نوع مقاله : مقاله پژوهشی
نویسندگان
1 دانشجوی کارشناسی ارشد مهندسی عمران، دانشگاه آزاد اسلامی، واحد سپیدان، فارس، ایران
2 مربی، گروه مهندسی عمران، دانشگاه فنی و حرفه‌ای، تهران، ایران
3 استادیار، دانشکده مهندسی، دانشگاه آزاد اسلامی واحد سپیدان، فارس، ایران
چکیده
برآورد ضریب زبری منینگ از اهمیت و حساسیت بالایی برخوردار است. در مطالعه حاضر مسافت 56 کیلومتری از رودخانه بشار در استان کهگیلویه و بویراحمد مورد مطالعه قرار گرفت. دسترسی انتخاب شده بر اساس ویژگی های مشابه به 12 زیرشاخه تقسیم شد. برای برآورد ضریب منینگ از روشهای تجربی و شبه تجربی، جداول و روش کوان استفاده شد. نتایج تخمین با منحنی‌های رتبه‌بندی دبی مرحله‌ای از دو ایستگاه هیدرومتری واقع در محدوده انتخاب‌شده مقایسه شد. "راه حل معکوس" به عنوان بهترین روش برای تخمین ضریب منینگ در رودخانه تحت مطالعه و به دنبال روش بروشین و کوان با میانگین خطای 0.237 و 0.241 به ترتیب ثابت شد.
کلیدواژه‌ها
عنوان مقاله [English]
A Study of Calculation Manning Roughness Methods: The Case of a Small River in Southwestern Iran
نویسندگان [English]
- S.Mohamad Sadegh Rasooli 1
- Amirhossein Bazaee 2
- Roozbeh Aghamajidi 3
1 Master's student in Civil Engineering, Islamic Azad University, Sepidan Branch, Fars, Iran
2 Instructor, Department of Civil Engineering, Faculty of Engineering, Technical and Vocational University (TVU), Tehran, Iran
3 Assistant Professor, Faculty of Engineering, Islamic Azad University, Sepidan Unit, Fars, Iran
چکیده [English]
Affected by numerous elements, the estimation of manning's roughness coefficient is of great importance and sensitivity. In the present study a reach of 56 km from beshar river in kohgiluyeh and boyer-ahmad province was studied. The selected reach was divided into 12 sub-reaches based on similar characteristics. Experimental and quasi-experimental methods, tables, and cowan's method were used to estimate manning's coefficient. The estimation results were compared with stage-discharge rating curves from two hydrometric stations located in the selected reach. The ‘inverse solution’ was proved to be the best method to estimate manning's coefficient in the river under study followed by bruschin and cowan's method with an average error of 0.237 and 0.241, respectively.
کلیدواژه‌ها [English]
- Manning's coefficient
- Inverse solution method
- Beshar river
- HEC-RAS
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