توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقاله‌های نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده می‌شوند.
۱Use of cable to prevent local scouring around bridge pier
نویسنده(ها): ،
اطلاعات انتشار: نهمین کنگره بین المللی مهندسی عمران، سال
تعداد صفحات: ۷
Scouring is a natural phenomenon caused by erosive action of flowing water on the bed. The formation of a scour hole around bridge piers has been the subject of intensive research for many years. Researchershave been introduced a lot of techniques to prevent and reduce local scour at bridge piers. In this paper reduction of scour around circular piers using cable have been carried out and compared with single pier for the case of clear–water flow over uniform sediment. The efficiency of cables, with different diameters and thread angles are studied through the experiments. The result indicated that cable act as a roughness and transits the laminar flow to turbulent flow and pushes separating point to ward downstream and reduces the strength of wake vortex. In addition cable reduces the strength of down flow and horseshoes vortex, therefore cable is shown to be effective in reducing scour depth. The results showed that with increasing cable diameter and decreasing thread angles the reduction of scour depth increases<\div>

۲Comparison of Different Configurations of Air–bubble Screens around the Pier to Control Scour
نویسنده(ها): ،
اطلاعات انتشار: دهمین کنگره بین المللی مهندسی عمران، سال
تعداد صفحات: ۷
Scouring is a natural phenomenon caused by erosive action of flowing water on the bed. The formation of a scour hole around bridge piers has been the subject of intensive research for many years. Researchers have been introduced a lot of techniques to prevent and reduce local scour at bridge piers. In present study, a new method to reduce scouring around piers has been assessed. A bubble–screen located around the pier are used to counteract the downward flow and avoid the initiation of scour. In addition the capability of bubble–screens in front half of the pier has been assessed and compared with a complete bubble–screen around the pier. Results indicate that the complete bubble–screen is more efficient than the bubble–screens in front half of the pier<\div>
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