Roughness Coefficient Study Based on Discharge of Various Rivers of Bangladesh

Abstract

As a result of the rapid growth of water asset projects and pressure-driven design work throughout the world, the expectation of water roughness coefficient is becoming a significant factor for pressure-driven related design plans such as open channels and dam structures. The aims of this research are to determine how roughness affects discharge and to observe the variables that impacts roughness coefficient. This paper explores the roughness co-efficient of Bangladeshi streams as a function of discharge. One of the important exact limits in the field of Hydrology and Hydraulics is the roughness coefficient. Several theorists have suggested different observational conditions for assessing the roughness co-efficient. In this proposed study, the confining qualities of different rivers in Bangladesh are regulated by using Manning's roughness coefficient 'n', Chezy's resistance factor 'C', and Darcy Weisbach friction factor 'f', demonstrating that these are strongly based on the release of streams. The roughness limit, on the other hand, exhibits a cyclic variation between two terms over the course of the year. According to the research, larger flow rates are created during heavy rainfall seasons with lower roughness coefficient and less retarding impact on the water flow. In conclusion, bed roughness impacted flow rate and roughness coefficient. The roughness boundaries 'n' and 'f' are highest in the dry season, while Chezy's 'C' is the polar opposite and vice versa in the rainy season. The findings of this study prevailed that as Manning's roughness coefficient and Darcy Weisbach friction factor extended, the discharge reduced, which was the opposite of Chezy's roughness coefficient.