ارزیابی عملکرد روش های برآورد ضرایب معادله نفوذ کوستیاکف در آبیاری جویچه ای با جریان موجی

نویسندگان

1 دانشجوی کارشناسی ارشد، گروه علوم و مهندسی آب، دانشکده کشاورزی، دانشگاه زنجان

2 استادیار، گروه علوم و مهندسی آب، دانشکده کشاورزی، دانشگاه زنجان

3 دانشیار، گروه مهندسی آبیاری و آبادانی، پردیس کشاورزی و منابع طبیعی، دانشگاه تهران

چکیده

به منظور افزایش راندمان کاربرد و یکنواختی توزیع آب در روش‌های آبیاری سطحی، تکنیک‌هایی نظیر کاربرد جریان موجی توسعه داده شده است. یکی از ملزومات طراحی مناسب و کارآمد آبیاری موجی، تعیین دقیق پارامترهای معادله نفوذ آب در خاک می‌باشد. هدف از تحقیق حاضر بررسی عملکرد سه روش دو نقطه‌ای الیوت و واکر، یک نقطه‌ای شپارد و روش رگرسیون غیرخطی در تخمین نفوذ آب در آبیاری جویچه‌ای با جریان موجی می‌باشد. به همین منظور از داده‌های ارزیابی مزرعه‌ای سه جویچه آزمایشی شامل دو جویچه با جریان موجی و یک جویچه با جریان پیوسته استفاده شد. طول جویچه‌ها 150 متر، فواصل آن‌ها 75/0 متر و بافت خاک (لوم رسی) بود. نتایج نشان داد که روش یک نقطه‌ای ضعیف‌ترین عملکرد را در برآورد نفوذ در جویچه‌های با جریان موجی و همچنین جریان پیوسته داشت. از سوی دیگر نتایج دو روش رگرسیون غیر خطی و دونقطه‌ای قابل قبول و نزدیک به هم بدست آمد. مقادیر شاخص جذر میانگین مربعات خطا روش‌های یک نقطه‌ای، دونقطه‌ای و رگرسیون غیرخطی در پیش‌بینی زمان پیشروی جویچه‌های با جریان موجی به ترتیب ۸۵/۱۰، 52/۲ و 46/۲ دقیقه و در جریان پیوسته به ترتیب ۷۸/۸، ۵۷/۶ و ۷۷/۴ دقیقه بدست آمد. همچنین مقادیر میانگین خطای نسبی روش‌های مذکور در برآورد حجم آب نفوذ یافته در جویچه‌‌های با جریان موجی به ترتیب12/42، 51/3 و 79/4 درصد و در جریان پیوسته به ترتیب 70/7، 33/6 و 53/2 درصد برآورد شد. نتایج نشان داد، روش رگرسیون غیرخطی عملکرد بهتری در برآورد نفوذ در آبیاری جویچه‌ای با جریان موجی و پیوسته داشت.

کلیدواژه‌ها

عنوان مقاله [English]

Evaluation of the Performance of Methods for Estimating the Coefficients of Kostiakov Infiltration Equation in Furrow Irrigation with Surge Flow

نویسندگان [English]

  • Mohammad Mahdi Jafari 1
  • hassan ojaghlu 2
  • Hamed Ebrahimian 3
1 MSc. Student, Dept. of Water Sciences and Engineering, Faculty of Agriculture, University of Zanjan
2 Assist. Prof., Dept. of Water Sciences and Engineering, Faculty of Agriculture, University of Zanjan
3 Assoc. Prof., Dept. of Irrigation and Reclamation Engineering, College of Agriculture and Natural Resources, University of Tehran
چکیده [English]

In order to increase the application efficiency and distribution uniformity in surface irrigation methods,some techniques such as the application of surge flow have been developed.One of the requirements for proper and efficient design of surge irrigation is to accurately determine the infiltration equation parameters.The purpose of the present study was to investigate the performance of three methods:Elliott and Walker two-point, Shepard one-point and nonlinear regression methods in estimating water infiltration in furrow irrigation with surge flow.For this purpose,the field evaluation data of three experimental furrow included two furrows under surge flow and a furrow with continuous flow were used.The length and spacing of the furrows was 150m and 0.75m,respectively.The soil texture was clay loam.The results showed that the one-point method had the lowest performance in estimating the infiltration in furrow with surge and continuous flow.On the other hand,the results of nonlinear regression and two point methods were acceptable and close to each other.The mean values of root mean square error index for the one-point, two-point and nonlinear regression methods in estimating the advance times under surge flow were 10.85, 2.52 and 2.46 min,respectively, and in furrows under continuous flow were 8.87, 6.57 and 4.77 min, respectively.Also, the values of mean relative error in estimating the volume of infiltrated water in the furrows with surge flow were 42.12, 3.51 and 4.79, respectively,and for continuous flow were 7.70, 6.33 and 2.53, respectively.Results indicated that, the nonlinear regression method performed better in estimating the infiltration of furrow irrigation under surge and continuous flows.

کلیدواژه‌ها [English]

  • Furrow irrigation
  • Infiltration
  • Simulation
  • Surge flow
  • WinSRFR

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دانش آب و خاک
دوره 32، شماره 4
دی 1401
صفحه 17-32

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