پیوندهای مفید
اخبار و اعلانات
آمار
| تعداد نشریات | 161 |
| تعداد شماره‌ها | 6,532 |
| تعداد مقالات | 70,504 |
| تعداد مشاهده مقاله | 124,121,650 |
| تعداد دریافت فایل اصل مقاله | 97,228,882 |
تأثیر ارتفاع و شیب تاج سرریزهای مستغرق بر الگوی فرسایش و رسوب در قوس 90 درجه تند | ||
| تحقیقات آب و خاک ایران | ||
| دوره 52، شماره 3، خرداد 1400، صفحه 621-633 اصل مقاله (1.13 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22059/ijswr.2021.314849.668821 | ||
| نویسندگان | ||
| محسن صالح زاده1؛ محمد همتی* 2؛ مهدی یاسی3؛ استفان لانزونی4 | ||
| 1گروه مهندسی آب،دانشکده کشاورزی و منابع طبیعی، دانشگاه ارومیه، ارومیه، ایران. | ||
| 2گروه مهندسی آب، دانشکده کشاورزی و منابع ظبیعی، دانشگاه ارومیه، ارومیه، ایران | ||
| 3گروه مهندسی آبیاری و آبادانی، دانشکده مهندسی و فناوری کشاورزی، دانشگاه تهران،کرج، ایران | ||
| 4گروه مهندسی عمران، محیط زیست و معماری، دانشکده فنی مهندسی، دانشگاه پادوا، پادوا، ایتالیا | ||
| چکیده | ||
| سرریزهای مستغرق سازههایی با ارتفاع کوتاه هستند که کاملاً زیر سطح آب قرار داشته و جهت بهبود شرایط کشتیرانی، ایجاد زیستگاه آبزیان، کنترل جابجایی قوس‌ها و ... احداث می‌شوند. هدف این تحقیق ارزیابی کارایی سرریزهای مستغرق بر الگوی فرسایش و رسوبگذاری در قوس 90 درجه تند می‌باشد. به‌منظور رسیدن به این هدف مجموعهای از سرریزها با ارتفاع نسبی 30 و 70 درصد و شیب تاج صفر و 7 درصد در دیواره قوس خارجی احداث شدند. زاویه، طول و فاصله بین سرریزها ثابت در نظر گرفته شد. نتایج نشان داد که سرریزهای با ارتفاع نسبی 70 درصد و شیب تاج صفر بهترین عملکرد را در حفاظت بستر نزدیک دیواره قوس خارجی داشت. با احداث این سازهها در قوس، 7 درصد رسوبگذاری نزدیک دیواره خارجی در مقطعی که منطبق بر محل ماکزیمم آبشستگی در حالت شاهد بود، صورت گرفت. تغییر در ارتفاع و شیب تاج سرریز مستغرق اثر قابل‌ملاحظه‌ای بر کاهش ماکزیمم ارتفاع نسبی تپه رسوبی نداشت و فقط در فرود 43/0 به‌طور متوسط ماکزیمم ارتفاع نسبی تپه رسوبی 10 درصد کاهش پیدا کرد. علاوه بر آن، با افزایش ارتفاع و شیب تاج سرریزهای مستغرق ماکزیمم عمق نسبی آبشستگی در دماغه سرریز سوم به ترتیب 11 درصد افزایش و 6 درصد کاهش پیدا کرد. | ||
| کلیدواژه‌ها | ||
| آبشستگی؛ تپه رسوبی؛ خط‌القعر؛ دیواره خارجی؛ دیواره داخلی | ||
| عنوان مقاله [English] | ||
| The Effect of Height and Crest Slope of the Submerged Weirs on Erosion and Sedimentation Pattern in a 〖90〗^o Sharp Bend | ||
| نویسندگان [English] | ||
| MOHSEN SALEHZADEH1؛ Mohammad Hemmati2؛ Mehdi Yasi3؛ STEFANO LANZONI4 | ||
| 1Department of Water Engineering, faculty of agriculture and natural resources, Urmia University, Urmia, Iran | ||
| 2Department of Water Engineering, faculty of irrigation and natural resources, Urmia University, Urmia, Iran | ||
| 3Department of Irrigation and Reclamation Engineering, faculty of agricultural engineering and technology, University of Tehran, Karaj, Iran | ||
| 4Department of Civil, Environmental , and Architectural Engineering ICEA, faculty of engineering, University of Padua, Padua, Italy. | ||
| چکیده [English] | ||
| Submerged weirs are short-height structures that are completely beneath the water surface and are constructed to improve shipping conditions, create aquatic habitats, control the movement of bends, etc. The purpose of this study was to evaluate the patterns of erosion and sedimentation at a 90o sharp bend. To achieve this goal, a series of weirs with the relative heights of 30% and 70% and crest slopes of 0 and 7% were constructed on the outer wall of the bend. The angle, length, and distance between weirs were kept constant. The results showed that bendway weirs with a relative height of 70% and a flat crest slope had the best performance in protecting the bed near the outer bend wall. With the construction of these