

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Application of 2D modeling to carrying out research on the calculation of water flow rate and the amount of sediments transported has been proved effectively. In this paper, the hydraulic model MIKE 21 was applied to calculate and simulate the data of two big flood events in 1999 and 2005. The calibrated and validated results at Thach Han station and Dong Ha station were relatively similar in terms of phases and amplitude fluctuations of water level with the high value of NashSutcliffe coefficient, and low value of RMSE-observations standard deviation ratio (RSR) and Percent bias (PBIAS). The hydraulic modeling and sediment transport were applied by using MIKE 21 gave an overall assessment on the erosion process on the Thach Han River Basin and river bottom before and after the construction of the dikes and embankments. The construction, accordingly, has proven its significant effects on alleviating the development of increasing erosion on parts of the river flowing through Trieu Do commune, Quang Tri province, Vietnam.
Co-Authors D.Q. Tri N.Cao Don N.T.M. Linh