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N.Cao Don
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Civil Engineering, Building, Construction & Architecture Engineering Transportation

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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.
Integrated impacts of climate change and land use change on surface hydrology in the future in Nakdong river basin in Korea N.V. Quan; N.Cao Don; G.S. Kim
Lowland Technology International Vol 20 No 3, Dec (2018)
Publisher : International Association of Lowland Technology

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The main objective of this paper is to forecast the integrated impacts of both climate change and land use changes on surface hydrology which is focused particularly on streamflow assessment under scenarios (A2, B1, and A1B) of climate change and land use change (2030, 2050, and 2080) in Nakdong basin by combination of both models as hydrology model (ArcSWAT) and land use change model (CA_Markov). The results indicated that the mean annual integrated impacts of climate change and land use change on streamflow in the future showed an increase tendency for all periods under scenarios A2, B1, and A1B. However, B1 scenario showed the highest of +3.97%, while A2 showed the lowest increase of +1.1%. However, the mean months of streamflow showed different changes that were forecasted large changes as an increase from +12 to +18% in months of Jan, Feb, Jul and Aug, while it showed a significant reduction from -9.0% to -19% in May and Oct for all periods under A2, B1, and A1B scenarios. Moreover, results were also to reveal that land use change and climate change both increased on the mean annual streamflow, but the impact of climate change was higher than that of land use change.
Co-Authors D.Q. Tri G.S. Kim N.T.M. Linh N.V. Quan T.H. Thai