Title: Flood stages assessment using open source 1D hydrodynamic modelling in data scarce region

Authors: Ujas D. Pandya; Dhruvesh P. Patel

Addresses: Civil Engineering Department, Government Engineering College, Gandhinagar, Gujarat Technological University (GTU), Gandhinagar-382028, Gujarat, India ' Civil Engineering Department, School of Technology, Pandit Deendayal Energy University (PDEU) – formerly (PDPU), Raisan, Gandhinagar-382007, Gujarat, India

Abstract: Flood is disastrous for developing countries, its assessment is important for flood risk management. The present case describes the formation of a hydrodynamic model for flood mitigation studies. The 1D hydrodynamic model is generated for Sabarmati River from Chiloda Bridge to Vasana barrage. The 1D river geometry has been generated using Cartoset-1 DEM of 10 m resolution. The boundary condition for upstream and downstream has been fixed and the model is simulated under the unsteady flow conditions. As an outcome, the discharge, water surface elevation, velocity and flow area have been derived. Afterwards, the simulated flow and stages at the known section are compared with the observed data and show a significant correlation. The present case shows the application of HEC-RAS and HEC-GeoRAS open-source software in the prediction of river stages, hence applicable for flood mitigation and management in developing countries under a scarcity of data, fund and skilled human resources.

Keywords: flood; HEC-RAS; hydrodynamic modelling; river stages.

DOI: 10.1504/IJHST.2022.126435

International Journal of Hydrology Science and Technology, 2022 Vol.14 No.4, pp.435 - 450

Received: 14 Jul 2020
Accepted: 10 Mar 2021

Published online: 26 Oct 2022 *

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