METRIC Modeli ve Google Earth Engine Flux ile Hesaplanan Günlük Bitki Su Tüketimi ve Referans Bitki Su Tüketimi Fraksiyonu Değerlerinin Karşılaştırılması

Year 2022, Volume: 8 Issue: 2, 256 - 267, 22.08.2022

Emre Tunca , Eyüp Selim Köksal , Sakine Çetin Taner

https://doi.org/10.24180/ijaws.1061823

Abstract

Evapotranspirasyonun (ET) hassas bir biçimde belirlenmesi su kaynakları yönetiminde oldukça önemlidir. Son yıllarda ET’nin uzaktan algılama teknikleri yardımıyla belirlenmesinde çeşitli modeller geliştirilmiştir. Bu modeller arasında Evapotranspirasyon Haritalamasında Yüksek Çözünürlük ve İçsel Kalibrasyon Modeli (METRIC) en yaygın kullanılanlardan biridir. METRIC modelinde içsel kalibrasyon amacıyla ET’nin potansiyel seviyede ve ET’nin sıfır olduğu iki ekstrem koşulu temsilen seçimler yapılması gerekmektedir. Bu seçimleri hem uzaktan algılama hem de ET üzerine deneyimli kişilerin yapması gerekmektedir. Ancak bu durum METRIC modelinin kullanımını kısıtlamaktadır. Oluşan bu boşluğun doldurulması için Google Earth Engine platformunda Earth Engine Evapotranspiration Flux (EEFlux) uygulaması geliştirilmiştir. Bu uygulamayla METRIC modeli otomatik olarak kalibre edilmektedir. Bu çalışmanın amacı elle METRIC modeli ile EEFlux modelinden elde edilen günlük ET (ETd) ve Referans ET fraksiyonu (ETrF) değerlerinin karşılaştırılmasıdır. Çalışma Amasya ili Merzifon ilçesinde yer alan Uzunyazı, Çayırözü ve Yeşilören köylerindeki arpa, ayçiçeği, buğday, mısır, şeker pancarı, patates ve soğan yetiştiriciliği yapılan tarım alanlarında gerçekleştirilmiştir. Araştırmada üç farklı tarihe ait Landsat 8 uydu görüntüleri kullanılmıştır. Çalışmadan elde edilen sonuçlara göre METRIC ve EEFLUX ile hesaplanan ETd değerleri uyumlu olmasına rağmen (R2=0,87), genel olarak EEFlux-ETd değerleri METRIC-ETd değerlerinden daha düşük gerçekleşmiştir (RMSE=2,5 mm gün-1 ve MAE=2,38 mm gün-1). ETrF değerleri ise ETd değerlerine benzer uyumla hesaplanmıştır (R2=0,88, RMSE=0,11 ve MAE=0,09). Buna göre EEFLUX ve METRIC ile hesaplanan ETd ve ETrF değerleri arasında belirli farklılıklar olmasına rağmen, EEFLUX ile oldukça hızlı, yerel iklim verileri ve deneyimli bir kullanıcı ihtiyacı olmadan ETd değerleri belirlenebilmektedir.

Keywords

Bitki su tüketimi, uzaktan algılama, METRIC, GEEFLUX, ETrF.

Supporting Institution

Türkiye Bilimsel ve Teknolojik Araştırma Kurumu (TÜBİTAK)

Project Number

114O534

Thanks

Bu çalışma Türkiye Bilimsel ve Teknolojik Araştırma Kurumu (TÜBİTAK) tarafından desteklenmiştir (Proje No: 114O534).

Comparison of Daily Evapotranspiration and Reference Evapotranspiration Fraction Values Calculated using METRIC Model and Google Earth Engine FLux

Abstract

Accurate evapotranspiration (ET) calculation is crucial in water resources management. In recent years, various remote sensing techniques based models have been developed to determine ET. Among these models, Mapping EvapoTranspiration at High Resolution with Internalized Calibration (METRIC) is one of the most widely used. In the METRIC model, anchor pixels must be selected to represent extreme conditions where ET is at potential level and ET is zero in the internal calibration process. These choices should be made by experienced users in both remote sensing and ET. However, this limits the use of the METRIC model. In order to fill this gap, the Earth Engine Evapotranspiration Flux (EEFlux) application was developed in the Google Earth Engine platform. With this application, the METRIC model is calibrated automatically. The aim of this study was to compare the daily ET (ETd) and Reference ET fraction (ETrF) values obtained from the METRIC and EEFlux model. The study was carried out in the agricultural fields of barley, sunflower, wheat, corn, sugar beet, potato and onion cultivation in Uzunyazı, Çayırözü and Yeşilören villages in Merzifon district of Amasya province. Landsat 8 satellite images of three different dates were used in this research. According to the results obtained from this study, although the ETd values calculated with METRIC and EEFlux were compatible (R2=0.87), the
EEFlux-ETd values were generally lower than the METRIC- ETd values (RMSE=2.5 mm day-1 and MAE=2.38 mm day-1). Calculated ETrF values were calculated with similar agreement to ETd values (R2=0.88, RMSE=0.11 and MAE=0.09). Accordingly, although there are certain differences between ETd and ETrF values calculated with EEFlux and METRIC, ETd values can be determined very quickly with EEFlux, without the need for local climate data and an experienced user.

Keywords

Evapotranspiration, Remote Sensing, METRIC, GEEFLUX, ETrF.

Project Number

114O534

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