Two-Dimensional Hydrodynamic Modelling of Flood Inundation for a Part of the Mekong River with TELEMAC-2D.
Loading...
Date
2015-04
Journal Title
Journal ISSN
Volume Title
Publisher
Abstract
Aims: This paper presents a study on the development of a 2-dimensional (2D) hydrodynamic
model based on TELEMAC-2D for the flood simulation of the river from Kratie to Kampong Cham in
Cambodia, a part of the Mekong River. The motivation behind the research was to study the
feasibility of TELEMAC-2D in flood forecasting, and specifically to determine its adequacy in flood
simulations with a focus on the reduction in model run-time through parallelization.
Place and Duration of Study: DHI-NTU Centre, Nanyang Environment and Water Research
Institute (NEWRI), Nanyang Technological University, between November 2013 and March 2014.
Methodology: We simulated an actual flood event which occurred between June to November in
2001 for the stretch of the Mekong River from Kratie to Kampong Cham and compared the model
simulations with MODIS satellite Images for specific days in the pre-, peak- and post-flood period.
Results: It was found that during the peak-flood period, there was high percentage (> 90%) match
between the simulation results and observation obtained from satellite images while the match was
below 50% for the pre- and post- flood periods.
Conclusion: The 2D simulation results were consistent with observations from satellite imaging. The discrepancy at pre- and post-flood may be due to the fact that (i) the model takes into account
only hydrodynamic processes of flows in the river and flood plain, it does not consider other
hydrological processes such as infiltration or evaporation which may be important during the preand
post- flood periods, and (ii) the resolution of MODIS satellite image at 500m x 500m may be too
coarse and therefore not sufficient to identify flooded areas when the area is small or water depth
low. Finally, it was found that the computing time can be reduced significantly with parallelization
using multi-core processors, albeit with lesser advantage in speedup when the number of cores
increased beyond 4.
Description
Keywords
Flood inundation modeling, Mekong River, parallel processing
Citation
Vu Tung T, Nguyen Phuoc K T, Chua Lloyd H C, Law Adrian W K. Two-Dimensional Hydrodynamic Modelling of Flood Inundation for a Part of the Mekong River with TELEMAC-2D. British Journal of Environment and Climate Change. 2015 Apr-Jun; 5(2): 162-175.