TY - JOUR ID - 85409 TI - Armoring Effect on Local Scouring around the Bridge Pier under (Part1 :) Steady Flow JO - Journal of Hydraulics JA - JHYD LA - en SN - 2345-4237 AU - Kabiri-Samani, Abdorreza AD - Associate Professor, Department of Civil Engineering, Isfahan University of Technology Y1 - 2012 PY - 2012 VL - 6 IS - 4 SP - 59 EP - 75 DO - 10.30482/jhyd.2012.85409 N2 - In this study armoring effect on local scouring around bridge pier under steady flow condition wasinvestigated based on model experimentation. Different combinations of bed-armor layers wereemployed. Three circular piers of 22, 33 and 42 mm were used. Results show that while small bedparticles are under the protective effect of armor layer, increasing the total scouring depth, yields anincrease in the secondary armor layer depth until the armor layer itself is not influenced by the horseshoevortices. The minimum stabilized secondary armor layer is identical to the armor grain size.Results showed that there is not meaningful correlation between total scouring depth and B/d (where Bis the pier diameter and d is the mean bed grain sizes) for B=33 and 42 mm. However for B=22 mm,increasing B/d tends to increase the total scouring depth. For the armor layer particles size of 2.36 mmthe armoring effect for B=22 mm is vanished. The most important parameters in evolution of scouringdepth are the armor layer grain size and the armor layer thickness. UR - https://jhyd.iha.ir/article_85409.html L1 - https://jhyd.iha.ir/article_85409_f36616e560805a216a780930cbac9dcb.pdf ER -