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ارزیابی مدلهای مختلف برآورد تبخیر و تعرق مرجع(ETo) در دشت الشتر | ||
تحقیقات آب و خاک ایران | ||
دوره 52، شماره 5 - شماره پیاپی 65، مرداد 1400، صفحه 1409-1421 اصل مقاله (1.54 M) | ||
نوع مقاله: مقاله پژوهشی | ||
شناسه دیجیتال (DOI): 10.22059/ijswr.2021.319027.668894 | ||
نویسندگان | ||
آرین حیدری مطلق1؛ علی حیدر نصرالهی* 2؛ مجید شریفی پور2؛ شادمان ویسی3 | ||
1گروه مهندسی آب ، دانشکده کشاورزی، دانشگاه لرستان. لرستان، ایران. | ||
2استادیار، گروه مهندسی آب، دانشکده کشاورزی، دانشگاه لرستان. لرستان، ایران. | ||
3بخش آب و خاک، مرکز تحقیقات و آموزش کشاورزی و منابع طبیعی کردستان | ||
چکیده | ||
برآورد دقیق مقدار تبخیر و تعرق مرجع(ETo ) در هر منطقه با توجه به اهمیت آن در مدیریت منابع آب و برنامهریزی صحیح آبیاری امری ضروری است. با توجه به وقتگیر و هزینهبر بودن روشهای مستقیم اندازهگیری (ETo )، لذا در بسیاری از موارد از مدلهای تجربی و ریاضی برای این منظور استفاده میگردد که لازمه اطمینان از این مدلها صحتسنجی و ارزیابی آنها با استفاده از دادههای لایسیمتری است. روشهای مختلفی برای تخمین تبخیر و تعرق وجود دارد؛ اما عملکرد این معادلات در شرایط اقلیمی گوناگون متفاوت است. از این رو در این تحقیق 15 مدل مختلف جهت برآورد تبخیر و تعرق مرجع با توجه به نتایج لایسیمتری در منطقه الشتر مورد ارزیابی قرار گرفتند. اطلاعات مورد نیاز مدلهای مختلف جهت برآورد (ETo ) از ایستگاه سینوپتیک الشتر تهیه شد. نتایج ارزیابی آماری نشان داد مدلهای جنسنهیز و تورک از گروه تشعشعی به ترتیب با (14/1 RMSE=) و (42/1 RMSE=) میلیمتر و مدل هارگریوز – سامانی از گروه دمایی با (72/1 RMSE=) میلیمتر بیشترین دقت را جهت برآورد (ETo ) در منطقه مورد مطالعه داشتند. از طرف دیگر مدلهای مییر و WMO از گروه انتقال جرم به ترتیب با (78/4 RMSE=) و (73/4 RMSE=) میلیمتر از دقت بسیار پایینی برخوردار بودند. در نهایت با توجه به اهمیت مدل فائو- پنمن- مانتیث در محاسبات مربوط به تبخیر و تعرق، مقایسه بین مقادیر لایسیمتری و مقادیر برآوردی توسط این مدل نشان داد که مدل فائو-پنمن-مانتیث با مقادیر (83/5 RMSE=) میلیمتر و (10/0 = (R2 دقت پایینی در برآورد مقدار ETo در منطقه دارد. | ||
کلیدواژهها | ||
تبخیر و تعرق؛ لایسیمتر؛ صحتسنجی؛ گیاه مرجع | ||
عنوان مقاله [English] | ||
Evaluation of Different Models for Estimating Reference Evapotranspiration (ETo) in Aleshtar Plain | ||
نویسندگان [English] | ||
aryan heidari motlagh1؛ aliheidar nasrolahi2؛ Majid Sharifipour2؛ shadman veysi3 | ||
1Department of Water Engineering, Faculty of Agriculture, Lorestan University. Lorestan, Iran. | ||
2Department of Water Engineering, Faculty of Agriculture, Lorestan University, Lorestan, Iran. | ||
3Water and Soil Department, Kurdistan Agricultural Research and Training Center and Natural Resources | ||
چکیده [English] | ||
Accurate estimation of reference evapotranspiration (ETo) in each region is necessary due to its significant contribution to water resources management and proper irrigation planning. Since direct (ETo) measurement methods are time consuming and costly, therefore, in many cases, experimental and mathematical models are used for this purpose. These models, however, can’t be used unless they are validated and verified using lysimetric data. A various methods can be used to estimate evapotranspiration; but the performance of these equations are varied from one climatic condition to another. Therefore, in the present study, lysimetric data have been used to evaluate 15 ETo estimation models in Aleshtar region. The data required in different (ETo) estimation models were collected from Aleshtar synoptic station. According to the statistical evaluation results, the Jensen- Haise (RMSE = 1.14) and Turk (RMSE = 1.42) models from the radiation group and the Hargreaves–Samani (HS) model (RMSE = 1.72) from the temperature group were found to be the most accurate ETo estimation models in the study area. On the other hand, Meyer (RMSE = 4.78) and WMO (RMSE = 4.73) models from mass transfer group were found to be the least accurate ETo estimation models, respectively. Finally, taking into account the significance of the FAO Penman-Monteith model in evapotranspiration calculations, comparing lysimetric data with the values estimated by this model showed that the FAO-Penman-Monteith model (RMSE = 5.83 and R2= 0.10) has the least accurate to estimate ETo in the region. | ||
کلیدواژهها [English] | ||
Evapotranspiration, Lysimeter, Validation, Reference plant | ||
مراجع | ||
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