اصلاح ضرایب تعدادی از معادلات برآورد تبخیر-تعرق گیاه مرجع

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکترا، گروه مهندسی علوم و مهندسی آّب، دانشکده کشاورزی و منابع طبیعی، دانشگاه بین‌المللی امام خمینی(ره)، قزوین، ایران

2 دانشیار، گروه علوم و مهندسی آّب، دانشکده کشاورزی و منابع طبیعی، دانشگاه بین‌المللی امام خمینی(ره)، قزوین، ایران

3 استادیار، گروه علوم و مهندسی آّب، دانشکده کشاورزی و منابع طبیعی، دانشگاه بین‌المللی امام خمینی(ره)، قزوین، ایران

چکیده

ایران در کمربند خشک و نیمه­خشک کره زمین قرار گرفته است که ریزش­های کم جوی، رگبارهای شدید، وقوع جریان­های سیلابی و تبخیر-تعرق زیاد از ویژگی­های آن به شمار می­آید. بنابراین، ارزیابی کمی تبخیر-تعرق در سطح منطقه‌ای، به‌منظور مدیریت منابع آب، تولید محصول و ارزیابی­های زیست­محیطی در مناطق تحت آبیاری، ضروری است. در این پژوهش برای تخمین تبخیر-تعرق گیاه مرجع (ET0) در چهار ایستگاه سینوپتیک انتخابی با اقلیم­های خشک، نیمه­خشک، مرطوب و نیمه­مرطوب، از داده­های هواشناسی همچون دما، تابش خالص، رطوبت نسبی و سرعت باد برای سال‌های 1388-1368 استفاده شد. تبخیر-تعرق گیاه مرجع با استفاده از روش­های FAO-56، هارگریوز-سامانی، بلانی-کریدل، پریستلی-تیلور، تورک و مک­کینک محاسبه و ضرایب آنها برای برآورد دقیق­تر تبخیر-تعرق اصلاح شد. به‌منظور ارزیابی این روش­ها از آماره‌های میانگین خطای مطلق، میانگین جذر مربعات خطا، میانگین خطای اریب، ضریب همبستگی، شاخص نش-ساتکلیف استفاده شد. بر اساس این شاخص­ها، روش بلانی-کریدل، پس از روش FAO-56 که به‌عنوان مبنا قرار گرفت، به‌عنوان روش برتر برای چهار اقلیم مشخص شده در ایران انتخاب شد.

کلیدواژه‌ها


عنوان مقاله [English]

Modification of the Coefficients of some Equations for Estimation of Evapotranspiration of the Reference Plant

نویسندگان [English]

  • Fatemeh Safari 1
  • Abbas Kaviani 2
  • Asghar Azizian Ghatar 3
  • Hadi Ramezani Etedali 2
1 PhD Scholar, Department of Water Science and Engineering, Faculty of Agricultural and Natural Resources, Imam Khomeini International University, Qazvin, Iran
2 Assoc. Professor, Water Science and Engineering Department, Faculty of Agricultural and Natural Resources, Imam Khomeini International University, Qazvin, Iran
3 Assist. Professor, Water Science and Engineering Department, Faculty of Agricultural and Natural Resources, Imam Khomeini International University, Qazvin, Iran
چکیده [English]

Iran is located in the arid and semi-arid belt of the world, which is characterized by low rainfall, thunderstorms, flood flows, and high evapotranspiration. Therefore, quantitative evaluation of evapotranspiration on a regional scale is necessary for water resources management, crop production, and environmental assessments in irrigated lands. In this study, to estimate ETo in four synoptic stations with arid, semi-arid, humid, and semi-humid climates, meteorological data such as temperature, net radiation, relative humidity, and wind speed were used for 1990-2010. Potational evapotranspiration was calculated using 5 different methods, including Hargreaves-Samani, Blaney-Criddle, Priestly-Tailor, Turc, and Makkink, besides, the standard FAO-56 was used (because there was no Lysimetric regionally data) to evaluate the applied formulas. In order to evaluate these methods, were used the mean absolute error (MAE), root mean squared error (RMSE), mean bias error (MBE), correlation coefficient (r), Nash -Satclif index (N.S). Based on these indices, Blaney-Criddle method, after the FAO-56 method, which was used as the basis, was selected as the superior method for the four climates in Iran.

کلیدواژه‌ها [English]

  • Blaney-Criddle
  • evapotranspiration
  • FAO-56
  • Iran
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