Statistical Evaluation of Turbulence Variables for Flow Characteristics

Abstract

Flood management requires an established technique for effectiveness. Flow nature and the degree of flood risk can be determined by statistical methods. Because of the multi-scale physical phenomenon of turbulent flow, such flow represents a significant parameter in flood hazard risk which exposes the environment to an undesirable event. Such flow can also be expressed using statistical methods as numerical index of a risk. This paper aims to determine flow characteristics and evaluation of open channel turbulence statistics in an idealized open channel. A high resolution turbulent measurement over the gravel and vegetated bed were made using the acoustic Doppler velocimeter (ADV), turbulent quantities were investigated through probability density distribution of turbulent velocities, turbulent intensities, autocorrelation and Reynold shear stresses. The results of this study will be useful to hydraulic engineers for river management and flood risks assessment and mitigation.