تحلیل خصوصیات باد در شب و روز و تأثیر آن بر عملکرد سیستم‌های آبیاری بارانی

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانش‌آموخته مقطع کارشناسی ارشد گروه مهندسی آب، دانشکده کشاورزی، دانشگاه تبریز، تبریز، ایران

2 استاد گروه مهندسی آب، دانشکده کشاورزی، دانشگاه تبریز، تبریز، ایران

چکیده

در این مطالعه به منظور تعیین اثرات سرعت­های مختلف باد در ساعات شب و روز بر عملکرد پنج نوع آبپاش ضربه­ای طی دوره رشد گیاهان، با استفاده از مدل­های سری زمانی به پیش­بینی مقادیر سرعت باد سه سال پیش رو در منطقه تبریز پرداخته شد و مدل ARIMA(2,0,0)(0,1,1)24 برای هر دو سری داده­های سرعت باد روز و شب مناسب تشخیص داده شد. در گام بعدی با استفاده از الگوهای توزیع حاصل از آزمایش­های مزرعه­ای انجام یافته برای آبپاش­های IRRILINE IR30، VYR 35 و RAINBIRD-40B و با لحاظ تأثیر همپوشانی آن­ها در آرایش­ها و ابعاد مختلف شبکه قرارگیری آبپاش­ها، یکنواختی پخش آب در سه کلاس سرعت باد ( 2-0، 4-2 و بیش از 4 متر بر ثانیه) طی دوره رشد گیاه مورد بررسی قرار گرفت. بعلاوه شبیه­سازی الگوهای توزیع آب دو نوع آبپاش RC 130H MEGA و VYR 70 نیز با اجرای برنامه Ador-Sprinkler برای سرعت­های مختلف باد و انواع آرایش آبپاش­ها به انجام رسید. بر اساس نتایج، بین سرعت­های باد روز و شب در فصل بهار اختلاف نسبتاً قابل توجهی وجود داشت اما در فصل تابستان این اختلاف قابل ملاحظه نبود. در طول دوره رشد، آبیاری شبانه ضریب یکنواختی پخش آبپاش­های مورد استفاده در آزمایش را به طور متوسط 46/3 درصد نسبت به آبیاری در روز افزایش داد. در مورد آبپاش­های شبیه سازی شده نیز، مقدار این افزایش به طور متوسط 84/2 درصد بدست آمد. با توجه به نتایج بدست آمده، به طور کلی می­توان بیان نمود که آبیاری شبانه در ماه­های فصل بهار به دلیل کاهش تلفات بادبردگی و در ماه­های فصل تابستان به دلیل کاهش تلفات تبخیر نسبت به آبیاری در اوقات روز قابل توصیه می­باشد. 

کلیدواژه‌ها


عنوان مقاله [English]

Analyzing the Day and Night Time Wind Characteristics and Their Effects on the Performance of Sprinkler Irrigation Systems

نویسندگان [English]

  • Yalda Seraj Rezaei 1
  • Reza Delirhasannia 2
1 MS.c, Department of Water Engineering, Faculty of Agriculture, University of Tabriz., Tabriz., Iran
2 Assistant Professor, Department of Water Engineering, Faculty of Agriculture, University of Tabriz., Tabriz., Iran
چکیده [English]

In this study in order to investigate the effects of wind speed in the day and night time on the performance of five impact sprinklers in the growth season, the wind speed values were forecasted for three years ahead in Tabriz region using time series models and ARIMA(2,0,0)(0,1,1)24 was detected as the appropriate model for both day and night time wind speed series. In the next step the water distribution patterns of three experimental sprinklers of IRRILINE IR30, VYR 35 and RAINBIRD 40B were overlapped in various shapes and spacing and water application uniformities were evaluated for each case and three different classes of wind speed (0-2, 2-4 and > 4 ms-1) during growth season. Additionally, to simulate distribution patterns and coefficients of uniformity of two more sprinklers of MEGA RC 130H and VYR 70, Ador-Sprinkler software was applied in the different wind speeds and sprinklers spacing. The results showed that the difference between day and night time wind speeds is relatively significant in the spring months, while that is almost negligible in the summer. Generally, in the growth season, night time irrigation improves application uniformity up to 3.46% for experimental sprinklers in comparison with day time irrigation. For simulated sprinklers this value was calculated 2.84%, averagely. Regarding to the obtained results it can be stated that night time irrigation practice in the spring and summer months is recommended due to lower wind drift values and lower evaporation losses, respectively.
 

کلیدواژه‌ها [English]

  • Coefficient of uniformity
  • Distribution pattern
  • impact sprinkler
  • time series
  • wind speed
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