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首页> 外文期刊>British Journal of Environment and Climate Change >Two-Dimensional Hydrodynamic Modelling of FloodInundation for a Part of the Mekong River withTELEMAC-2D
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Two-Dimensional Hydrodynamic Modelling of FloodInundation for a Part of the Mekong River withTELEMAC-2D

机译：TELEMAC-2D在湄公河部分地区洪水泛滥的二维水动力模型

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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 pre- and 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.
机译：目的：本文研究了基于TELEMAC-2D的二维（2D）水动力模型的开发，该模型用于模拟湄公河一部分的柬埔寨（Kratie）到磅湛（Kampong Cham）河的洪水。研究的动机是研究TELEMAC-2D在洪水预报中的可行性，特别是确定其在洪水模拟中的适用性，重点是通过并行化来减少模型运行时间.DHI-NTU南洋理工大学南洋环境与水研究所（NEWRI）中心，时间为2013年11月至2014年3月。 Cham并在洪灾前，洪灾和洪灾后的特定日期将模型仿真与MODIS卫星图像进行了比较。结果：发现在洪灾洪灾期间，两者之间的匹配率很高（> 90％）洪水前后的匹配度低于50％时从卫星图像获得的仿真结果和观测结果。结论：二维仿真结果与观测值一致来自卫星成像的问题。洪水前和洪水后的差异可能是由于以下事实：（i）模型仅考虑了河流和洪泛区中水流的水动力过程，并未考虑其他可能渗透或蒸发的水文过程。 （ii）500 m x 500 m的MODIS卫星图像的分辨率可能太粗糙，因此当面积较小或水深较低时，不足以识别淹没区域。最后，发现使用多核处理器进行并行化可以显着减少计算时间，尽管当内核数增加到4个以上时，在加速方面的优势较小。

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