تحلیل آزمایشگاهی رفتار شیب شکن های مایل گابیونی در مقایسه با حوضچه‌‌‌‌های آرامش استاندارد (USBR)

نوع مقاله : مقاله پژوهشی

نویسندگان

1 استاد گروه مهندسی عمران، دانشکده فنی و مهندسی، دانشگاه مراغه

2 استادیار، گروه مهندسی عمران، دانشکده فنی و مهندسی، دانشگاه مراغه، مراغه، ایران

3 دانشجوی کارشناسی ارشد عمران آب و سازه های هیدرولیکی، گروه مهندسی عمران، دانشکده فنی و مهندسی، دانشگاه مراغه، مراغه، ایران

چکیده

کنترل مقادیر انرژی نسبی باقی‌مانده، عمق نسبی و عدد فرود پایین‌دست، جزو مسائل مهمی هستند که طراحان سازه‌های شیب‌شکن مایل با آن مواجه هستند. در این تحقیق 60 آزمایش متفاوت شامل سه زاویه و دو ارتفاع شیب‌شکن با جریان زیر بحرانی در بالادست با هدف بررسی تاثیر بکارگیری سازه گابیونی در سازه شیب‌شکن مایل در مقایسه با استفاده از حوضچه آرامش در پایین دست این سازه انجام شد. نتایج نشان داد برای تمامی مدل‌های تحقیق حاضر، افزایش عمق بحرانی نسبی سبب افزایش مقادیر انرژی نسبی باقی‌مانده و عمق نسبی پایین‌دست می‌گردد. مقادیر انرژی نسبی باقی‌‌مانده و عمق نسبی پایین‌دست، هنگام بکارگیری سازه گابیونی در ساختمان شیب‌شکن مایل و ایجاد شیب‌شکن مایل گابیونی با کاهشی چشمگیر همراه بود. شیب‌شکن مایل گابیونی به ترتیب باعث کاهش 30، 33، 30 و 36 درصدی انرژی نسبی باقی‌مانده پایین‌دست در مقایسه با حوضچه آرامش نوع یک، دو، سه و چهار گردید. استفاده از شیب‌شکن مایل گابیونی در مقایسه با حوضچه‌های آرامش استاندارد نوع یک، دو، سه و چهار به ترتیب باعث کاهش 37، 40، 37 و 43 درصدی مقادیر متوسط عمق نسبی پایین‌‌دست شد و عدد فرود از بازه 49/4 الی 35/8 به بازه 28/1 الی 64/2 کاهش یافت. همچنین روابطی جهت تخمین انرژی نسبی باقی‌مانده و عمق نسبی پایین‌دست شیب‌شکن مایل گابیونی ارائه شد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Experimental Analysis of Inclined Gabion Drop Behavior in Comparison to the Standard Stilling Basins (USBR)

نویسندگان [English]

  • Rasoul Daneshfaraz 1
  • Mahdi Majedi Asl 2
  • Mohammad Bagherzadeh 3
1 Professor, Department of Civil Engineering, Faculty of Engineering, University of Maragheh, Iran.
2 Assistant Professor, Department of Civil Engineering, Faculty of Engineering, University of Maragheh, Maragheh, Iran.
3 M.Sc. in Civil Engineering-Hydraulic Structures, Department of Civil Engineering, Faculty of Engineering, University of Maragheh, Maragheh, Iran
چکیده [English]

Controlling relative residual energy values, relative depth, and downstream Froude numbers are important issues faced by designers of inclined drop structures. In this study, 60 different experiments including three angles and two drop heights with subcritical flow at upstream were performed to investigate the effect of using gabion structure in inclined structure in comparison with using the stilling basin downstream of this structure. The results showed that for all experiments, increasing the relative critical depth increases the relative residual energy values and downstream relative depth. Relative energy values and relative downstream depth were significantly reduced when the gabion structure was used in inclined drop and the inclined gabion drop was constructed. The inclined gabion drop reduced the relative energy remained at downstream by 30, 33, 30, and 36 percent as compared to the standard type one, two, three and four stilling ponds, respectively. The average relative depth of downstream was also reduced 37, 40, 37 and 43% as compared to the standard type one, two, three and four stilling ponds, respectively. The range of Froude numbers reduced from 4.49-8.35 to 1.28-2.64. Also, some relationships were presented for estimating relative residual energy and relative depth at downstream of the gabion inclined drop structure.

کلیدواژه‌ها [English]

  • Residual Energy
  • Gabion structure
  • stilling basin
  • Additional structures
  • Relative Critical Depth
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