انجمن هیدرولیک ایران نشریه علمی هیدرولیک 2345-4237 6 4 2012 01 21 Armoring Effect on Local Scouring around the Bridge Pier under (Part1 :) Steady Flow مطالعه تاثیر لایه سپری بر آب شستگی پایه پل، تحت اثر جریان دائمی (بخش یکم) 59 75 85409 10.30482/jhyd.2012.85409 FA عبدالرضا کبیری سامانی دانشیار، دانشکده مهندسی عمران، دانشگاه صنعتی اصفهان 0000-0002-5984-3892 Journal Article 2011 03 21 In this study armoring effect on local scouring around bridge pier under steady flow condition was<br />investigated based on model experimentation. Different combinations of bed-armor layers were<br />employed. Three circular piers of 22, 33 and 42 mm were used. Results show that while small bed<br />particles are under the protective effect of armor layer, increasing the total scouring depth, yields an<br />increase in the secondary armor layer depth until the armor layer itself is not influenced by the horseshoe<br />vortices. The minimum stabilized secondary armor layer is identical to the armor grain size.<br />Results showed that there is not meaningful correlation between total scouring depth and B/d (where B<br />is the pier diameter and d is the mean bed grain sizes) for B=33 and 42 mm. However for B=22 mm,<br />increasing B/d tends to increase the total scouring depth. For the armor layer particles size of 2.36 mm<br />the armoring effect for B=22 mm is vanished. The most important parameters in evolution of scouring<br />depth are the armor layer grain size and the armor layer thickness. https://jhyd.iha.ir/article_85409_f0f915de822b7ed9230c5c4a7998210b.pdf