توسعه مدل تحلیل ریسک خشکسالی در سامانه‌های تأمین آب کشاورزی شبکه آبیاری رودشت شمالی با استفاده از شبکه بیزین

نویسندگان

1 دانشجوی دکترای مهندسی منابع آب، گروه مهندسی آبیاری، پردیس ابوریحان، دانشگاه تهران.

2 دانشیار گروه مهندسی آبیاری، پردیس ابوریحان، دانشگاه تهران.

3 دانشیار گروه مهندسی آبیاری پردیس ابوریحان دانشگاه تهران

چکیده

کشاورزی از مهمترین بخش­های اقتصادی ایران و بزرگترین مصرف کننده منابع آب سطحی و زیرزمینی به­حساب می­آید. از آنجایی که خطرات مختلفی سامانه­های تأمین آب کشاورزی را تهدید می­کند، لذا توسعه چارچوب تحلیل ریسک به­منظور شناسایی و بررسی میزان تأثیر خطرات پیش­روی سامانه­های مذکور در پیش­برد توسعه پایدار کشاورزی اجتناب­ناپذیر است. از این رو، تحقیق حاضر برای نخستین بار اقدام به توسعه مدل تحلیل ریسک خطر خشکسالی در سامانه تأمین آب کشاورزی با کمک شبکه بیزین نموده است. ساختار این مدل، که متشکل از گره­ها و ارتباط بین آنها است، به­گونه­ای طراحی شده که با استفاده از اطلاعات دبی رودخانه، آب رهاسازی شده از سامانه انحراف آب بالادست شبکه، حجم آب زیرزمینی برداشت شده و تقاضای شبکه آبیاری، مقدار ریسک سامانه تأمین را ارزیابی کند. به­منظور بررسی توانایی مدل توسعه داده شده، تحلیل ریسک سامانه تأمین آب کشاورزی شبکه آبیاری مدرن رودشت اصفهان مورد بررسی قرار گرفت.مقادیر ریسک سامانه تأمین آب شبکه رودشت در بازه صفر تا 11/58 % و به‏طور متوسط برابر 82/39%(برای 78 رویداد مختلف)برآورد شد. نتایج نشان داد که این مدل در دو بخش آموزش و آزمایش به ترتیب با مقدار جذر میانگین مربعات خطا 09/0 و 1/0، ضریب تبیین 85/0 و 75/0 و شاخص کل عملکرد 74/0 و 82/0 دارای دقت و عملکرد مناسبی در برآورد ریسک است. نتایج این تحقیق و مدل ارایه شده به بهره­برداران و تصمیم­گیرندگان کمک می­کند تا برنامه­ریزی بهتری برای تخصیص آب آبیاری بر اساس ریسک‏های پیش‏بینی شده در شرایط خشکسالی هیدرولوژیکی ارائه نمایند.

کلیدواژه‌ها


عنوان مقاله [English]

Development of Drought Risk Analysis Model in Agricultural Water Supply Systems of Northern Roodasht Irrigation Network Using Bayesian Network

نویسندگان [English]

  • Atiyeh Bozorgi 1
  • Abbas Roozbahani 2
  • Seied Mehdy Hashemy shahdany 3
1 Department of Irrigation and Drainage Engineering, Aburaihan Campus, University of Tehran, Tehran, Iran
2 Associate Professor, Department of Irrigation Engineering, Aburaihan Campus, University of Tehran.
3 Associate Professor, Department of Irrigation Engineering, College of Aburaihan, University of Tehran
چکیده [English]

Agriculture is one of the most important economic sectors of Iran and the largest consumer of surface and underground water resources. Since various risks threaten agricultural water supply systems, developing a risk analysis framework is inevitable in order to identify and assess the impact of the aforementioned systems on promoting sustainable agricultural development. Therefore, for the first time, the present study has attempted to develop a drought risk analysis model for agricultural water supply system with the Bayesian network. The structure of this model, which consists of nodes and their interactions, is designed by using river discharge, water released from the upstream water diversion system, groundwater and irrigation network demand to provide system risk. In order to investigate the capability of the developed model, the risk analysis of the modern Roodasht Irrigation System in Isfahan was investigated. The risk values of the Roodasht agricultural water supply system were estimated in the range of zero to 58.11% and an average of 39.82%. The results showed that this model has good accuracy and performance in both training and test sections, with the root mean squares error of 0.09 and 0.1, coefficient of determination of 0.85 and 0.75, and overall index of model performance of 0.82 and 0.74. The results of this research and the proposed model helps operators and decision makers to better plan the allocation of irrigation water based on the risks predicted in hydrological drought conditions.

کلیدواژه‌ها [English]

  • Surface and groundwater resources
  • Hydrological drought
  • Water allocation
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