بررسی اثر عمق نفوذ پلکان در محیط متخلخل بر تبادل جریان‌های سطحی و زیرسطحی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 آبیاری و آبادانی، پردیس کشاورزی دانشگاه تهران

2 گروه آبیاری و آبادانی، دانشکدگان کشاورزی و منابع طبیعی، دانشگاه تهران، کرج، ایران

3 گروه مهندسی آب، دانشکده مهندسی آب و خاک ، دانشگاه علوم کشاورزی و منابع طبیعی گرگان

4 استادیار، گروه مهندسی آبیاری و آبادانی، دانشکده مهندسی و فناوری کشاورزی، دانشگاه تهران، کرج، ایران.

چکیده

تبادل جریان‌های سطحی و زیرسطحی در بستر رودخانه‏ها در اثر شکل طبیعی رودخانه‏ و سازه‏های مختلف در مسیر جریان، بدلیل توجه روز افزون به محیط زیست در سالهای اخیر، مورد توجه محققین قرار گرفته است. از آنجایی که سازه‌های مسیر جریان نقش کنترل‌شده و اثرگذارتری نسبت به ریخت‌شناسی رودخانه‌ها در شکل‌گیری این تبادلات دارند، در این پژوهش تاثیر عمق نفوذ این سازه‌ها در بستر متخلخل بر خصوصیات جریان‌های تبادلی از طریق آزمایش و شبیه‌سازی عددی مورد بررسی قرار گرفته است. آزمایش‌ها در یک کانال آزمایشگاهی به طول 10 متر، عرض 20 سانتی‌متر، عمق 30 سانتی‌متر و شیب 01/0،  برای سه عمق نفوذ 9، 11 و 13 سانتی‌متر انجام و برای مسیریابی جریان از ردیاب پتاسیم پرمنگنات استفاده شد. همچنین برای بدست آوردن مشخصات جریان تبادلی و الگوی جریان تبادلی با روش ردیابی ذرات، توسط نرم‌ افزار Flow 3D شبیه‌سازی شد. نتایج نشان داد که در دامنه رینولدز 1020 تا 3450، افزایش عمق نفوذ سازه از 9 به 13 سانتی‌متر، موجب افزایش زمان ماند و کاهش نرخ تبادل می‌شود. افزایش دبی جریان موجب کاهش نرخ تبادل و افزایش زمان ماند می‌شود. بنابراین می‌توان بکارگیری پلکان با عمق نفوذ بیشتر را برای بدست آوردن زمان ماند بیشتر و پلکان با عمق نفوذ کم‌تر را برای بوجود آوردن نرخ تبادل بیش‌تر توصیه کرد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Investigation of the effect of step penetration depth in porous medium on the hyporheic fluxes

نویسندگان [English]

  • Mahla Tajari 1
  • Mohammad Hosein Omid 2
  • Amir Ahmad Dehghani 3
  • Arezoo Nazi Ghameshlou 4
1 irrigation department, university of Tehran
2 Depratment of Irrigation and Reclamation Engineering, University College of Agriculture and Natural Resources, University of Tehran, Karaj, Iran
3 Dep. of Water Engineering, Faculty of Water and Soil, Gorgan University of Agricultural Sciences and Natural Resources, Golestan.
4 Assistant Professor, Department of Irrigation and Reclamation Engineering, Faculty of Agricultural Engineering and Technology, University College of Agriculture and Natural Resources, University of Tehran, P. O. Box 4111, Karaj, 31587-77871, Iran.
چکیده [English]

From environmental aspects, the exchange of surface and subsurface flows in riverbeds due to river morphology and in stream structures is very important. The flow path structures especially control structures have a more effective role than the river morphology in the formation of these exchanges. In this study, the effect of penetration depth of such structures in the porous bed on the characteristics of exchange flows was investigated both experimentally and numerically. The experiments were performed in a flume with a length of 10 m, width of 20 cm, depth of 30 cm and a slope of 0.01, at three penetration depths of 9, 11 and 13 cm respectively. Potassium permanganate tracer was used for tracking the flow. In addition, to obtain the characteristics of the exchange flow; the mainstream and the exchange pattern were simulated by particle tracking method using Flow 3D software. The results showed that in the Reynolds range of 1020 to 3450, increasing the penetration depth of the structure from 9 to 13 cm, would increase the residence time but decreases the exchange rate. However, increasing the flow rate would decrease the exchange rate and increase the retention time. Accordingly, the use of a step with a higher penetration depth is recommended to create a longer residence time. However, a step with a smaller penetration depth may be used to produce a higher exchange rate. 

کلیدواژه‌ها [English]

  • Keywords: Hyporheic exchanges
  • in-stream structures
  • Flow 3D software
  • Particle tracking

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تحقیقات آب و خاک ایران
دوره 53، شماره 7
مهر 1401
صفحه 1563-1574

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