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اثر شکاف بر توپوگرافی بستر حول صفحه مثلثی متصل به ساحل در قوس 90 درجه | ||
| تحقیقات آب و خاک ایران | ||
| مقاله 3، دوره 48، شماره 5، بهمن 1396، صفحه 951-961 اصل مقاله (973.2 K) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22059/ijswr.2018.222081.667587 | ||
| نویسندگان | ||
| فرشید امیرسالاری میمنی* 1؛ احمد فتحی1؛ محمد محمودیان شوشتری2 | ||
| 1دانشگاه شهید چمران اهواز | ||
| 2دانشگاه شهید چمران اهواز | ||
| چکیده | ||
| آبشکنها اگرچه توانسته‌اند در حفاظت از قوس رودخانه‌ها عملکرد مناسبی داشته باشند، اما از روند آبشستگی موضعی حول دماغه مصون نیستند. تحقیقات اخیر نشان داده است که صفحات مثلثی متصل به ساحل به‌دلیل شکل هندسی سازه، نسبت به آبشکنها آبشستگی کمتری در دماغه ایجاد می‌کنند. ایجاد شکاف در سازه یکی از راه‌کارهای مهندسان در اصلاح الگوی جریان اطراف سازه می‌باشد. به‌منظور دست‌یابی به اهداف تحقیق حاضر شکافی مستطیلی با درصد بازشدگی برابر با 10 درصد سطح مؤثر صفحه و در موقعیت موازی با وتر، در صفحه‌ی مثلثی متصل به ساحل ایجاد شده است. سپس در زوایا و شرایط هیدرولیکی متفاوت (287/0، 304/0 و 322/0) اثر شکاف بر توپوگرافی بستر بررسی شده است. نتایج نشان داد متوسط درصد کاهش بیشینه عمق آبشستگی توسط شکاف ایجاد شده در زوایای 23، 30، 40 و 60 درجه به ترتیب 70، 20، 17و 54 درصد بوده است. همچنین شکاف باعث دور کردن چاله‌ی آبشستگی از ساحل بیرونی شده است. با افزایش عدد فرود جریان، بیشینه عمق آبشستگی در صفحات شاهد و شکاف دار، افزایش یافت. | ||
| کلیدواژه‌ها | ||
| قوس رودخانه؛ صفحه متصل به ساحل؛ شکاف؛ بیشینه عمق آبشستگی | ||
| عنوان مقاله [English] | ||
| The effect of slot on bed topography around the bank attached triangular vane in 90 degree bend | ||
| نویسندگان [English] | ||
| farshid amirsalari meymani1؛ ahmad fathi1؛ mohammad mahmoodian shooshtari2 | ||
| 1shahid chamran university of ahvaz | ||
| 2Shahid Chamran University of Ahvaz | ||
| چکیده [English] | ||
| Although the spur dikes have an appropriate performance to protect the rivers’ bank, these structures are not immune against the local scour around their tips. Recent researches have shown that the bank attached triangular vanes have less scour depth at their tips toward the spur dikes because of their geometrical shape. One of the methods to improve the flow pattern around the structures is creating slots in the structure to reduce the maximum scour depth around the structure’s tips. In order to achieve the purposes of the present study, a rectangular slot (with an opening percentage equal to 10 percent of the effective vane surface and the location of the slot being parallel to the chord) has been created in the bank attached triangular vane. Then the effect of the slot on the bed topography was analyzed at different angles and hydraulic conditions (0.287, 0.304 and 0.322). The research results showed that the average reduction of the maximum scour depth by means of a slot at the angles of 23, 30, 40 and 60 degrees have been 70, 20, 17 and 54 percent, respectively. Also, the created slot in the vane caused the maximum scour depth to be formed away from the outer bank. By increasing the Froude number, the maximum scour depth increased at sample-slotted vanes. | ||
| کلیدواژه‌ها [English] | ||
| River bend, Bank attached vane, Slot, Maximum scour depth | ||
| مراجع | ||
