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شبیهسازی آبیاری نواری با دو الگوی حل عددی | ||
تحقیقات آب و خاک ایران | ||
مقاله 1، دوره 45، شماره 4، دی 1393، صفحه 369-378 اصل مقاله (592.78 K) | ||
نوع مقاله: مقاله پژوهشی | ||
شناسه دیجیتال (DOI): 10.22059/ijswr.2014.52589 | ||
نویسندگان | ||
محمدعلی غلامی سفیدکوهی1؛ علی کولائیان* 2 | ||
1استادیار گروه مهندسی آب دانشگاه علوم کشاورزی و منابع طبیعی ساری | ||
2دانشآموختة کارشناسی ارشد آبیاری و زهکشی دانشگاه علوم کشاورزی و منابع طبیعی ساری | ||
چکیده | ||
معادلات سنتـ ونانت از معادلات پایهای در رشتههای مختلف هیدرولیک، از جمله آبیاری سطحی است. در این تحقیق، با استفاده از روش تفاضل محدود و دو الگوی عددی لکس انتشاری (HD-LAX) و مککورومک (HD-MAC)، مدل هیدرودینامیک کامل جریان در آبیاری نواری حل شد. به منظور ارزیابی این دو الگو، نتایج شبیهسازی با شش سری دادههای اندازهگیریشده در شرایط متفاوت مقایسه شد. نمایههای ارزیابی نشان داد هر دو الگو از دقت مناسبی برای شبیهسازی فرایندهای مختلف جریان برخوردارند. نتایج نشان داد در یک نوار، با افزایش دبی ورودی، دقت پیشبینی هر دو الگو افزایش مییابد. افزایش طول و عرض و شیب نوارْ کاهش دقتِ پیشبینیِ هر دو الگوی عددی را به همراه خواهد داشت. یافتهها نشان میدهد الگوی HD-LAX با متوسط ضریب تبیین 9452/0 و 8366/0 بهترتیب در شبیهسازی مراحل پیشروی و پسروی و خطای نسبی 63/5- و 87/7 درصد در برآورد حجم آب نفوذیافته و رواناب نسبت به الگوی HD-MAC از دقت بالاتری برخوردار است. | ||
کلیدواژهها | ||
حل عددی؛ لکس؛ مک کورمک؛ هیدرودینامیک کامل | ||
عنوان مقاله [English] | ||
Simulation of Border Irrigation Using the two Numerical Schemes | ||
نویسندگان [English] | ||
Mohammad Ali Gholami Sefidkouhi1؛ Ali Koulaian2 | ||
1Assistant Professor, Water Engineering Department, University of Sari Agricultural Sciences and Natural Resources | ||
2M.S. Graduated from of Irrigation and Drainage, University of Sari Agricultural Sciences and Natural Resources | ||
چکیده [English] | ||
Saint-venant equations constitute some of the basic relations that play important roles in different hydraulic studies, including the ones in surface irrigation. Throughout the present study, full hydrodynamic model of the flow was solved using finite difference method and dispersive explicit Lax (HD-LAX) as well as MacCormack (HD-MAC) schemes. In order to evaluate these two schemes, output with six measured data series were compared under different conditions. The results revealed that within an irrigation border, the prediction accuracy in both schemes increased by increase in inflow. The simulation accuracy of both schemes decreased by increase in length, width and slope of the border. The findings indicate that HD-LAX scheme with respective 0.9452 and 0.8366 coefficients of determination within the advance and recession flow phases’ simulation, and with -5.63 and 7.87 percent of the relative error are of more accuracy (in infiltrated water volume and runoff estimation) as compared with HD-MAC scheme. | ||
کلیدواژهها [English] | ||
Numerical solution, Lax, MacCormack, Full Hydrodynamic | ||
مراجع | ||
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