نشریه مهندسی عمران امیرکبیر

نشریه مهندسی عمران امیرکبیر

تأثیر بلوک روی سازه‌ی تونلی موجود در سرریز کلیدپیانویی بر آبشستگی موضعی پایین‌دست آن

نوع مقاله : مقاله پژوهشی

نویسندگان
وادی محمد وادی 1
علی خوش فطرت 2
موسی حبیب‌ جاسم 3
نیلوفر سالمی 2
1 گروه مهندسی عمران، واحد اصفهان (خوراسگان)، دانشگاه آزاد اسلامی، اصفهان، ایران.
2 گروه مهندسی عمران، واحد اصفهان (خوراسگان)، دانشگاه آزاد اسلامی، اصفهان، ایران
3 گروه مهندسی عمران، دانشکده مهندسی، دانشگاه کربلا، کربلا، عراق
10.22060/ceej.2026.24423.8305
چکیده
سرریزهای کلیدپیانویی، شکل جدیدی از سرریزهای کنگره‌ای و به‌صورت غیر خطی هستند. به‌دلیل راندمان بالای این سرریزها در عبور جریان؛ بررسی آبشستگی موضعی و راهکار برای کاهش آن دارای اهمیت فراوانی است. در تحقیق حاضر از بلوک با هندسه متفاوت در کلیدهای خروجی تونل‌دار سرریز کلیدپیانویی مستطیلی نوع B استفاده شد. سرریز کلیدپیانویی مورد استفاده با ارتفاع 0/20 متر و دارای سه سیکل (سه کلید خروجی، دو کلید ورودی و دو نیم‌کلید ورودی) است. بلوک‌ها با هندسه‌های مکعب مستطیلی، ذوزنقه‌ای و استوانه‌ای در هر کلید خروجی سرریز و روی سازه‌ی تونلی نصب شدند. سازه‌ی تونلی، باعث عدم اختلاط جریان خروجی از کلیدهای ورودی و خروجی می‌شد. بلوک‌ها، جریان و بیشینه عمق آبشستگی را به فاصله‌ی دورتری از پنجه سرریز هدایت می‌کنند و مانند مانعی در برابر جریان عمل کرده و سرعت جریان خروجی از کلیدها را کاهش می‌دهند. فاصله دورتر بیشینه عمق آبشستگی از پنجه سرریز، می‌تواند باعث کاهش خطر واژگونی سرریز شود. در بلوک‌های مستطیلی، بیشینه عمق آبشستگی کاهش بیشتری یافته و محل آن از پنجه سرریز دورتر می‌گردد. همچنین با افزایش عدد فرود ذرات، با افزایش دبی جریان و کاهش عمق پایاب، بیشینه عمق آبشستگی افزایش می‌یابد. محدوده عدد فرود ذرات در تحقیق حاضر بین 0/43 تا 0/55 متغیر است. در نهایت از آنالیز ابعادی برای محاسبه بیشینه عمق آبشستگی استفاده شد.
کلیدواژه‌ها
کلیدهای خروجی
شاخص آبشستگی
مستطیلی
نوع B
هندسه متفاوت بلوک
موضوعات

عنوان مقاله English

Effect of Blocks on Tunnel Structures on Local Scour Downstream of Piano Key Weirs

نویسندگان English

Wadi Mohammed Wadi 1
ali khoshfetrat 2
Musa Habib Jasim 3
niloofar salemi 2
1 Department of Civil Engineering, Isf.C., Islamic Azad University, Isfahan, Iran
2 Department of Civil Engineering, Isf.C., Islamic Azad University, Isfahan, Iran
3 Department of Civil Engineering, Faculty of Engineering, University of Karbala, Karbala, Iraq
چکیده English

Piano key weirs are a new type of non-linear labyrinth weirs. Due to the high efficiency of these weirs in flow passage, it is of great importance to investigate local scour and the solution to reduce it. In the present study, different block geometries were used in the tunneled outlet keys of the rectangular piano key weir type B. The piano key weir used is 0.20 m high and has three cycles (three outlet keys, two inlet keys, and two inlet half keys). Rectangular, trapezoidal, and cylindrical block geometries were installed in each outlet key of the weir and on the tunnel structure. The tunnel structure prevented the flow exiting from the inlet and outlet keys from mixing. The blocks direct the flow and the maximum scour depth to a distance further from the weir toe, acting as a barrier to the flow and reducing the velocity of the flow exiting from the keys. A further distance of the maximum scour depth from the weir toe can reduce the risk of the weir overturning. In rectangular blocks, the maximum scour depth decreases, and its location is further from the weir toe. Also, as the densimetric Froude number increases, the flow rate rises and the tailwater decreases; the maximum scour depth also increases. The range of the densimetric Froude number in the present study varies between 0.43 and 0.55. Finally, dimensional analysis was used to generalize the results to nature and other models of piano key weirs.

