Two-Dimensional Hydrodynamic Modelling of Flood Inundation for a Part of the Mekong River with TELEMAC-2D

Vu, Tung T.; Nguyen, Phuoc Khac-Tien; Chua, Leok Poh; Law, Adrian Wing‐Keung

doi:10.9734/bjecc/2015/12885

Cited by 17 publications

(8 citation statements)

References 8 publications

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“…The results show that the recession part is better simulated by HR2D than T2D in both the events, but both the models are struggled to capture the initial rising part of the flood hydrograph in event A. Similar results were observed in a study by Vu et al (2015) for T2D flood inundation modeling, where the highest agreement between the modeled results and observations is for the peak flow conditions, not for pre-and post-flood conditions even for the flood extent. Reason behind a higher and therefore a better recession limb in HR2D can be the finer mesh in HR2D, which influence the overall volume under the curve of a hydrograph and a higher roughness, delaying and distributing the flow and keeping the volume higher until the end of simulations.…”

Section: Calibration and Single-storm Flood Eventssupporting

confidence: 81%

Comparison of two hydrodynamic models for their rain-on-grid technique to simulate flash floods in steep catchment

Godara,

Bruland,

Alfredsen

2024

Front. Water

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In this study, two hydrodynamic models, TELEMAC-2D and HEC-RAS 2D, were compared for their Rain-on-Grid (RoG) technique with a particular focus on runoff generation processes in a small and steep catchment. Curve number (CN) method was applied in both the models to simulate two single storm events up to 20 h of duration, whereas the Green-Ampt Redistribution (GAR) method was additionally applied in HEC-RAS 2D for a multi-peak flood event with sustained flow between the peaks. CN and GAR methods were compared for this flood event, and a sensitivity analysis of the GAR parameters was also done. Moreover, the two models were compared for their calibration process, computational time, mesh size and shape, and model availability, in general, as well as the results including inundated areas, water depth, and velocity. The results indicate that both the models are capable of reproducing short duration single storm floods. NSE and R2 for both models ranged from 0.70 to 0.90 and from 0.93 to 0.95. However, the models struggled to reproduce the long- duration multi-peak flood event. The sensitivity analysis showed that the results are not very sensitive to the two GAR parameters which are responsible to influence the flow of the second peak in the flood event. Neither the CN nor the GAR infiltration method successfully replicated such events because the hydraulic models permanently lose infiltrated water from the domain. The returned sub-surface flow significantly contributes to river flow during these flood events; however, none of the model incorporates a return flow algorithm.

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Section: Calibration and Single-storm Flood Eventssupporting

confidence: 81%

Comparison of two hydrodynamic models for their rain-on-grid technique to simulate flash floods in steep catchment

Godara,

Bruland,

Alfredsen

2024

Front. Water

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“…In the Amazon region, this model was successfully applied to simulate estuarine regions hydrodynamics (Oliveros et al, 2008), the evolution of anabranching structures (Frias et al, 2015;Mendoza et al, 2016). It has also already been applied to model FP (Hostache et al, 2014;Smolders et al, 2015) and other large rivers (Vu et al, 2015).…”

Section: Hydrodynamics Modelmentioning

confidence: 99%

Flooding Dynamics Within an Amazonian Floodplain: Water Circulation Patterns and Inundation Duration

Pinel

Bonnet

Silva

et al. 2020

Water Resources Research

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Flooding dynamics across a medium-size (Janauaca Lake, 786 km 2 ) floodplain system along the Amazon/Solimoes River over a 9-year period (2006-2015) is studied through integration of remote sensing and limited in situ data in hydrologic-hydrodynamic modelling based on Telemac-2D model. Model accuracy varies through the hydrological year. We focus on seasonal and interannual spatial variability of water circulation and inundation duration. We highlight strong heterogeneities in water velocity magnitude between the different morphological domains of the floodplain, the highest velocities being encountered in the river-floodplain channel. In addition to topography, we emphasize the importance of the main channel and the local runoff in controlling the water circulation, at least during part of the hydrological year. From low water to early rising period, local runoff constrains the river incursion across the floodplain, while the rates of main channel rising/receding controls the flood duration. The comparison of several hydrological years highlights the interannual changes of these hydraulic controls and also the influence exerted by prior inundation conditions. While we observed few changes in water velocity distribution among hydrological years, the inundation duration is highly variable. Usually defined by maximum water level, extreme flood events may paradoxically induce positive (up to 40 days) but also negative (up to −20 days) anomalies of inundation duration.

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“…The TELEMAC-MASCARET system (http://www.telemacsystem.com), which was introduced by the National Hydraulics and Environmental Laboratory, a part of the R&D group of Electricité de France (EDF), is a numerical modelling system focusing on environmental processes in free surface transient flows. The primary purpose of TELEMAC is to simulate the flow dynamics in a waterbody via the solution of the shallow water equations (Vu et al, 2015). Using a finite-element method, TELEMAC-2D solves the continuity and momentum equations on an unstructured mesh made up of triangles.…”

Section: Telemac 2dmentioning

confidence: 99%

The multi-channel system of the Vietnamese Mekong Delta: impacts on the flow dynamics under relative sea level rise scenarios

Nguyen

Gratiot

et al. 2022

Preprint

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The Mekong Delta has the world's third largest surface area. It plays an indisputable role in the economy and livelihoods of Vietnam, Cambodia, with repercussions at regional and global scales. During recent decades, the Vietnamese part of the Mekong Delta underwent profound human interventions (construction of dykes and multi-channel networks), which modified the hydrodynamic regime, especially cycles of field submersion. In this study, we first applied a full 2D numerical hydraulic model, TELEMAC-2D, to examine the effects of the complex channel and river networks on the spatial and temporal distribution of the flow in the 40,000 km2 of the Vietnamese Mekong Delta. Then, two scenarios of relative sea level rise in 2050 and 2100 are implemented to simulate the future patterns of water fluxes in the delta. The results show that the dykes and multi-channel networks would reduce by 36% the inundation area and lessen by 15% the peak water level and 24% discharge over the floodplains. Despite this protection, under relative sea level rise of 30 cm and 100 cm, the maximum flooded area could occupy about 69% and 85% of the whole delta in 2050 and 2100, respectively.

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Two-Dimensional Hydrodynamic Modelling of Flood Inundation for a Part of the Mekong River with TELEMAC-2D

Cited by 17 publications

References 8 publications

Comparison of two hydrodynamic models for their rain-on-grid technique to simulate flash floods in steep catchment

Comparison of two hydrodynamic models for their rain-on-grid technique to simulate flash floods in steep catchment

Flooding Dynamics Within an Amazonian Floodplain: Water Circulation Patterns and Inundation Duration

The multi-channel system of the Vietnamese Mekong Delta: impacts on the flow dynamics under relative sea level rise scenarios

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