structures in the bend, 7% of sedimentation was done near the outer wall at a cross-section corresponding to the maximum scour location in the unstructured state. Changes in the height and crest slope of the bendway weir did not have a significant effect on reducing the maximum relative height of point-bar, and only at Froude number of 0.43 the average maximum relative point-bar height decreased by 10%. Moreover, with increasing the height and crest slope of the weirs, the maximum relative scours depth at the nose of the third weir increased by 11% and decreased by 6%, respectively. | ||
| کلیدواژه‌ها [English] | ||
| Inner wall, Outer wall, Point-bar, Scour, Thalweg | ||
| مراجع | ||
|
Abad, J., Rhoads, B., Guneralp, I., and Garcia, M. (2008). Flow structure at different stages in a meander-bend with bend way. J. Hydraul. Eng. ASCE. 134(8): 1052-1064. Acharya, K. and Gautam, M. (2012). Evaluation of bendway weir bank stabilization techniques for stream restoration. International Journal of River Basin Management, 10 (2), 171–176. Charlton, R. (2008). Fundamentals of fluvial geomorphology. Routledge, New York, NY, pp. 234p. Cleven, S. (2008). Bendway weir – an alternative approach to traditional river a lignment training techniquse. Cunningham, R. and Lyn, D. (2016). Laboratory study of bendway weirs as a bank erosion countermeasure. J. Hydraul. Eng. 142 (6), 04016004. Darabi, P., Hemmati, M. and Haghdoust, N.A. (2017). Effect of bendway weirs height on scour and sedimentation pattern at a 90 degree bend. Journal of Irrigation and Drainage Structures Engineering Research, 18(68), 51-66. (In Farsi) Derrick, D. L. (1997). Bendway weirs redirect rivers to protect highway bank abutments. Vicksburg, MS: US Army Corps of Engineers, Waterways Experiment Station. Derrick, D. L. (1999). Bendway weir history, theory and design. From: http://chl.wes. army. mil/research/hydstruc/bankprotect/bendweir/work.htp Dietrich, W. E. (1987). Mechanics of flow and sediment transport in river bends. River channels: Environment and process, K. S. Richards, ed., Blackwell, Oxford, UK, 179–227. FHWA, (1997). Bridge scour and stream instability countermeasures (SI). Federal Highway Administration, Hydraulic Engineering Circular Number 23, FHWA HI-97-030. Fischenich, J. C. and Allen, H. A. (2000). Stream Management. ERDC/EL SR-W-00-1. U.S. Army Engineer Research and Development Center. Vicksburg, MS. Hemmati, M., Ghomeshi, M. and Kashefipour, S. M. (2012a). Experimental investigation on the effect of angle of bendway weirs on erosion and sedimentation pattern in meander river. Journal of Iranian Water Resource Research, 8(3), 66-73. (In Farsi) Hemmati, M., Ghomeshi, M., Kashefipour, S.M., Shafai-Bejestan, M. and Lanzoni, S. (2012b). Experimental investigation of the effects of angle and length of bendway weirs on scouring and sedimentation in a meander river. J. Am. Sci, 8 (9), 912–917. Hemmati, M., Kashefipour, S. M. and Ghomeshi, M. (2013). Experimental Study on the effects of bendway weirs length on sediment process and water level in a meandering river. Journal of Civil and Environmental Engineering, 43(1), 51-60. (In Farsi) Hemmati, M., Ghomeshi, M., Ahmadi, H. and Lanzoni, S. (2016). Scour depth around flat and sloped crest bendway weirs: a laboratory study. Int. J. River Basin Manage, 14 (1). 83–93. Hemmati, M. and Darabi, p. (2019). Erosion and sedimentation patterns associated with restoration structures of bendway weirs. Journal of Hydro-environment Research, 19-28. Jamieson, E.C., Rennie, C.D. and Townsend, R.D. (2013). 