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تأثیر آرایش مختلف آبشکن ها بر تغییرات عمق آب در شرایط جریان متغیّر تدریجی | ||
تحقیقات آب و خاک ایران | ||
دوره 52، شماره 8، آبان 1400، صفحه 2001-2017 اصل مقاله (4.11 M) | ||
نوع مقاله: مقاله پژوهشی | ||
شناسه دیجیتال (DOI): 10.22059/ijswr.2021.319429.668903 | ||
نویسندگان | ||
شبنم مغیث پور1؛ صلاح کوچک زاده* 2 | ||
1گروه مهندسی آبیاری و آبادانی، دانشکده مهندسی و فناوری کشاورزی،دانشگاه تهران، کرج ایران | ||
2استاد، گروه مهندسی آبیاری و آبادانی دانشکده مهندسی و فناوری کشاورزی | ||
چکیده | ||
آبشکنها برای تأمین اهداف گوناگون در رودخانه احداث میشوند و پژوهشهای صورت گرفته بر بررسی عملکردشان در تأمین اهداف مورد نظر متمرکز میشوند. در حالی که احداث آبشکنها در آبراههها بر شرایط هیدرولیکی جریان از جمله عمق یا تراز سطح آب بالادست تأثیر جدی دارند و این موضوع همچنان نیازمند مطالعه است. در این پژوهش که با هدف بررسی نقش آبشکن بر تغییرات تراز سطح آب صورت گرفت، تعداد 18 آرایش مختلف از آبشکنها در دامنه دبی 12 تا 70 لیتر بر ثانیه و با ثبت عمق آب در طول و عرض کانال آزمون شد. آرایش آبشکنها شامل هشت آرایش یکطرفه و ده آرایش دو طرفه متقارن و نامتقارن است. نتایج بیانگر افزایش عمق آب در بالادست و کاهش آن در طول مشخصی از پاییندست میدان آبشکنها است. از آنجا که افزایش عمق یا تراز سطح آب بالادست سازه به نیروی کششی مربوط است، یک معادله غیر خطی برای برآورد ضریب این نیرو برای آبشکن منفرد ارائه شد. همچنین دادهها نشان داد که در همه آرایشها نرخ افزایش عمق آب بالادست، با افزایش دبی زیاد شده است. در حالی که طول تأثیر بر نیمرخ سطح آب پاییندست آبشکنها در آرایش دو طرفه تابع دبی است؛ اما در آرایش یکطرفه مستقل از آن است. همچنین تأثیر آرایش آبشکنها و شرایط جریان بر پروفیل عرضی سطح آب در عرض فلوم ارائه شده است. | ||
کلیدواژهها | ||
اصلاح مسیر رودخانه؛ برگشت آب؛ سازه عرضی؛ طول تأثیر؛ نیروی کششی | ||
عنوان مقاله [English] | ||
Effect of Various Spur Dikes Arrangement on Water Depth Changes in Gradually Varied Flow Condition | ||
نویسندگان [English] | ||
shabnam moghispour1؛ Salah Kouchakzadeh2 | ||
1Irrigation and Reclamation Engineering Department, Faculty of Agriculture Engineering and Technology, Tehran Universitiy, Karaj, Iran | ||
2Prof. Irrigation and Reclamation Engineering Dept. Faculty of Agriculture Engineering and Technology | ||
چکیده [English] | ||
River spur dikes are constructed for achieving different goals and researches are concentrated on investigation of their performances regarding the desired goals. While they show drastic impact on the flow hydraulic conditions in waterways including water surface elevation which still need further investigation and should be treated seriously. The objective of this study was to investigate the effect of spur dikes on water surface elevation variation. For this purpose, 18 different arrangements of spur dikes installation were experimentally studied. The tests were run for seven discharges in the range of 12 to 70 liters per second and by measuring and recording the longitudinal and transverse water depth along the channel. The spur dikes arrangement consists of eight unilateral arrangements and ten two-way symmetrical and asymmetrical arrangements. The results indicated that the water level increased in the upstream while it decreased at the downstream down to a specific length. The increment of the upstream water level was associated to the exerted drag force on the spur dike; accordingly, a nonlinear equation was proposed to estimate the drag coefficient of the single spur dike. The data also showed that the rate of upstream water level increment has increased by increasing flow discharge for all arrangements, while the length of the downstream, which is affected by the spur dikes, in two-way arrangement is depended on discharge while it is independed in one-way arrangement. The effect of spur dikes arrangement and flow conditions on the transverse water level has also been presented. | ||
کلیدواژهها [English] | ||
Affected length, Backwater, Drag force, River training, Transverse Structure | ||
مراجع | ||
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