Results 241 to 250 of about 170,268 (263)
Some of the next articles are maybe not open access.
Methods to estimate daily evapotranspiration from hourly evapotranspiration
Biosystems Engineering, 2017Remote sensing provides an effective way for the estimation of regional evapotranspiration, therefore, a reliable scaling-up method from instantaneous evapotranspiration (ET) to daily ET is of great importance. In this paper, five commonly used scaling-up methods estimating daily ET from hourly latent heat measurements were compared under different ...
He Chen +3 more
openaire +2 more sources
Measurement and Estimation of Evapotranspiration
1996Evapotranspiration is a major term of the soil water balance. Knowing the amount of water directly evaporated from the soil or through transpiration of plants is a point of interest not only for agronomists but for meteorologists, hydrologists and irrigation project managers.
openaire +4 more sources
Evapotranspiration: Concepts and Future Trends
Journal of Irrigation and Drainage Engineering, 1999Past research on evapotranspiration has provided sound theoretical knowledge and practical applications that have been validated through field measurements. Many different approaches have been used; however, when primary concepts and standard definitions are accepted, it is possible to find reasonable agreement among methods.
Pereira, L.S. +3 more
openaire +4 more sources
An evaluation of common evapotranspiration equations
Irrigation Science, 1999A comparison is made between the Pruitt and Doorenbos version of an hourly Penman-type equation, the Food and Agriculture Organization (FAO) hourly Penman-Monteith equation, and an independent measure of reference evapotranspiration (ET0) from lysimeter data. Reducing the canopy resistance improved the hourly FAO Penman-Monteith estimates. Daytime soil
Ventura F. +3 more
openaire +4 more sources
Evaporation and Evapotranspiration
2013Introductory paragraphs: Two phases of the hydrologic cycle of particular interest in agriculture are evaporation and transpiration. About three-fourths of the total precipitation received on land areas of the world returns directly to the atmosphere by evaporation or transpiration. Most of the balance returns to the ocean as surface or subsurface flow.
Stephen R. Workman +3 more
openaire +4 more sources
Evapotranspiration and Ratio of Soil Evaporation to Evapotranspiration of Winter Wheat and Maize
Applied Mechanics and Materials, 2014Evapotranspiration (ETc) is an important quantity for hydrological cycle. This study shows evapotranspiration, the ratio of evaporation to evapotranspiration (E/ETc) of winter wheat and maize in north China. Several relationships, namely, E/ET0 and soil surface moisture, E/ET0 and leaf area index (LAI), are also analyzed.
Zheng Wei, Di Xu, Yu Liu, Jia Bing Cai
openaire +2 more sources
The Estimation of Evapotranspiration
1973To determine irrigation requirements and to design irrigation systems, the irrigationist must know the evaporation losses from crops. The physics of evaporation treated in Chapter 3 indicate that these losses could be assessed from purely meteorological considerations.
openaire +2 more sources
Night-time evapotranspiration vs. daytime and 24h evapotranspiration
Journal of Hydrology, 1992Abstract The continuous measurement of night-time ETa,n (sunset to sunrise), daytime ETa,d (sunrise to sunset) and 24h ETa,24h alfalfa evapotranspiration was carred out, using the Bowen ratio-energy balance method, in a closed mountainous semi-arid irrigated valley in northern Utah.
openaire +2 more sources