Determination of Downstream Hydraulics Geometry Parameters

Abstract

The hydraulic geometry term represents the relation between the dynamic characteristics of a river stream and its discharge. The river characteristics quantitatively obtained by describing these parameters as power functions of discharge employing one coefficient and exponent. The aim of the study is determining the downstream hydraulic geometry parameters and to obtain a relation between flow discharge and sediment discharge with hydraulic geometry parameters of the channel. The depth, velocity, width, surface roughness and suspended sediment concentration data are collected at three selected stations along the channel. The results show that the downstream hydraulic geometry parameters for flow discharge relations b, f, m, p, a, c, k and N are discovered as 0.0417, 0.8889, 0.0789, 0.4580, 1.9842, 1.9710, 0.3693 and 1.8056, respectively. For sediment discharge relations, the hydraulic geometry parameters b, f, m, p, a, c, k and N are shown as − 0.0454, 0.9054, 0.3090, 0.1739, 1.1712, 2.1230, 0.3348 and 0.9325, respectively. The values of exponent and coefficient, (b, f, m, p, a, c, k and N) varies within some limits imposed more by ways the adjustment of stream power is dispersed across variables. This is because the scales parameters are varying and depends on the hydraulics parameters of channel. In addition, according to the results, the sediment and flow discharge relations at Station 1 were determined being more relevant than those at a different station when it comes to the correlation coefficient with average co coefficient and exponent of 0.75 and 0.25, respectively. Generally, the findings from this study are intended to be beneficial for manager and planner of water resources initiatives in the basin.