Determination of optimal and and water allocation under limited water resources using soil water balance in Ordibehesht canal of Doroodzan water district

Document Type: Full Article

Authors

1 1Department of Water Engineering, College of Agriculture, Shiraz University, Shiraz, I. R. Iran

2 Department of Water Engineering, College of Agriculture, Urmia University, Urmia, I. R. Iran

Abstract

ABSTRACT- Inadequate water supply is the major problem for agriculture in arid and semi-arid regions. Thus, effective management should be considered for water resources planning. In this research, a model was provided which is able to estimate optimal land and water allocation in the Doroodzan irrigation network. Optimal water management model was used at farm level to evaluate different deficit irrigation (DI) strategies at various periods of crop growth. Genetic algorithm toolbox by MATLAB (Mathworks, 2009) software was used for benefit optimization considering practical constraints. Results showed that deficit irrigation technique significantly reduced water allocation and increased the crops cultivation area in the region. In addition, increase in water price and the occurrence of drought resulted in cropping pattern change and led to including crops with high economic values. Application of this model ensures the optimal use of available water resources in all conditions, especially under drought condition. The proposed model is capable of defining water management plan with regard to the amount of available water and price of water and product, for simultaneous optimal land and water allocation.

Keywords

Main Subjects


Article Title [Persian]

تخصیص بهینه زمین و آب با استفاده از روابط بیلان آب در خاک در منطقه کانال اردیبهشت شبکه درودزن

Authors [Persian]

  • زهرا ربیعی 1
  • تورج هنر 1
  • محمد مهدی باطنی 2
1 دانشگاه شیراز
2 دانشگاه ارومیه
Abstract [Persian]

چکیده- عدم تأمین آب کافی مشکل عمده کشاورزی در مناطق خشک و نیمه خشک است. لذا مدیریت مؤثری باید برای برنامه­ریزی منابع آب در نظر گرفته شود. در این تحقیق، مدلی ارائه شد که قادر به برآورد تخصیص بهینه زمین و آب در شبکه آبیاری درودزن است. مدل بهینه مدیریت آب در مقیاس مزرعه به منظور بررسی راهکار­های مختلف کم آبیاری (DI) در مراحل مختلف رشد گیاه مورد استفاده قرار گرفت. جعبه ابزار الگوریتم ژنتیک MATLAB (محصول Mathworks، 2009) به عنوان نرم افزار بهینه سازی با وجود محدودیت­ها استفاده شد. نتایج نشان داد که روش­های کم­آبیاری، تخصیص آب را  به طور قابل توجهی کاهش و سطح زیر کشت محصولات زراعی را در منطقه افزایش می­دهد. علاوه بر این، افزایش قیمت آب و وقوع خشکسالی منجر به تغییر الگوی کشت و کشت محصولات با ارزش اقتصادی بالا می­گردد. استفاده از این مدل استفاده بهینه از منابع آب در دسترس را در همه شرایط، بخصوص تحت شرایط تنش خشکی، تضمین می­کند. مدل پیشنهادی قادر به تعریف طرح مدیریت آب با توجه به مقدار آب در دسترس، قیمت آب و محصول، برای تخصیص همزمان بهینه زمین و آب است.

Keywords [Persian]

  • واژه های کلیدی:
  • مدیریت آب کشاورزی
  • کم آبیاری
  • آلگوریتم ژنتیک
  • الگوی کشت بهینه
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