کلیدواژه‌ها English

Output Keys
Scour Index
Rectangular
Type B
Different Block Geometry
[1]. Fathi, A., Khoshfetrat, A., Talebipour, F. and Saadat, M. Influence of rigid vegetation on flow energy dissipation downstream of type B trapezoidal piano key weirs. Innovative Infrastructure Solutions, 10(8) (2025) 1-15. https://doi.org/10.1007/s41062-025-02172-x.
[2]. Jüstrich, S., Pfister, M. & Schleiss, A.J. Mobile riverbed scouring downstream of a piano key weir. Journal of Hydraulic Engineering, 142(11) (2016) 04016043. https://doi.org/10.1061/ASCE HY.1943-7900.0001189.
[3]. Ghafouri, A., Ghodsian., M. & Abdi Chooplou, Ch. Experimental study on the effect of discharge and tailwater depth on bed topography downstream of a piano key weir. Journal of Hydraulics, 15(3) (2020) 107-122. https://doi.org/10.30482/JHYD.2020.236770.1465.
[4]. Dehrashid, F.A., Gohari., S., Asim., T., Mishra., R., Khoshkonesh., A., Bahamanpouri., F. & Nsom, B. Experimental and numerical study of local scouring downstream of D-type piano key weir. International Journal of COMADEM, 25(1) (2022) 51-62.
[5]. Abdi Chooplou, Ch., Ghodsian, M., Abediakbar, D., & Ghafouri, A. An experimental and numerical study on the flow field and scour downstream of rectangular piano key weirs with crest indentations. Innovative Infrastructure Solutions, 8(5) (2023) 140. https://doi.org/10.1007/s41062-023-01108-7.
[6]. Abdi Chooplou, C., Ghodsian, M. and Ghafouri, A. Local scour downstream of various shapes of piano key weirs. Innovative Infrastructure Solutions, 9(4) (2024) 117. https://doi.org/10.1007/s41062-024-01411-x.
[7]. Bodaghi, E., Ghodsian, M. and Abdi Chooplou, Ch. The experimental study of downstream scouring of trapezoidal Piano key weir type A under free and submerged flow. Journal of Hydraulics, Vol. 18, Issue 1 (2023). https://doi.org/10.30482/JHYD.2022.330389.1590.
[8]. Bodaghi E, Abdi Chooplou Ch, Ghodsian M. Experimental investigation of scour downstream of a type A trapezoidal piano key weir under free and submerged flow conditions. Journal of Hydrology and Hydromechanics., 71 (2024). https://doi.org/10.2478/johh-2023-0041.
[9]. Dehghan, M. and Karami, H. Numerical investigation of scour downstream of piano key Weirs using Flow-3D software. Amirkabir Journal of Civil Engineering, 56(2) (2024) 203-228. https://doi.org/10.22060/ceej.2024.22659.8019.
[10]. Gohari, S. & Ahmadi, F. Experimental study of downstream scour of piano keys weirs. Journal of Water and Soil Conservation, 26(1) (2019) 91-109. https://doi.org/10.22069/JWSC.2019.14680.2961.
[11]. Yazdi, A., Hosseini, S.A., Nazari, S. & Amanian, N. Comparison of downstream scour of the rectangular and trapezoidal piano key weirs. Journal of Hydraulics, 15(2) (2020) 95-112. https://doi.org/10.30482/JHYD.2020.227522.1453.
[12]. Yazdi, A.M., Hoseini, S., Nazari, S. and Fazeli, M. Numerical and experimental analysis of scour downstream of piano key weirs. Sādhanā, 47(4) (2022) 189. https://doi.org/10.1007/s12046-022-01960-w.
[13]. Ghodsian, M., Abdi Chooplou, Ch. & Ghafouri, A. Scouring of triangular and trapezoidal pianos key weir. Journal of Hydraulics, 16(2) (2021) 43-58. https://doi.org/10.30482/JHYD.2021.261439.1497.
[14]. Jamal, A.A.R., Tahaa, K.Y. and Hayawi, G.A.A.M. Experimental Study of Scour Downstream Piano Key Weir Type C with Changing Height of Weir Width of Keys and Apron Solid. Al-Rafidain Engineering Journal (AREJ), 27(1) (2022) 193-204. https://doi.org/10.33899/rengj.2021.130402.1101.
