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تعیین میزان اهمیت ضریب پراکندگی طولی در انتقال آلاینده در رودخانهها با استفاده از شبیهسازی مونت کارلو | ||
| تحقیقات آب و خاک ایران | ||
| مقاله 1، دوره 50، شماره 4، شهریور 1398، صفحه 763-776 اصل مقاله (1.02 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22059/ijswr.2018.259654.667934 | ||
| نویسندگان | ||
| الهام کرمی چمه؛ مهدی مظاهری* | ||
| گروه سازه های آبی، دانشکده کشاورزی، دانشگاه تربیت مدرس، تهران، ایران | ||
| چکیده | ||
| پارامترهای مختلفی وجود دارد که برای تعیین ضریب پراکندگی در رودخانهها مهم است، به عنوان مثال پارامترهای هیدرودینامیکی و هندسه رودخانه. بنابراین تعیین دقیق این ضریب کار دشواری است. فرمولهای تجربی مختلفی برای تخمین ضریب پراکندگی در رودخانهها وجود دارد. این فرمولها عمدتاً در دامنه شرایطی که اعتبار آن‌ها اعلام شده است، دقیق هستند. دانستن شرایطی که تحت آن ضریب پراکندگی در رودخانهها تأثیر زیادی دارد، بسیار حائز اهمیت است. بنابراین در این شرایط باید آن را با دقت بیشتری تعیین کرد. هدف اصلی از این مطالعه ارائه یک روش جدید برای تعیین موقعیتهایی است که در آن، ضریب پراکندگی تأثیر معنیداری بر حمل و نقل مواد آلاینده دارد. روش پیشنهادی مبتنی بر روش شبیهسازی مونت کارلو است. این روش با استفاده از چندین مورد فرضی و همچنین یک مورد واقعی، صحتسنجی و اعتبارسنجی شده است. نتایج نشان میدهد که الگوی زمانی منبع آلودگی، عامل اصلی در تأثیر ضریب پراکندگی در حمل و نقل مواد آلاینده است. یافته اصلی تحقیق این است که گاهی اوقات میتوان ضریب پراکندگی را با خطاهای بزرگ در نظر گرفت و هیچ تغییر مهمی در نتایج شبیهسازی حمل و نقل مواد آلاینده رخ ندهد. | ||
| کلیدواژه‌ها | ||
| آنالیز حساسیت؛ آنالیز عدم قطعیت؛ معادله جابه‌جایی-پراکندگی | ||
| عنوان مقاله [English] | ||
| Determine of The Importance of Longitude Dispersion Coefficient on Solute Transport in Rivers Using the Monte Carlo Simulation | ||
| نویسندگان [English] | ||
| Elham Karami cheme؛ Mehdi Mazaheri | ||
| Department of Water Structures, Faculty of Agriculture, Tarbiat Modares University, Tehran, Iran | ||
| چکیده [English] | ||
| There are various parameters which are important in determining the dispersion coefficient in rivers, e.g. hydrodynamic parameters and river geometry. Thus it is a challenging task to determine this coefficient accurately. There are different empirical formulas to estimate the dispersion coefficient in rivers. These formulas are mostly accurate in the range of conditions they validated. It is important to know the conditions in which the dispersion coefficient effect is significant in rivers. Thus, in this conditions, one should determine it with more accuracy. The main purpose of this study is to present a new method for determining the situations in which, dispersion coefficient has significant effect on solute transport mechanism. The proposed method is based on the Monte Carlo simulation method. The method was verified and validated using several hypothetical and also a real test cases. The results show that the time pattern of pollution source is a key factor in the dispersion coefficient effects on solute transport mechanism. The main finding of the study is that, sometimes it is possible to consider the dispersion coefficient with large errors and no significant changes occur in results of the solute transport simulation. | ||
| کلیدواژه‌ها [English] | ||
| Sensitivity analysis, Uncertainty analysis, Advection-Dispersion Equation | ||
| مراجع | ||
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