The Effect of Cylindrical and Triangular Pillars on Changes in Water Levels at Channel Bends

Abstract

The water level on the outer side of river bends rises and decreases on the inner side. This research, conducted at the Hydraulics Laboratory of the Engineering Faculty at Tadulako University, sought to analyze the effect of the shape of pillars placed in a U-shaped channel bend (180^o) on the water level. The pillars used were either cylindrical or triangular. A U-shaped channel was made from acrylic material with a width of 0.5 meters and radius of 0.75 meters. In order to analyze the effects of pillar shape on the maximum water height, the pillars were moved in increments of 60^o and installed simultaneously at bends of 30^o, 90^o, 150^o, and 0^o, 60^o, 120^o. The results show that the cylindrical and triangular pillars affected the water level at the outside of the bend. The maximum height always occurred at bends of 30^o. The cylindrical pillar was more economical than the triangular when installing on bridges at bends of 0^o or 120^o or installed simultaneously at bends of 30^o, 90^o, 150^o. The triangular pillar was more economical when installing on bridges at bends of 60^o or 180^o or installed simultaneously at the bends of 0^o, 60^o, 120^o.