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Abdolahpour, M., Hassanpour, N. khosraviniya, p. and Hosseinzade Dalir, A. 2012. Effect of Slot on Reduction of Scouring Around the Vertical Abutment. Journal of Water and Soil Science. 23(3), 193-206. (In Farsi) Aghakhanei Afshar, A.H., Faghfoor Maghrebi, M. and Esmaili, K. 2010. Experimental investigation of effect of pier slot geometry and adjacent piers on reduction of local scour. 5th National Congress on Civil Engineering. Ferdowsi University of Mashhad. (In Farsi) Anon, 2008. Guidance of design and protection of river spur dike. No. 516. Ministry of Power. President Deputy Strategic Planning and Control. (In Farsi) Bahrami Yarahmadi, M. and Shafaei Bajestan, M. 2014. Bed topography variations in a 90° mild bend due to triangle-shaped spur dike. Journal of Modares Civil Engineering. 14(2), 165-203. (In Farsi) Chiew, Y. M. 1992. Scour Protection at Bridge Piers. Journal of Hydraulic Engineering. ASCE. 118(9). 1260-1269. Christensen, Z.M. 2009. Reduction of Local Scour around Bridge Piers: Combined System of Aerofoil and Slot. BS Thesis, Department of Engineering and Surveying. University of Southern Queensland. Heidarnejad, M., Shafai Bajestan, M. and Masjedi, A. 2010. The effect of slot on scouring around piers in different positions of 180 degree bends. Journal of World Applied Sciences.8(7), 892-899. Heidarpoor, M., Afzalimeher, H. and Nadernabi, M. 2001. Control and reduction of local scour in rectangular bridge piers by slot. Journal of Science and Technology of Agriculture and Natural Resources. 7(3), 23-27. (In Farsi) Hosseini, M. and Fathi, A. 2015. The effect of slot location on reduction of local scouring of the submerged triangular vane attached to the bank. Master of Civil Engineering Thesis. Faculty of Water Science Engineering. Shahid Chamran University of Ahvaz. (In Farsi) Izadi Niya, A., Heidarpoor. M. and Afzalimehr, H. 2007. Investigation of effect of slot in reduction of scour at rectangular bridge piers. 3th National Conference on Water Resources Management. Tabriz University. (In Farsi) Johnson, P. A., Hey, R. D. Tessier, M. and D. L. Rosgen. 2001. Use of vanes for control of Scour at vertical wall abutments. Journal of Hydraulic Engineering, 127(90), 772–778. Kardan, N. 2015. 3D numerical investigation of performance of pier couple-slot in flow pattern variation and bed shear stress around it. Journal of Marine Science and Technology. 76, 17-30. (In Farsi) Khodabakhshi. A., Saneie. M. and Abdekolahchi. A. 2012. Experimental investigation of effect of slot height from river bed surface on pier local scour. 11th Hydraulic Conference. Oromiye University. (In Farsi) Kumar, V. 1996. Reduction of scour around bridge piers using protection devices. PhD Thesis. University of Rookie. India. Kumar, V., Rang Raju, K.G. and Vittal, N. 1999. Reduction of Local Scour around Bridge piers Using Slot & Collars. Journal of Hydraulic Engineering. ASCE. 125(12), 1302-1305. Moncada, A.T., Aguirre, P.E.J. Bolivar, J.C. and Flores, E.J. 2009. Scour protection of circular bridge piers with collar and slots. Journal of Hydraulic Engineering Research. 47(1),119-126. Noorifar, M., Faghfoor Maghrebi, M. and Hassanzadeh, Y. 2010. Numerical comparison of reduction of local scour around slotted pier and separate couple-pier. 5th National Congress on Civil Engineering. Ferdowsi University of Mashhad. (In Farsi) Pir Mohammadi, D. 2004. Effect of slot on stability of riprap under control and reduction of local scour of bridge piers. Master of Water Engineering Thesis. Faculty of Agriculture. Esfahan University. (In Farsi) Soltani. S., Heidarpoor. M. and Afzalimehr, H. 2009. Control of pier local scour with and without slot in rectangular piers and single pier group. 8th Hydraulic Conference. Tehran University. (In Farsi)
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