بررسی تأثیر موانع گابیونی شکل بر رسوبات عبوری

نوع مقاله : مقاله کامل پژوهشی

نویسندگان

1 گروه مهندسی عمران، واحد نجف‌آباد، دانشگاه آزاد اسلامی، نجف آباد

2 گروه سازه‌های آبی، دانشکده مهندسی آب و محیط‌زیست، دانشگاه شهید چمران اهواز

3 گروه مهندسی آب، دانشکده کشاورزی، دانشگاه صنعتی اصفهان و گروه مهندسی عمران، واحد نجف آباد، دانشگاه آزاد اسلامی، نجف آباد

چکیده

رسوب­گذاری در مخازن به­ عنوان مهم­ترین عامل در کاهش عمر مفید سدهای بزرگ شناخته می­شود. براساس مطالعات مشخص شد که عامل اصلی در جابه­ جایی رسوبات جریان­ های غلیظ بوده، بر این اساس محققین در سال­ های اخیر راهکارهای گوناگونی برای کنترل این جریان­ ها ارائه نمودند که استفاده از موانع به­ عنوان یکی از مؤثرترین راهکارها شناخته می­شود. با درک دقیق عملکرد این جریان­ ها و عوامل مؤثر بر آن­ها می­توان گامی مؤثر در جهت کنترل یا حذف آن­ها برداشت. بر این اساس در این تحقیق به بررسی اثر تغییرات ارتفاع مانع گابیونی (Gabion) با قطر 7/0 سانتی­متر تحت تأثیر پارامترهای مختلف پرداخته شده است. به این صورت که تغییرات ارتفاع مانع (1، 5/1 و 2 برابر بدنه جریان غلیظ)، دبی (1، 5/1 و 2 لیتر برثانیه)، غلظت (10 و 15 گرم بر لیتر)، شیب (5/1، 2 و 5/2 درصد) موردبررسی قرار گرفت. نتایج بیانگر این مورد بود که سه پارامتر شیب کف فلوم (Flume Slope)، غلظت و دبی ورودی موردبررسی در این تحقیق از عوامل مؤثر بر مومنتم (Momentum) جریان بوده و با افزایش هر یک از این پارامترها، میزان عملکرد موانع با نسبت بی­بعد ارتفاع 1 و 5/1 کاهش پیدا می­کند اما در مانع با نسبت بی­بعد ارتفاع 2 عملکرد مانع بهتر شده، به­ گونه­ای که هنگام برخورد جریان با مانع اغتشاش زیاد ایجاد شده که سبب کاهش چشمگیر هد جریان غلیظ می­گردد، به این صورت که نرخ متوسط کاهش فلاکس هد (Head Flux) برای موانع با نسبت ارتفاع 1، 5/1 و 2 به­ترتیب 32، 45 و 92 درصد می­باشد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Experimental Investigation of the Effect of Gabion-Shaped Obstacles on Sedimentation

نویسندگان [English]

  • Mehdi Derakhshannia 1
  • Mehdi Ghomshi 2
  • Saeid Eslamian 3
  • S. Mahmod Kashefipour 2
1 Department of Civil Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran
2 Department of Water Structures, Faculty of Water and Environmental Engineering, Shahid Chamran University of Ahvaz, Ahvaz, Iran
3 Department of Civil Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran and Department of Water Engineering, College of Agriculture, Isfahan University of Technology, Isfahan, Iran
چکیده [English]

The researchers tried to build gabion barriers by considering the materials around the dam. In this study, gabion barriers with applicability were used, in which trapezoidal barriers were made using metal mesh and these barriers were filled with sand grains with an average size of 0.5 cm. The reason for using these dimensions of aggregate was the presence of stones with dimensions of 0.5 meters in nature, and if the laboratory results are suitable, it is possible to use them in the implementation, while proper slope. According to the executive criteria, it was considered to build the sides of the barrier in order to evaluate the possibility of falling aggregates. In this design, an attempt has been made to investigate the effect of gabion barriers on the percentage reduction of flow head flow. To better understand their efficiency in different conditions, some important parameters such as concentration, inlet discharge, slope and height of barriers have been considered.

کلیدواژه‌ها [English]

  • Density currents
  • Gabion Obstacles
  • Head Flux
  • Momentum
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