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بررسی آزمایشگاهی هیدرولیک جریان در سرریزهای پلهای توریسنگی | ||
| نشریه مهندسی عمران امیرکبیر | ||
| مقاله 1، دوره 53، شماره 8، آبان 1400، صفحه 3169-3186 اصل مقاله (2.12 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22060/ceej.2020.17256.6502 | ||
| نویسندگان | ||
| فرزین سلماسی* 1؛ سینا رازی2؛ علی حسین زاده دلیر3 | ||
| 1Tabriz University, Agricultural faculty, Irrigation department | ||
| 2دانشجوی دکتری، گروه علوم و مهندسی آب، دانشگاه تبریز | ||
| 3گروه مهندسی آب، دانشگاه تبریز | ||
| چکیده | ||
| در این تحقیق با استفاده از مدل فیزیکی، مؤلفههای مختلفی که بر روی اُفت انرژی جریان عبوری از روی سرریزهای پلهای توریسنگی مؤثر هستند، مطالعه و با نتایج دیگر محققان نیز مقایسه صورت گرفته است. جریان عبوری از سرریز توریسنگی هم به صورت درونگذر و هم به صورت روگذر انجام گرفت. دامنه دبی بکار رفته در این تحقیق در محدوده 5 الی 65 لیتر بر ثانیه است. از ذرات یکنواخت با سه قطر متوسط 10، 25 و 40 میلیمتر استفاده شد. ارتفاع و عرض مدلهای فیزیکی ساخته شده از سرریز پلکانی توریسنگی به ترتیب 60 و 40 سانتیمتر، با پلههای 3 تایی و شیبنمای پاییندست سرریزها (افقی: عمودی) 1:1، 1:2 و 1:3 هستند. آستانههای انتهایی به کار گرفته شده مستطیلی و شیبدار هستند. نتایج نشان داد که تأثیر آستانهها در سرریزهای پلهای توریسنگی با شیبنمای پاییندست کمتر، بیشتر از حالتی است که سرریز دارای شیبنمای پاییندست تندتر است. تأثیر آستانهها بر اُفت انرژی جریان در سرریز با مصالح 40 میلیمتر و شیبنمای پاییندست 1:2 حدود 10 درصد بیشتر از همان سرریز با شیبنمای پاییندست 1:1 بوده و در سرریز با مصالح 10 میلیمتر و شیبنمای پاییندست 1:2 حدود 30 الی 35 درصد بیشتر از همان سرریز با شیبنمای پاییندست 1:1 است. لذا وجود آستانهها در سرریز پلهای با بدنه مصالح 10 و 40 میلیمتر به ترتیب بیشترین و کمترین تأثیر را بر اُفت انرژی جریان دارند. از طرفی تأثیر آستانه مستطیلی بر اُفت انرژی جریان حدود 3 الی 4 درصد بیشتر از تأثیر آستانه مثلثی است. | ||
| کلیدواژه‌ها | ||
| توریسنگی؛ سرریز پلهای؛ آستانه مستطیلی؛ آستانه شیبدار؛ افت انرژی | ||
| موضوعات | ||
| سازه های هیدرولیکی | ||
| عنوان مقاله [English] | ||
| Laboratory Study of the Hydraulics of Flow in Gabion Stepped Weirs | ||
| نویسندگان [English] | ||
| Farzin Salmasi1؛ Sina Razi2؛ Ali Hossinzadeh Dalir3 | ||
| 2PhD candidate, University of Tabriz, Tabriz-Iran | ||
| 3Professor, Water engineering department, University of Tabriz, Tabriz-Iran | ||
| چکیده [English] | ||
| In this study, different components that affect energy dissipation on flow over gabion-stepped spillways were investigated using physical models, and comparisons were made with the other studies. Flow over gabion spillway was conducted in both through flow and overflow simultaneously. The discharge is in the range of 5 to 65 liters per second. Uniform particles with three medium diameters of 10, 25, and 40 mm were used. The height and width of the physical models were 60 and 40 cm, respectively, with 3 steps and the downstream slope of weirs was 1:1, 1:2, and 1:3 (V: H). Tow end sills including rectangular and inclined shapes were used. The results showed that the effect of end sills in gabion-stepped weirs with lower slope is more than that of weirs comprising higher slope. The effect of the end sills on the energy dissipation in the weir for d50=40 mm and S=1:2 is about 10% more than the weir with d50=10 mm and S=1:1. In weir including d50=10 mm and S=1:2 is about 30 to 35 percent more than the weir with d50=10 mm and S=1:1. Therefore, the existence of end sills in the weirs with the body of materials of d50=10 and 40 mm have the highest and the least effects on the energy dissipation. On the other hand, the effect of the rectangular end sill on the energy loss is about 3-4% more than that the effect of the triangular end sill. | ||
| کلیدواژه‌ها [English] | ||
| Energy loss, Gabion, Inclined end sill, Rectangular end sill, Stepped weir | ||
| مراجع | ||
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