@article { author = {Maherani, M. and Kabiri-Samani, Abdorreza and Afzalimehr, H.}, title = {Armored Layer Bed Effect on Local Scouring Around Bridge Abutment}, journal = {Journal of Hydraulics}, volume = {5}, number = {1}, pages = {1-19}, year = {2010}, publisher = {Iranian Hydraulic Association}, issn = {2345-4237}, eissn = {2645-8063}, doi = {10.30482/jhyd.2010.85415}, abstract = {In this study the effects of armored-bed layer on local scouring around semi-circular and semiellipticalabutments have been studied based on model experimentation. The main objective of thisresearch includes the effect of armor layer on mechanism of clear-water scouring around bridgeabutments. Experiments were performed under different conditions such as bed shear velocities, flowdepths, dimension and shape of abutments, as well as grain size of the bed and armor layer materials ina glass-wall channel of 6.5 m length, 0.3 m width and 0.3 m height. Two types of abutments, semicircularand semi-elliptical with b/l=3 and 2 respectively were used. Results show that by increasingthe bed material diameter for a constant armor layer, maximum scouring depth (dsa) increases and byincreasing the grain size of the armor layer for a constant bed layer, dsa decreases. For a given armorlayer thickness, by increasing the grain size of the bed layer, dsa increases. While small bed particlesare under the protective effect of armor layer, increasing the water velocity increases the secondaryarmor layer depth provided that the armor layer itself is not influenced by the flow. The maximumscour depth for semi-elliptical abutment is less than that of semi-circular abutment.}, keywords = {}, title_fa = {بررسی آب شستگی در اطراف تکیه گاه پل ها د رحضور لایه سپری}, abstract_fa = {}, keywords_fa = {}, url = {https://jhyd.iha.ir/article_85415.html}, eprint = {https://jhyd.iha.ir/article_85415_5f9334a06cc3a68cef69b1a750587033.pdf} }