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بررسی اثر عمق نسبی بر مشخصات جریان در کانال مرکب پیچانرودی | ||
| تحقیقات آب و خاک ایران | ||
| دوره 51، شماره 8، آبان 1399، صفحه 2111-2124 اصل مقاله (1.99 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22059/ijswr.2020.300152.668569 | ||
| نویسندگان | ||
| حامد شهسواری1؛ سعید رضا خداشناس* 2؛ کاظم اسماعیلی3 | ||
| 1گروه مهندسی آب، دانشگاه فردوسی مشهد، مشهد- ایران | ||
| 2گروه مهندسی آب- دانشگاه فردوسی مشهد- مشهد- ایران | ||
| 3گروه علوم و مهندسی آب، دانشگاه فردوسی مشهد، مشهد، ایران | ||
| چکیده | ||
| ﯾﮑﯽ از ﺟﻨﺒﻪﻫﺎی ﻣﻬﻢ در توصیف رﻓﺘﺎر رودﺧﺎﻧﻪ، مارپیچی بودن آن ﻣﯽﺑﺎﺷﺪ. ﺗﻮﻟﯿﺪ ﺧﻢﻫﺎی ﻣﺘﻮاﻟﯽ در رودﺧﺎﻧﻪﻫﺎی ﻃﺒﯿﻌﯽ ﯾﮏ ﻣﻮﻟﻔﻪ اﺟﺘﻨﺎبﻧﺎﭘﺬﯾﺮ از ﻓﺮاﯾﻨﺪی اﺳﺖ ﮐﻪ رودﺧﺎﻧﻪ ﻃﯽ آن دچار دگرگونی ﻣﯽشود. آﮔﺎﻫﯽ از ﻫﯿﺪروﻟﯿﮏ ﺟﺮﯾﺎن در اندرکنش کانال اصلی و سیلابدشت بهخصوص در زمان سیلاب ﺑﺮای ﺣﻔﺎﻇﺖ خاک بستر و ﻧﯿﺰ ﺳﺎزهﻫﺎ و تاسیسات موجود ﻻزم و ﺿﺮوری اﺳﺖ. این تحقیق، برای شناخت بهتر هیدرودینامیک جریان متوسط و آشفته در کانالهای مرکب مارپیچ انجام شد. با توجه به شرایط طبیعی اکثر رودخانهها، بهدلیل متغیر بودن دبی و نسبتهای عمقی متفاوت (عمق جریان در سیلابدشت به عمق جریان در کانال اصلی)، در این پژوهش فلوم آزمایشگاهی مستطیلی پیچانرودی با سینوسیتی ثابت 3/1 برای نسبتهای عمقی متفاوت 35/0 و 55/0 بررسی شد. نتایج نشان داد که اندازه اجزاء مختلف سرعت در هر سه راستای مختصات در عمق نسبی 35/0 بیشتر از 55/0 است که نشان از قدرت بیشتر گردابها و شدت اندرکنش بین کانال اصلی و سیلابدشت در عمق نسبی کمتر را داشت. همچنین با بررسی جریانهای ثانویه، وجود گردابهای چرخشی ساعتگرد و پادساعتگرد در کانال اصلی و سیلابدشتها و موقیعت ایجاد این جریانات تعیین شد. | ||
| کلیدواژه‌ها | ||
| آبراهه مئاندری؛ ضریب پیچانی؛ عمق نسبی؛ الگوی جریان؛ سیلاب | ||
| عنوان مقاله [English] | ||
| Investigation of Relative Depth Effect on Flow Characteristics in Meandering Compound Channel | ||
| نویسندگان [English] | ||
| hamed shahsavari1؛ Saeed Reza Khodashenas2؛ Kazem Esmaili3 | ||
| 1Water Engineering Department, Ferdowsi University of Mashhad, Mashhad, Iran | ||
| 2Water Engineering Department, Ferdowsi University of Mashhad, Mashhad, Iran | ||
| 3Water Engineering Department, Ferdowsi University of Mashhad, , Mashhad, Iran | ||
| چکیده [English] | ||
| One of the important aspects in describing river behavior is its curvature. The production of successive bends in natural rivers is an inevitable component of the process through which the river changes. Understanding the flow behavior in the interaction between the main channel and the floodplain, especially during floods, is necessary to protect soil and water structures. This study was conducted to better understand the hydrodynamics of the middle and turbulent flow in compound meandering channels. According to the natural conditions of most rivers, due to variation of discharge and depth ratios (flow depth in floodplain to flow depth in the main channel), in this study, a rectangular meander laboratory channel with a constant sinuosity 1.3 for different depth ratios of 0.35 and 0.55 was investigated. The results showed that the size of velocity components (u,v,w) at 0.35 relative depth was greater than 0.55, which indicating higher vortex strength and interaction intensity between the main channel and floodplain at lower relative depth. Also, by investigating the secondary flows, the existence of clockwise and counterclockwise rotational eddy currents in the main channel and floodplains and the location of these currents were determined. | ||
| کلیدواژه‌ها [English] | ||
| Curve Coefficient, Flood, Flow Pattern, Meander Waterway, Relative Depth | ||
| مراجع | ||
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