[15]. Lantz, W., Crookston, B.M. & Palermo, M. Apron and cutoff wall scour protection for piano key weirs. Water, 13(17) (2021) 2332. https://doi.org/10.3390/w13172332.
[16]. Kumar, B. & Ahmad, Z. Scour downstream of a piano key weir with and without a solid apron. Journal of Irrigation and Drainage Engineering, 148(1) (2022) 04021066. https://doi.org/10.1061/(ASCE)IR.1943-4774.0001647.
[17]. Rdhaiwi, A.Q., Khoshfetrat, A. and Fathi, A. Experimental investigation of scour downstream of a C-Type trapezoidal piano key weir with stilling basin. Journal of Engineering and Sustainable Development, 27(6) (2023) 688-697. https://doi.org/10.31272/jeasd.27.6.2.
[18]. Fathi, A., Abdi Chooplou, C. and Ghodsian, M. Local scour downstream of type-A trapezoidal stepped piano key weir in sand and gravel sediments. ISH Journal of Hydraulic Engineering, (2024) 1–13. https://doi.org/10.1080/09715010.2024.2353612.
[19]. Abdi Chooplou, C., Kahrizi, E., Fathi, A., Ghodsian, M. and Latifi, M. Baffle-Enhanced Scour Mitigation in Rectangular and Trapezoidal Piano Key Weirs: An Experimental and Machine Learning Investigation. Water, 16(15), (2024) 2133. https://doi.org/10.3390/w16152133.
[20]. Kazerooni, S., Abdi Chooplou, C. and Ghodsian, M. Effects of flow splitters on local scour downstream of type-A trapezoidal piano key weir. Applied Water Science, 14(12) (2024) 247. https://doi.org/10.1007/s13201-024-02309-w.
[21]. Fathi, A., Khoshfetrat, A. and Alavi, S.H. Downstream Local Scour of PKW with Different Shapes and Numbers of Flow Splitters. Journal of Hydraulic Engineering, 151(4) (2025) 04025015. https://doi.org/10.1061/JHEND8.HYENG-14143.
[22]. Mshali, K.C., Khoshfetrat, A. and Fathi, A. Experimental study of the effect of jump on the Downstream Scouring of type-C trapezoidal piano key weir. Amirkabir Journal of Civil Engineering, 56(11) (2024) 1353-1368. https://doi.org/10.22060/ceej.2024.22565.7996.
[23]. Babakhah, L. and Khoshfetrat, A. Investigating local scour downstream of Piano key weir with Riprap. Innovative Infrastructure Solutions, 9(11) (2024) 1-15. https://doi.org/10.1007/s41062-024-01759-0.
[24]. Panthi, M. A Laboratory Study of Local Scour and Driftwood Effects at a Type a Piano Key Weir. (2025). https://doi.org/10.26076/e209-99f7.
[25]. Rdhaiwi, A.Q., Khoshfetrat, A. and Fathi, A. Experimental comparison of flow energy loss in type-B and-C trapezoidal piano key weirs. Journal of Engineering and Sustainable Development, 28(1) (2024) 55-64. https://doi.org/10.31272/jeasd.28.1.4.
[26]. Fathi, A., Abdi Chooplou, Ch. and Ghodsian, M. An Experimental Study of Flow Energy Loss in Trapezoidal Stepped Piano Key Weirs (PKWs). Modares Civil Engineering journal, 23(4) (2023) 163-174. https://doi.org/10.22034/23.4.163.
[27]. Sumer, B.M. & Fredsoe, J. August. Onset of scour below a pipeline exposed to waves. In The First International Offshore and Polar Engineering Conference. OnePetro. (1991). https://doi.org/10.1115/OMAE2010-20719.
[28]. Novák, P. & Čabelka, J. Models in hydraulic engineering: Physical principles and design applications. Monographs & surveys in water resources engineering. (1981).
[29]. Singh, D. and Kumar, M. Gene expression programming for computing energy dissipation over type-B Piano Key Weir. Renewable Energy Focus, 41 (2022) 230-235. https://doi.org/10.1016/j.ref.2022.03.005.
[30]. Chiew, Y.M. Scour protection at bridge piers. Journal of Hydraulic Engineering, 118(9) (1992) 1260-1269.  https://doi.org/10.1061/ASCE0733-94291992118:91260.
نشریه مهندسی عمران امیرکبیر
دوره 57، شماره 12
اسفند 1404
صفحه 2013-2032