نتایج جستجو برای: potential evapotranspiration

تعداد نتایج: 1073205  

Journal: :Journal of Hydrology: Regional Studies 2022

Zamra catchment, Upper Tekeze Basin, Northern Ethiopia. Direct field estimates of potential evapotranspiration (PET) remain a challenge, because they are expensive and have limited spatial representativeness. An alternative is to derive PET by remote sensing as product reference (ETo) land use-land cover (LULC) factor (Kc). The aims this study were to: i) validate satellite-derived Daily Refere...

Journal: :Journal of Applied Meteorology and Climatology 2015

2012
Boris Faybishenko

Evaluation of evapotranspiration uncertainty is needed for proper decision-making in the fields of water resources and climatic predictions (Buttafuoco et al., 2010; Or and Hanks, 1992; Zhu et al., 2007). However, in spite of the recent progress in soil-water and climatic uncertainty quantification, using stochastic simulations, the estimates of potential (reference) evapotranspiration (Eo) and...

Journal: :Kansas Agricultural Experiment Station Research Reports 1997

Gholamreza Zehtabian Hassan Khosravi Kamran Karimi Mahsa Mirdashtvan Sara Nakhaee nezhad fard,

Comparability analyses are performed to investigate similarities/differences of the standard precipitation index (SPI) and the reconnaissance drought index (RDI), respectively, utilizing precipitation and ratio of precipitation over potential evapotranspiration (ET0). Data are from six synoptic stations in south Khorasan province in Iran.At the first for calculating SPI, the elevation-precipita...

ژورنال: علوم آب و خاک 2002
علی‌ اکبر کامکار حقیقی, , علیرضا سپاسخواه, , نادر پیرمرادیان, ,

This research was conducted in Kooshkak Farm Research Station of Shiraz University in 1997 and 1998 in order to determine crop coefficient and water requirements of rice, using lysimeter. The variety used was Champa-Kamfiroozi which is an early mature variety and is grown by most farmers in the area. Results showed that potential evapotranspiration varied from 3.76 to 9.34 mm/day. Penman FAO me...

Journal: :آب و خاک 0
محمد قبائی سوق ابوالفضل مساعدی موسی حسام ابوطالب هزارجریبی

abstract process of evapotranspiration (eto) is a major component of the hydrologic cycle that its accurate estimation plays an important role to achieve sustainable development in water balance, irrigation system design and planning and management of water resources. being a function of different metrological parameters and their interactions, evapotranspiration is a complex, nonlinear phenome...

Journal: :Remote Sensing 2017
Brent M. Lofgren

A statement in this recently published paper makes a point that is largely at odds with the main point of the paper that is cited. Stating that higher air temperatures lead to greater evapotranspiration is an oversimplification; the true story is more complex. Although this is by no means central to the conclusions of the paper being commented on, we have demonstrated the danger in taking too l...

2016
Long Wan Jing Tong Jinxing Zhou Hongyan Guo Ming Cui Yuguo Liu Like Ning Fukai Tang

Over the past several decades, rocky desertification has led to severe ecological problems in karst areas in South China. After a rocky desertification treatment project was completed, the vegetation coverage changed greatly and, consequently, increased the ecology water consumption (approximately equal to the actual evapotranspiration) of the regional vegetation. Thus, it intensified the regio...

علی‌ اکبر کامکار حقیقی, , علیرضا سپاسخواه, , نادر پیرمرادیان, ,

This research was conducted in Kooshkak Farm Research Station of Shiraz University in 1997 and 1998 in order to determine crop coefficient and water requirements of rice, using lysimeter. The variety used was Champa-Kamfiroozi which is an early mature variety and is grown by most farmers in the area. Results showed that potential evapotranspiration varied from 3.76 to 9.34 mm/day. Penman FAO me...

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