تخمین آبشستگی در مجاورت پایه‌های پل جفت و سه تایی با استفاده از دسته بندی c-میانیگن فازی شبکه انفیس

نویسندگان

1 دانشجوی دکتری منابع آب، گروه مهندسی آب، واحد کرمانشاه، دانشگاه آزاد اسلامی، کرمانشاه، ایران

2 گروه مهندسی آب- دانشگاه آزاد واحد کرمانشاه

3 استادیار گروه مهندسی آب، واحد کرمانشاه، دانشگاه آزاد اسلامی، کرمانشاه، ایران

چکیده

تخمین و پیش‌بینی آبشستگی در اطراف پایه پل‌ها نقش بسزایی در طراحی این نوع از سازه‌ها ایفا می‌کند زیرا با افزایش ابعاد حفره آبشستگی پایداری پایه پل به خطر افتاده و در نتیجه این سازه ممکن است تخریب شود. در این مطالعه، عمق آبشستگی در مجاورت پایه پل‌های جفت و سه تایی با استفاده از تکنیک دسته بندی c- میانیگن فازی شبکه انفیس (ANFIS-FCM) تخمین زده شد. برای انجام این کار، ابتدا پارامترهای تاثیرگذار بر روی عمق آبشستگی در اطراف پایه‌های پل جفت و سه تایی از قبیل عدد فرود (Fr)، نسبت نسبت قطر پایه پل به عمق جریان (D/h) و نسبت فاصله بین پایه‌ها به عمق جریان (d/h) شناسایی شدند. سپس با استفاده از این پارامترهای بدون بعد، هفت مدل ANFIS-FCM مختلف تعریف گردید. لازم به ذکر است که برای آموزش این مدل‌ها از 70 درصد داده‌های آزمایشگاهی و برای آزمون آنها از 30 درصد باقیمانده استفاده شد. در ادامه، با انجام یک تحلیل حساسیت، مدل برتر و موثرترین پارامتر ورودی معرفی شدند. مدل برتر مقادیر آبشستگی‌ها را بر حسب کلیه پارامترهای ورودی با دقت مناسبی پیش‌بینی نمود. به‌عنوان مثال، مقادیر ضریب همبستگی، شاخص پراکندگی و ضریب نش برای شرایط آزمون مدل برتر به‌ترتیب مساوی با 988/0، 106/0 و 976/0 بدست آمدند. علاوه بر این، عدد فرود نیز مهمترین پارامتر ورودی در نظر گرفته شد. در انتها، یک کد کامپیوتری برای شبیه‌سازی عمق حفره آبشستگی در مجاورت پایه‌های پل جفت و سه تایی ارائه گردید.

کلیدواژه‌ها

عنوان مقاله [English]

Estimation of scour around twins and three piles using fuzzy c-means clustering of ANFIS Network

نویسندگان [English]

  • afshin kiani 1
  • saeid shabanlou 2
  • fariborz yosefvand 3
1 Ph.D. Candidate, Department of Water Engineering, Kermanshah Branch, Islamic Azad University, Kermanshah, Iran
2 Water Engineering Department, Kermanshah Branch, Islamic Azad University, Kermanshah
3 Department of Water Engineering, Kermanshah Branch, Islamic Azad University, Kermanshah, Iran
چکیده [English]

Estimation and prediction of scouring around the piers play a significant role to design these structures since with increasing dimensions of scour hole, stability of the pier is threatened; as a result, the structure may be destructed. In this study, scour hole in the vicinity of twin and three piers is estimated by using fuzzy c-means clustering of ANFIS (ANFIS-FCM) network technique. To do this, firstly, the parameters affecting scour hole around twin and three piers including Froude number (Fr), the ratio of the pier diameter to the flow depth (D/h), and the ratio of the distance between the piers to the flow depth (d/h) were detected. Subsequently, seven ANFIS-FCM models were defined by means of these dimensional input parameters. It should be stated that 70% of the experimental data were utilized to training the models and 30% of the rest were applied to testing. Next, the superior ANFIS-FCM model and the most important input parameter were introduced by implementing a sensitivity analysis. The premium model as a function of all input parameters simulated the scour values with a reasonable accuracy. For instance, the correlation coefficient (R), the scatter index (SI), and the Nash-Sutcliff efficiency coefficient (NSC) are respectively computed to be 0.988, 0.106, and 0.976. Furthermore, the Froude number was considered as the most important input parameter. Lastly, a computer code was introduced so as to simulate the scour hole around the twin and three piers.

کلیدواژه‌ها [English]

  • Fuzzy c-means clustering
  • ANFIS
  • Scouring
  • Piers
  • Sensitivity analysis

مراجع

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دانش آب و خاک
دوره 34، شماره 1
فروردین 1403
صفحه 133-148

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