برآورد پارامترهای مدل ذخیره موقت برای شبیه‌سازی انتقال آلودگی در رودخانه‌های بستر سنگریزه‌ای

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه مهندسی آب، دانشگاه علوم کشاورزی و منابع طبیعی ساری، ساری، ایران

2 گروه مهندسی آب، دانشگاه علوم کشاورزی و منابع طبیعی ساری،ساری، ایران.

3 دانشکده فنی و مهندسی، دانشگاه مراغه،مراغه، ایران،

4 دانشکده فنی و مهندسی،دانشگاه مراغه،مراغه، ایران.

چکیده

این تحقیق برای آزمون نحوه تبادل جرم مابین مجرای اصلی و مناطق راکد جریان در آبراهه‌های روباز انجام گرفت. معادلات دیفرانسیلی ذخیره-موقت به‌عنوان معادلات اساسی حاکم بر انتقال و پراکندگی آلودگی انتخاب شده و آزمایش‌های این پژوهش در یک فلوم آزمایشگاهی به طول، عرض و ارتفاع (12، 2/1 و 8/0) متر و بر روی یک بستر سنگریزه­ای انجام شد. شیب­های 001/0، 004/0 و 007/0 و دبی­های 5/7، 5/11 و 5/15 لیتربرثانیه برای انجام آزمایش‌ها انتخاب گردید. برای تخمین پارامترهای چهارگانه این معادلات، از مدل عددی OTIS-P استفاده شده و سپس منحنی­های رخنه مشاهداتی در نقاط مختلف اندازه­گیری باز تولید شدند. انطباق منحنی­های رخنه پیش‌بینی‌شده و اندازه­گیری شده توسط شاخص‌های جذر میانگین مربع خطاها، ضریب کارایی نش – ساتکلیف و متوسط خطای مطلق بررسی شد. حاصل تحقیق بیانگر دقت بالای مدل عددی OTIS-P با مقادیر RMSE بین 031/0 تا 118/0 و شاخص نش- ساتکلیف (Nash-Sutcliffe) بین 48/0 تا 97/0 در تخمین پارامترهای مدل ذخیره موقت می­باشد. در نهایت اعتبار پارامترهای برآورد شده مدل ذخیره موقت با استفاده از عدد بدون بعد دام-کلور تائید شد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Estimation of Transient Storage Parameters for Simulation of Pollution Transport in the Gravel Bed Rivers

نویسندگان [English]

  • yaghoub azhdan 1
  • Alireza Emadi 2
  • Jafar Chabokpour 3
  • Rasoul Daneshfaraz 4
1 Department of Water Engineering,Sari Agricultural Sciences and Natural Resources University,Sari, Iran.
2 Department of Water Engineering, Sari Agricultural Sciences and Natural Resources University,Sari, Iran.
3 Faculty of Engineering, Maragheh University,Maragheh, Iran,
4 Faculty of Engineering, Maragheh University, Maragheh, Iran.
چکیده [English]

This research was conducted to test how to exchange mass between the main channel and the stagnant areas of the stream. The transient storage differential equations were selected as the governing equations for simulation of advection- diffusion of pollution in river flow. The experiments were conducted in a gravel bed flume, with length, width and depth of 12, 1.2 and 0.8m, respectively. Three longitudinal slopes of 0.001, 0.004 and 0.007 and three discharges of 7.5, 11.5 and 15.5 (l/s) were selected for the experiments. The numerical model of OTIS-P was used to estimate the four parameters of the transient storage model. Then the observed breakthrough curves were regenerated at the same locations of measured points. Goodness of fit was estimated with the root mean square error (RMSE), Nash and Sutcliffe model efficiency coefficient (NS) and the mean absolute error (MAE). The comparisons revealed that the OTIS-P model (with RMSE between 0.031- 0.118 and Nash- Sutcliffe between 0.48-0.9) could be employed successfully for estimation transient storage parameters. Finally, the reliability of the estimated parameters of the transient storage model was confirmed by the non-dimensional Dam-kohler number.

کلیدواژه‌ها [English]

  • Tracer Experiment
  • Mass Exchange
  • breakthrough curve
  • OTIS-P

مراجع

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تحقیقات آب و خاک ایران
دوره 50، شماره 1
فروردین و اردیبهشت 1398
صفحه 65-76

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