Since air temperature records are readily available around the world, the models based on air temperature for estimating solar radiation have been widely accepted. In this paper, a new model based on Hargreaves and Samani (HS) method for estimating monthly average daily global solar radiation is proposed. With statistical error tests, the performance of the new model is validated by comparing w...

Abdelaziz Boulesbaa,* Bing Huang, Kai Wang, Ming-Wei Lin, Masoud Mahjouri-Samani, Christopher Rouleau, Kai Xiao, Mina Yoon, Bobby Sumpter, Alexander Puretzky, and David Geohegan Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, 1 Bethel Valley Road, Oak Ridge, Tennessee, 37831, USA (Received 29 April 2015; revised manuscript received 28 August 2015; published 25 September ...

Objetivou-se determinar modelos de estimativa da evapotranspiração referência (ETo) para a região sul do Triângulo Mineiro. Para calcular as estimativas ETo foram utilizados dados diários INMET Frutal, Conceição das Alagoas e Uberaba-MG. Foram testados seis assim compará-los com o modelo Penman Monteith (PM), que foi considerado padrão. Após cálculo diária, aplicada análise regressão, utilizand...

Daily evapotranspiration (ET) rates are needed for irrigation scheduling. Owing to the difficulty of obtaining accurate field measurements, ET rates are commonly estimated from weather parameters. A few empirical or semi–empirical methods have been developed for assessing daily reference crop ET, which is converted to actual crop ET using crop coefficients. The FAO Penman–Monteith method, which...

Evaporation is a fundamental parameter in the hydrological cycle. This study examines the performance of M5model tree and artificial neural network (ANN) models in estimating potential evapotranspiration calculated byPenman- Monteith and Hargreaves- Samani equations. Daily weather data from two meteorological stations in asemi-arid climate of Iran, namely Kerman and Zahedan, were collected duri...

El trabajo se desarrolló con el objetivo de comparar los valores evapotranspiración obtenidos a partir cuatro métodos indirectos empíricos en localidades interés agrícola la provincia Holguín. Fueron utilizados datos medios mensuales las estaciones meteorológicas La Jíquima, Guaro, Pinares Mayarí y Velasco. Los aplicados fueron Hargreaves, Hargreaves Samani, Thornthwaite Blaney-Criddl...

Abbasi Devleti’nin çevreyi kontrol etme gücünün zayıflamasına paralel olarak müstakil hanedanlıklar ortaya çıkmıştır. Bunlardan birisi de Mâverâünnehir ve Horasan coğrafyasında hâkimiyeti ele geçiren Sâmânî Hanedanlığıdır. Merkezi gücün dağılma sürecine girdiğini fark eden Hanedanlığı varlığını sürdürmek için farklılıkları bünyesinde tutma esasına dayalı yönetim sistemini uygular. Farklı inanç ...