3D flow and sediment dynamics in laboratory channel bend with and without stream barbs. J. Hydraul. Eng, 139 (2), 154-166. Jarrahzade, F.,Ramesh, S., Mashkoorniya, H. and Shafai-Bejestan, M. (2010). Experimental investigation of the effect of distance between bendway weirs on bed scour in a 90 degree sharp bend. In: Proceedings of 9th Iranian hydraulic conference, 9-11 Nov., Tarbiat Modares University, Tehran, Iran. (In Farsi) Jarrahzade, F. and Shafai Bejestan, M. (2012). Experimental investigation of thalweg under effect of submerged weirs in a 90 degree sharp bend. Watershed Management Research (Pajouhesh & Sazandegi), 97, 17-29. (In Farsi) Kashyap, S., Constantinescu, G., Rennie, C. D., Post, G. and Townsend, R. (2012). Influence of channel aspect ratio and curvature on flow, secondary circulation, and bed shear stress in a rectangular channel bend. Journal of Hydraulic Engineerihg. ASCE, 138:1045-1059. Lagasse, P. F., Byars, M. S., Zevenbergen, L.W.and Clopper, P. E. (1997). Bridge scour and stream instability countermeasures: experience, selection, and design guidance. FHWA. Hydraulic Engineering Circular No. 23, FHWA HI-97-030 HEC-23. Lee, S. K., Dang, T. A. and Le, V. T. (2019). Investigation of shear stress distribution in a 90 degree channel bend. J. of Applied Mechanics and Engineering, 24(1), 213-220. Mashkoornia, H., Shafai-Bejestan, M., Jarrahzade, F. and Ramesh, S. (2010). Experimental study on bendway weirs. . In: Proceedings of / the International Conference on Fluvial Hydraulics. River Flow 2010 - Dittrich, Koll, Aberle & Geisenhainer (eds) - © 2010 Bundesanstalt für Wasserbau ISBN 978-3-939230-00-7. Mashkoorinia., H. and Shafai Bejestan., M. (2015). Investigation of the effect of bendway weir length on bed topographic changes in 90 ° sharp bend. Iranian Water Research Journal, 9(2), 159-163. (InFarsi) Maza Alvarez, J.A. (1989). Design of groynes and spur dikes. In: Proceedings of / the 1989 National Conference on HydraulicEngineering, 14–18August,New Orleans, Louisiana, 296–301. Matsuura, T. and Townsend, R. (2004). Stream-barb installations for narrow channel bends—A laboratory study. Can. J. Civ. Eng, 31(3), 478–486. Minor, B., Rennie, C. D. and Townsend, R. D. (2006).’Barbs’ for river bend bank protection: Application of a three-dimensional numerical model. Can. J. Civ. Eng, 34(9), 1087–1095. Ramesh, S., Jarrahzade, F., Mashkooriniya, H. and Shafai-Bejestan, M. (2010). Longitudinal profile position of erosion and sedimentation under the influence of bendway weir in 90 degree sharp bend. In: Proceedings of / 9th Iranian hydraulic conference, 9-11 Nov., Tarbiat Modares University, Tehran, Iran. (In Farsi) Rozovskii, I.L. (1957). Flow of water in bends of open channels. Academy of Sciences of the Ukrainian SSR. Kiev. 233 p. Rutherfurd, I., Jerie, K., and March, N. (1999). A rehabilitation manual for Australian Stream. Volumc One, Cooperative Research Center For Catchment Hydrology. Smith, S. P. and Wittler, R. J. (1998). Bendway weirs and highway protection in Colorado: A case study on the Blue River. Proc., ASCE Int. Water Resources Engineering Conf.: Water Resources Engineering ‘98, ASCE, Washington, DC, 465–470. Uijttewaal, W.S. (2005). Effects of groyne layout on the flow in groyne fields: laboratory experiments. J. Hydraul. Eng, 131 (9), 782–791. Vaghefi, M., Ghodsian, M. and Azimi, A. (2013). Numerical Study Scour Pattern on Channel Bend Using Flow-3D Software. Quarterly Journal of Environmental Erosion Researches, 9, 59-72. (In Farsi)
| ||
|
آمار تعداد مشاهده مقاله: 397 تعداد دریافت فایل اصل مقاله: 336 |
||