Civil and Project

A Study of Calculation Manning Roughness Methods: The Case of a Small River in Southwestern Iran

https://doi.org/10.22034/cpj.2022.365058.1162
Volume 4, Issue 7 - Serial Number 41
October 2022
Pages 11-16
Civil and Project

Document Type : Research Article

Authors

S.Mohamad Sadegh Rasooli 1
Amirhossein Bazaee 2
Roozbeh Aghamajidi 3

1 Master's student in Civil Engineering, Islamic Azad University, Sepidan Branch, Fars, Iran

2 Instructor, Department of Civil Engineering, Faculty of Engineering, Technical and Vocational University (TVU), Tehran, Iran

3 Assistant Professor, Faculty of Engineering, Islamic Azad University, Sepidan Unit, Fars, Iran

Abstract
Affected by numerous elements, the estimation of manning's roughness coefficient is of great importance and sensitivity. In the present study a reach of 56 km from beshar river in kohgiluyeh and boyer-ahmad province was studied. The selected reach was divided into 12 sub-reaches based on similar characteristics. Experimental and quasi-experimental methods, tables, and cowan's method were used to estimate manning's coefficient. The estimation results were compared with stage-discharge rating curves from two hydrometric stations located in the selected reach. The ‘inverse solution’ was proved to be the best method to estimate manning's coefficient in the river under study followed by bruschin and cowan's method with an average error of 0.237 and 0.241, respectively.

Keywords

Manning's coefficient
Inverse solution method
Beshar river
HEC-RAS
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  • Receive Date 09 October 2022
  • Revise Date 27 October 2022
  • Accept Date 27 October 2022
  • First Publish Date 27 October 2022
  • Publish Date 23 September 2022

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