بررسی تأثیر قرارگیری صفحات مستغرق در میزان رسوب‌شویی تحت‌فشار مخازن سدها

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه مهندسی آب، دانشکده کشاورزی، دانشگاه شهید باهنر کرمان، کرمان ، ایران

2 گروه مهندسی آب، دانشکده کشاورزی، دانشگاه شهید باهنر کرمان، کرمان ، ایران

3 موسسه تحقیقات پیشگیری از بلایا (DPRI)، دانشگاه کیوتو، کیوتو، ژاپن

چکیده

رسوب‌شویی تحت ‌فشار (فلاشینگ) یکی از راه‌حل‌های تخلیه رسوبات مخازن سدها است. در این مطالعه تأثیر قرارگیری صفحات مستغرق بر میزان عملکرد رسوب‌شویی تحت ‌فشار در مخازن مورد بررسی قرار گرفت. بدین منظور از صفحات مستغرق با آرایش‌های همگرا، واگرا و ترکیبی در سه فاصله صفحات تا دریچه تخلیه کننده تحتانی () و سه فاصله میانی بین صفحات () با سه ارتفاع‌ متفاوت () استفاده شد و نتایج با آزمایش بدون سازه مقایسه گردید. نتایج تحقیق نشان داد که استفاده از صفحات مستغرق با ایجاد جریان گردابی و تلاطم موجب تقویت عملکرد فلاشینگ شده و با تخلیه رسوبات بیشتری از زیر دریچه تخلیه کننده تحتانی، در تمامی آزمایش‌ها حجم چاله رسوب‌شویی را افزایش می‌دهد. به‌گونه‌ای‌که در آرایش‌های همگرا و واگرا به ترتیب افزایش 5/6 و 48 برابری حجم رسوبات تخلیه‌شده نسبت به آزمایش بدون سازه مشاهده گردید. همچنین در هنگام استفاده از صفحات ترکیبی دو ردیفه در آرایش واگرا با فواصل نسبی 5/0  ، 3/0  و ارتفاع نسبی 1  ، حجم چاله رسوب‌شویی به میزان 51 برابر نسبت به آزمایش شاهد افزایش یافت. در پایان با استفاده از روش همبستگی چند جمله‌ای، رابطه بین فواصل صفحات و مقدار رسوبات شسته شده به صورت یک معادله بدون بعد ارائه گردید.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Investigation of the Impacts of Submerged Vanes on Pressurized Flushing in Reservoirs

نویسندگان [English]

  • Sepideh Beiramipour 1
  • Kourosh Qaderi 2
  • Majid Rahimpour 2
  • Mohammad Mahdi Ahmadi 2
  • Sameh Ahmed Kantoush 3
1 Department of Water Engineering, Faculty of Agriculture, Shahid Bahonar University of Kerman, Kerman, Iran
2 Department of Water Engineering, Faculty of Agriculture, Shahid Bahonar University of Kerman, Kerman, Iran
3 Disaster Prevention Research Institute, Kyoto University, Kyoto. Japan
چکیده [English]

Pressurized flushing is one of the techniques for evacuating sediments from reservoirs. In this study, the impact of submerged vanes on performance of pressurized flushing were investigated. For this purpose, submerged vanes with convergent, divergent and combined arrangements in three distances from the bottom outlet (), three middle distances () and three heights above the sediment bed () were used and the results were compared with the non structural test (reference test). The results showed that the submerged vanes by creating rotational flow and turbulence, enhanced the performance of flushing and also by evacuating much sediment below the bottom outlet, the amount of evacuated sediments increased in all experiments. As, in the convergent and divergent arrangements, the volume of evacuated sediments increased respectively 6.5 and 48 times compared to the non structural test. Also, in the combined arrangement with two-row divergent of submerged vanes, in 0.5, 0.3 and 1, the volume of flushing cone increased 51 times compared to reference test. Finally, by using a polynomial correlation with vane spacing, a non-dimensional equation for estimating the scour cone volume was proposed.

کلیدواژه‌ها [English]

  • Hydraulic flushing
  • Submerged Vanes
  • Sediment flushing cone
  • Reservoirs
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