A model for removing sediments from open channels

Abstract

The problems caused by suspended sediment overloading in open channels are of great importance to the hydraulic engineers. One of the important problems caused by the sediment overloading during flood seasons is the change in bed level and corresponding water level of rivers due to its deposition on the river bed. At the upstream reaches, the bed slope is high, velocity is high and hence the rivers carry large amount of sediment during flood seasons. In this paper, eighty-one experiments on a laboratory open-channel of cross-section dimensions (20*50) cm and (10) m long. The experiments include using sharp crested weir in the last third part of the channel. Three heights of weir are used; namely half width of channel (B), equal to the width, and 1.5 times the width of channel). Also, three bed slopes of the channel are used; namely 0.015, 0.0225, and 0.03). In all experiments, the values of discharge are limited between 100 and 300 l/min. The concentration of suspended sediment is measured upstream and downstream the weir through each experiment to calculate the sediment reduction ratio (SRR%). The results of the laboratory experiments showed that the sediment reduction ratio increases with the increase of weir height and reaches about (63%) at a channel bed slope of (0.015) and a weir height 1.5B. When the discharge is more than (100 l/min), the highest values of sediment reduction ratio are obtained for the three slopes used and at weir height of 1.5B.

Hydraulic Model Prediction of the Total Load of Sediment Transport in The Euphrates River at The Upstream Ramadi Barrage

“…The particles will continue to move If the hydrodynamic force is sufficient to maintain the transportation. Furthermore, as soon as the hydrodynamic forces are reduced to the point where they can no longer move the particles, the sediment particles will cease moving and come to rest [18,19]. The majority of the wash load material in the Euphrates River within the study area originates from surface runoff following the intense rainstorms that fall on the catchments in the desert upstream of the study area.…”

The Influence of the Channel Bed Rectangular Configuration on Sediment Transportation

“…Such structures usually face problems such as seepage water, erosion, and maximum unwanted load. Sediment transportation is one of the main problems associated with reservoirs and open channel structures as the channel bed level and water velocity variations due to sediment overloading, particularly during floods transportation is one of the main problems Furthermore, slope and water velocity increase the sediment transportation rate [2]. Sediment transportation is the hydrological process of particle transportation along waterways such as channels and rivers and occurs when the stabilizing resistance force is weaker than the shear resistance.…”

Development of Inverse Mathematical Model of Rouse Formula to Estimate Suspended Sediment Concentration Along Width of Channel

“…The most significant problem caused due to excess sediment during flood seasons is rising of river bed level and consequently the water level because of deposition. At the upper sections, the bed slope is steep, velocity is high henceforth rivers take a heavy amount of sediment during the floods [6].…”