Two-Dimensional Hydrodynamic Modelling of Koshi River and Prediction of Inundation Parameters
Received Date: May 08, 2018 / Accepted Date: May 28, 2018 / Published Date: Jun 05, 2018
This paper presents the results of modelling study of Koshi River. The modelling approach is based on twodimensional hydrodynamic model. The simulation is carried out with model software Nays 2DH. The study analyses the inundation parameters, hazard assessment criteria, flood inundation extent delineation and identification of hazardous areas in different discharge scenarios of 25, 50 and 100 years return periods flow. Based on goodnessof- fit tests and fitting parameters, generalized extreme event (GEV) distribution method is adopted for flood frequency analysis. The model is calibrated with measured water surface elevations and simulation results. The root means square errors (RMSE) and correlation R2 between measured values and simulation results are 0.95 m and 0.98 respectively. The study results conclude that within the stretch of around 50 km from Chatara to Koshi barrage the flood will not overtop embankments and left overbank is under low danger zone. However, islands within the embankments namely Shukrabare, Rajabas, Khairatol, Shivchowk and Galphadiya are vulnerable to inundation. The modelling approach proposed in this study is an attractive option for modelling exceptional flood events when limited data and resources are available.
Keywords: Hydrodynamic model; Return periods; Inundation; Flood prediction; Simulation; Two-dimensional
Citation: Kafle MR, Shakya NM (2018) Two-Dimensional Hydrodynamic Modelling of Koshi River and Prediction of Inundation Parameters. Hydrol Current Res 9:298. Doi: 10.4172/2157-7587.1000298
Copyright: © 2018 Kafle MR, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
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