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Abstract <p>Floods devastate lives and properties; therefore, assessing flood risk is critical. In this study, the Jakham River’s flow behaviour, a Mahi River tributary, is investigated to predict the occurrence of flood and to develop flood inundation maps for the study region. Banswara and Pratapgarh districts of Rajasthan, India, are considered for the study. Open-source HEC-RAS software with a GIS interface is used to obtain the flow behaviour, and both steady and unsteady approach is employed for the flow modelling. Gumbel’s flood frequency analysis is performed for steady analysis, considering the annual discharge data of the last 30&#xa0;years to obtain the amount of discharge for various return periods. The hydrodynamic model is developed for the 53 km length of the River from Dhariawad to Paderdibadi. River geometry at appropriate intervals is constructed using the SRTM digital elevation model of 30 m resolution. The model is validated with data from the Central Water Commission, India, for 2014. The value of channel roughness is calibrated by comparing the flow and stage with the observed data for the Rangeli site. Hydraulic parameters such as depth of water, velocity, water surface elevation, and inundation area are obtained and analyzed using the results of 1D simulation. The model results are used to create flood inundation probability maps that may be useful for flood mitigation and management.</p>

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Flow Modelling of Jakham River Reach Using HEC-RAS

  • 期刊论文

  • 发表日期：

    2025年2月1日

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  • Manoj Kumar Diwakar,
  • Nitesh Gehlot

摘要

Abstract

Floods devastate lives and properties; therefore, assessing flood risk is critical. In this study, the Jakham River’s flow behaviour, a Mahi River tributary, is investigated to predict the occurrence of flood and to develop flood inundation maps for the study region. Banswara and Pratapgarh districts of Rajasthan, India, are considered for the study. Open-source HEC-RAS software with a GIS interface is used to obtain the flow behaviour, and both steady and unsteady approach is employed for the flow modelling. Gumbel’s flood frequency analysis is performed for steady analysis, considering the annual discharge data of the last 30 years to obtain the amount of discharge for various return periods. The hydrodynamic model is developed for the 53 km length of the River from Dhariawad to Paderdibadi. River geometry at appropriate intervals is constructed using the SRTM digital elevation model of 30 m resolution. The model is validated with data from the Central Water Commission, India, for 2014. The value of channel roughness is calibrated by comparing the flow and stage with the observed data for the Rangeli site. Hydraulic parameters such as depth of water, velocity, water surface elevation, and inundation area are obtained and analyzed using the results of 1D simulation. The model results are used to create flood inundation probability maps that may be useful for flood mitigation and management.