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چکیده

از پارامترهای مهم در طراحی سیستم­های آبیاری قطره­ای سطحی و زیر سطحی در نظر گرفتن الگوی سطح خیس شده بالای و پایین قطره‌چکان می­باشد. در این تحقیق از یک مدل فیزیکی شفاف (مکعب مستطیل) از جنس پلی­کربنات به ابعاد 5/0×1×3 استفاده شد و آزمایشات بر روی سه نوع بافت خاک (سبک، متوسط و سنگین)، با سه نوع دبی قطره چکان (2، 4 و 6 لیتر در ساعت)، در سه عمق مختلف نصب قطره­چکان (صفر، 15 و 30 سانتی­متری) به انجام رسید. همچنین این آزمایشات برای دو نوع سیستم آبیاری پیوسته و پالسی صورت گرفت که در آبیاری پالسی، زمان قطع و وصل پالس­ها مقادیر 30-30، 20-40 و 40-20 دقیقه در نظر گرفته شد که عدد اول بیانگر زمان آبیاری و عدد دوم زمان استراحت سیستم در هر چرخه خواهد بود. سپس با استفاده از آنالیز رگرسیون غیرخطی و در نظر گرفتن متغیرهای زمان آبیاری، دبی قطره­چکان، هدایت هیدرولیکی اشباع، درصد شن و سیلت و رس، چگالی ظاهری خاک، رطوبت اولیه خاک، عمق نصب قطره­چکان و همچنین نسبت پالس (نسبت زمان آبیاری در هر چرخه به زمان کل یک چرخه) روابطی برای تخمین سطح خیس شده جبهه رطوبتی ارائه گردید. نتایج مقایسه بین مقادیر اندازه گیری و شبیه­سازی شده نشان داد که مدل رگرسیون غیر خطی با دقت بالایی سطح خیس شده جبهه رطوبتی را برآورد می­کند. در نظر گرفتن این روابط در طراحی سامانه­های آبیاری قطره­ای سطحی و زیر سطحی می­تواند باعث بهبود عملکرد این سیستم­ها شود.

جزئیات مقاله

کلمات کلیدی

آبیاری قطره¬ای, پیاز رطوبتی, شبیه¬سازی, مساحت خیس شده, مدیریت آبیاری

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ارجاع به مقاله
کریمیب., & کریمین. (2020). شبیه¬سازی مساحت خیس شده پیاز رطوبتی در سیستم آبیاری قطره¬ای پالسی. آب و خاک, 34(2), 349-364. https://doi.org/10.22067/jsw.v34i2.82228
نوع مقاله
علمی - پژوهشی