The model of pillar scouring protective using concave-sided curtain

Rivers posses dynamic characteristics that may change accordingly. During equilibrium state, the river flow can be potentially disrupted by the presence of bridge piers causes changing in the patterns of river flow and vortex formation around the pillar which eventually results in pillar scour. This study aims to determine the effect of the water flow velocity on the spacing lengthwise and distance transverse of the pillar using curtain variation technique; to investigate the basic alteration of elongated and transverse distance of the curtain before and after the placement curtain model on the pillars; and to compare between the depth of pillar scour resulted in this study and that observed in empirical research. This is an experimental study using three different models including a land line model with a cross-section shape of the trapezium, hekxagonal pillar and curtain sided concave models. The observation was performed towards the flow rate (Q), the flow velocity (v), flow depth (h), the elevation depth of scour (ds) for a specified time. The results show that the flow rate tends to decline from 0.50 m/sec., and reduced to 0.20 m / sec after passing through the curtain. The alteration of channel base around the pillar tend to decrease after the placement of curtain models. Before the placement of various curtain models, the depth of scour base ranges from (ds) 4-6 cm, and this number changed to 0.5 cm - 1.5 cm after the placement of curtain model in front of the pillars.