ارزیابی خطای برآورد در تعدادی از مدل‌های توزیع اندازه ذرات برای توصیف دانه‌بندی رسوبات آبی

نویسنده

استادیار دانشگاه ارومیه

چکیده

توزیع اندازه ذرات رسوب از فاکتورهای کلیدی رسوب محسوب شده و بسیاری از ویژگی­های مربوط به رسوبات از جمله ویژگی­های هیدرولیکی و الکتریکی و ویژگی­های مرتبط با فرسایش و قابلیت انتقال آنها را تحت تأثیر قرار می­دهد. هدف از این مطالعه مقایسه­ی تحلیلی خطای برآورد در تعدادی از مدل­های ریاضی توزیع اندازه ذرات در توصیف رسوبات انباشته شده در پشت بندهای رسوبگیر متوالی بود. برای این منظور 20 نمونه رسوب از چهار آبراهه­ی فصلی در مناطق نوشان و انبی ارومیه تهیه شده و توزیع اندازه ذرات آن­ها به روش هیدرومتری تعیین شد. به منظور بررسی کارایی مدل­ها از ضرایب کارایی با ماهیت متفاوت استفاده شد. خوشه­بندی سلسله مراتبی مدل­ها براساس منتخب نشان داد که 6 مدل ویبول، فردلاند، ویبول اصلاح شده،ون­گنوختن، ONL و ORL نسبت به سایر مدل­ها کارایی بهتری داشتند. در بین این مدل­ها نیز مدل ویبول دارای برتری نسبی در مقایسه با سایرین بود. کارایی مدل­های برگزیده از نظر ضریب تبیین با افزایش درصد شن (ماسه) در نمونه­های رسوب افزایش یافت. خطای نسبی مدل­ها در دامنه­ی ذرات با قطر 2-005/0 میلیمتر کم بوده و مدل­ها توانایی مطلوبی در پیش­بینی مقدار شن (ماسه) در نمونه­های رسوب داشتند.

کلیدواژه‌ها

عنوان مقاله [English]

Evaluation of Prediction Error in Some Particle Size Distribution Models for River Sediments

نویسنده [English]

  • F. Asadzadeh
Assistant Professor, Urmia University
چکیده [English]

Particle size distribution is a paramount factor in characterization of sediments and may affect many of its properties such as hydraulic and electrical properties and characteristics related to the transportability by erosive agents. The aim of this study was to compare the capability of some mathematical models in describing particle size distribution of sediments trapped behind check-dams. Twenty sediment samples were taken from check-dams of four seasonal waterways in Anbi and Noshan regions of Urmia, Northwestern Iran. Full particle size distribution of sediments samples were determined by hydrometer method. Different aspects of models performance were evaluated by some efficiency criteria. Hierarchical cluster analysis of models based on selected efficiency criteria indicated that the Weibull, Revised-Weibull, Fredlund, van Genuchten, ORL and ONL are the best models in describing sediment particle size distribution. Among the selected models, Weibull was slightly superior with a mean coefficient of determination of 0.986. Efficiency of selected models, based on R2 value, improved with the increasing of sand content in the sediment samples. Relative error of the selected models was the lowest for particles with 0.005-2 mm in diameter, indicating the high performance of models to predict sand content of sediment samples.  

کلیدواژه‌ها [English]

  • Check-dam
  • Mathematical models
  • Models efficiency
  • Weibull model

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پژوهش های خاک
دوره 31، شماره 4
اسفند 1396
صفحه 587-599

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