Scholarlink

Channel roughness plays a critical role in the advancement of hydraulic models used for predicting floods and flood inundation maps. This study presents application of a hydrodynamic model aimed at calibrating the Manning’s roughness coefficient (n) for the lower Tapi river in India. The outflows from the Ukai dam and the tidal levels in the Arabian Sea are considered as the upstream and downstream boundary conditions, respectively. The calibration of Manning’s \(n\) has been performed by taking global as well as distributed parameters, i.e., Ukai dam to Kakrapar and Kakrapar to the Arabian sea, for the selected reaches of river. After several trials, the Manning’s value of 0.035 from Ukai dam to Kakrapar and 0.02 from Kakrapar to the Arabian sea are found better with the lowest weighted RMSE. In most of the gauging stations, it is found that simulated water level is higher than the observed water levels. The calibrated Manning’s \(n\) values have been found to perform well in validation of independent flow event, and the same can be used for design of levees as flood protection measures for the lower Tapi river.

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Distributed Manning’s Roughness Approach in Calibration and Validation of 1-D Hydrodynamic Model of Lower Tapi River, India

  • 章节

  • 发表日期：

    2025年

查看全文
  • Sandipkumar Rajput,
  • Prem Lal Patel

摘要

Channel roughness plays a critical role in the advancement of hydraulic models used for predicting floods and flood inundation maps. This study presents application of a hydrodynamic model aimed at calibrating the Manning’s roughness coefficient (n) for the lower Tapi river in India. The outflows from the Ukai dam and the tidal levels in the Arabian Sea are considered as the upstream and downstream boundary conditions, respectively. The calibration of Manning’s \(n\) has been performed by taking global as well as distributed parameters, i.e., Ukai dam to Kakrapar and Kakrapar to the Arabian sea, for the selected reaches of river. After several trials, the Manning’s value of 0.035 from Ukai dam to Kakrapar and 0.02 from Kakrapar to the Arabian sea are found better with the lowest weighted RMSE. In most of the gauging stations, it is found that simulated water level is higher than the observed water levels. The calibrated Manning’s \(n\) values have been found to perform well in validation of independent flow event, and the same can be used for design of levees as flood protection measures for the lower Tapi river.