Study Factors Influencing the Hydraulic Roughness Coefficient of the Karun River (Iran)
Journal Title: International Journal of Farming and Allied Sciences - Year 2013, Vol 2, Issue 22
Abstract
One of the factors effective in calculating discharge is Manning’s roughness coefficient. Due to the importance of the effect of this parameter, its precise determination represents the actual channel bed conditions and is effective in increasing the precision of the results of hydraulic calculations. The purposes of conducting this research were to study factors influencing the hydraulic roughness coefficient of the Karun river and to find a method for its determination under different conditions. We chose a section of this river between the Mollasani and Ahwaz stations (where good quality data was available) and employed the direct method to achieve these goals. In this method, observational data (slope, cross – sectional areas, particle – size distribution on the bed…) is gathered. The employment of our proposed method, in which new equations are used for these two stations, can result in determining the appropriate n values (and hence in obtaining exact and close – to – reality estimates of the discharge of the river). Results we found were compared with those observed by using empirical relations, including the relations introduced by Limerinous , Henderson , Strickler , Barry , Julien , Meyer – Peter, and Muller, with those found by using Cowan’s tables , and with those obtained by employing the analytical method.
Authors and Affiliations
Reza Soltani Fard, Mohammad Heidarnejad, Narges Zohrabi
Keywords
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