مدل سازی منطقه ای عملکرد گندم با استفاده از مدل اگروهیدرولوژیکی- توزیعیSWAP (مطالعه موردی: شبکه آبیاری و زهکشی درودزن)

نوع مقاله: پژوهشی

نویسندگان

1 دانشجوی دکتری، گروه علوم و مهندسی آب، دانشکده کشاورزی و منابع طبیعی دانشگاه آزاد اسلامی واحد علوم و تحقیقات تهران

2 استادیار گروه علوم و مهندسی آب، دانشکده کشاورزی و منابع طبیعی دانشگاه آزاد اسلامی واحد علوم و تحقیقات تهران

3 استادیار گروه آبیاری دانشکده کشاورزی دانشگاه گیلان

4 دانشیار گروه علوم و مهندسی آب، دانشکده کشاورزی و منابع طبیعی دانشگاه آزاد اسلامی واحد علوم و تحقیقات تهران

چکیده

بسیاری از تصمیم­گیری­ها و سیاستگذاری­ها در مدیریت آب آبیاری در مقیاس مکانی بزرگ‎تر از مزرعه صورت می­گیرد. در این تحقیق مدل توزیعی SWAP برای شبیه­سازی عملکرد گندم در اراضی شبکه آبیاری و زهکشی درودزن در سه سال مرطوب، نرمال و خشک مورد ارزیابی قرار گرفته است. منطقه مورد مطالعه به 86 واحد شبیه­سازی تفکیک گردید و عملکرد محصول در هر یک از واحدهای مکانی، توسط مدل توزیعی SWAP برآورد شد. برای منطقه­ای نمودن مدل SWAP و برقراری ارتباط بین این مدل و داده­های ورودی در هر واحد شبیه‎سازی، از برنامه MATLAB استفاده شد. شاخص­های آماری ضریب همبستگی و حداکثر خطا به ترتیب در حدود 88 درصد و 94/0 تن در هکتار محاسبه گردید. میانگین مربعات خطا کمتر از انحراف معیار داده­ها بوده و کارایی مدل­سازی در حد مطلوبی ارزیابی ­شد. در این تحقیق میزان عملکرد در دوره شبیه­سازی بیش از مقادیر اندازه­گیری شده برآورد گردید. هم‎چنین در مزارع واقع در انتهای شبکه به دلیل کمبود آب و شوری خاک، خطای عملکرد شبیه­سازی شده بیش از سایر واحدهای مکانی ­بود. در مجموع ارزیابی نتایج مدل­سازی حاکی از آن است که تطابق خوبی بین مقادیر عملکرد شبیه­سازی شده با عملکرد اندازه­گیری شده در شبکه آبیاری درودزن وجود دارد، بنابراین می‎توان از مدل توزیعیSWAP با دقت مناسبی برای شبیه­سازی و پیش­بینی عملکرد محصول و مدیریت آب آبیاری در شبکه­ استفاده نمود.

کلیدواژه‌ها


عنوان مقاله [English]

Regional modeling of wheat yield production using the distributed agro-hydrological SWAP: (case study: Doroudzan irrigation and drainage network)

نویسندگان [English]

  • Elnaz Noroozi 1
  • Hosein Babazadeh 2
  • Majid Vazifehdoost 3
  • Fereidoon Kaveh 4
1 Ph.D. Student, respectively, Science and Research Branch, Islamic Azad University of Tehran, Tehran, Iran.
2 Assistant Prof, respectively, Science and Research Branch, Islamic Azad University of Tehran, Tehran, Iran.
3 Assistant Prof., Agriculture Faculty, Gilan University, Gilan, Iran.
4 Associate Prof., respectively, Science and Research Branch, Islamic Azad University of Tehran, Tehran, Iran.
چکیده [English]

Many decisions and policies in water management are made in a spatial scale larger than farm scale. In this study, the distributed SWAP model was evaluated to simulate wheat yield production in the Doroudzan irrigation and drainage network (Fars province, Iran) in wet, normal and dry years. The study area was divided into 86 simulation units and yield production was determined in each spatial unit with the distributed SWAP. MATLAB program was used for regionalizing the SWAP model and making relationship between this model and input data in each simulation unit. The goodness-of-fit measures, such as correlation coefficient and maximum error were calculated as 88% and 0.94 ton/ha, respectively. In addition, the determined mean square error was less than standard deviation and the modeling efficiency was estimated satisfactorily. In this research, yield production in the simulation period was evaluated higher than the observed values. In farms located at the end of the network, the error percentage of the simulated performance was higher than other spatial units due to water deficit and soil salinity. In general, since there was a good consistency between simulated and observed crop production in Doroudzan network, distributed SWAP model can be used with a good accuracy to simulate and predict yield production and to manage irrigation network.

کلیدواژه‌ها [English]

  • Wheat
  • yield
  • production
  • simulation
  • distributed SWAP

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