3 edition of Methods for estimating evapotranspiration. found in the catalog.
Methods for estimating evapotranspiration.
Irrigation and Drainage Specialty Conference Las Vegas 1966.
by American Society of Civil Engineers, United Engineering Center in New York
Written in English
|Contributions||American Society of Civil Engineers. Irrigation and Drainage Division.|
|LC Classifications||SB112 .I75 1966r|
|The Physical Object|
|Number of Pages||236|
|LC Control Number||67001538|
The origin of evapotranspiration microclimatology as known to-day, goes back to when Dalton first proposed a mass transport equation for estimating evaporation. Since then, many methods have been proposed for estimating evapotranspiration. Clearly, a review . The problems which characterize the study of evapotranspiration are briefly discussed. Different models which have been used for estimating evapotranspiration are reviewed. They include the eddy correlation model, mass transport model, aerodynamic model, Penman-resistance model and the energy balance model. The utilization of remote sensing for regional evapotranspiration estimation is Cited by: 6.
It is hoped that this thesis helps to provide a greater insight into the evaluation of reference evapotranspiration estimation methods, development of regression and Artificial Neural Network models and derivation of crop coefficients and, the results of the present investigation would be more useful for the reference evapotranspiration and. The book is a thorough presentation of theoretical and applied aspects of the evaporation and evapotranspiration process supported by data from experimental studies. It is written in a way that the theoretical background of evaporation and evapotranspiration estimation is presented in a simplified manner, comprehensive to most technical readers.
The Penman method is considered as one of the most reliable methods for estimating lake evaporation and is discussed in sufficient detail in the chapter. Besides estimating the evaporation loss from reservoirs, estimation of reference crop evapotranspiration or potential evapotranspiration is also required, which forms the basis of estimating. The relation of evapotranspiration to climatic factors, geographic location, and vegetative cover has been studied by many hydrologists and has led to the development of various methods for estimating potential evapotranspiration. Most of the methods are based on em pirical formulas. These formulas contain one or more climatologicalCited by:
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Another method of estimating evapotranspiration is the mass transfer method. This approach considers the vertical movement of small parcels of air (eddies) above a large homogeneous surface. The eddies transport material (water vapour) and energy (heat, momentum). Estimating Potential Evapotranspiration.
Increasing population and needs for an augmented food supply give greater importance to improved procedures for estimating agricultural water requirements both for irrigation and for rain-fed agriculture.
Four methods for estimating potential evapotranspiration are compared and evaluated. These are the Class A evaporation pan located in an irrigated Cited by: Evapotranspiration Equations • A number of methods are available to estimate the potential evapotranspiration (PET) using climatological data • These formulae range from those backed by theoretical concepts to purely empirical methods.
Evaporation, Evapotranspiration, and Irrigation Water Requirements is a comprehensive reference to estimating the water quantities needed for irrigation of crops based upon the physics of evaporation and evapotranspiration (ET).
This new edition of which updates and expands the original, provides improved and standardized methods. Get this from a library. Methods for estimating evapotranspiration. [American Society of Civil Engineers.
Irrigation and Drainage Division.;]. difficulty in the selection of the most suitable evapotranspiration methods is discussed. Finally, this paper points out the prospective development trends of the evapotranspiration estimating.
Water-Resources Investigations Report Estimates of Evapotranspiration from the Ruby Lake National Wildlife Refuge Area, Ruby Valley, Northeastern Nevada, May October METHODS OF ESTIMATING EVAPOTRANSPIRATION. Evapotranspiration (ET) is a major component of the water cycle, which makes it an integral part of water resources management, especially in arid and semiarid environments.
ET data are used for water management, irrigation scheduling, various modeling activities, and much more. Some areas of scarce water resources place limitations on water use, which are typically determined from various Author: Jerry E. Moorhead. has become the de facto standard for estimating reference evapotranspiration (ETo), it is a com- plex method requiring several weather parame- ters.
Required weather data are oftentimes un- available, and alternative methods must be used. Three alternative ETo methods, the FAO Re- duced Set, Hargreaves, and Turc methods, wereFile Size: KB. Evapotranspiration Methods for Regional Use in the South-Eastern United States.
Journal of the American Water Resources Association, Vol. 41(3), pp. Makkink, G.F. Methods of estimating evapotranspiration fall within three general categories: direct and indirect methods, and simulation models of the soil water balance.
This chapter reviews the current state of knowledge in each of these areas and the limitations in each by: – And lastly vegetation index methods,orinference methods based on the use of remote sensing to compute a reduction factor (such as Kc or Priestley Taylor-alpha parameters) for the estimation of the actual evapotranspira-tion.
These approaches consider a potential or reference ET obtained from ground measurements. Get this from a library. A comparison of methods of estimating potential evapotranspiration from climatological data in arid and subhumid environments.
[R W Cruff; T H Thompson; Geological Survey (U.S.),; California. Department of Water Resources.]. Abstract. Contemporary methods of evapotranspiration estimation are described in detail, along with transpiration and evaporation.
Measurement of evapotranspiration by lysimeters (from bare soil or soil with a canopy) and measurement of evaporation from a water table are by: 5. Estimating evaporation from shallow water bodies using energy balance or combination methods also requires estimating energy storage and release.
Edlinger et al. () introduced the concept of equilibrium temperature for estimating energy storage, Qt, (equivalent to the term GFile Size: KB.
This research focused on estimating evapotranspiration (i.e., the amount of water vaporizing into the atmosphere through processes of surface evaporation and plant transpiration) under both theoretical and actual conditions. There were two study areas involved: one, on a large scale where agriculturally-representative, electronic weather stations were used to evaluate the drivers and Author: Clayton S.
Lewis. Empirical Methods of Estimating or Predicting Evapotranspiration Using Radiation rase d P REDICTIONS of evapotranspiration are basic parameters for the engi-neer or agronomist involved in plan-ning and developing water resources.
Estimates of evapotranspiration are also used extensively in assessing the irriga-tion water-management efficiency Cited by: Dominant crop and environmental conditions need to be considered to obtain accurate estimates of Et for a specific crop.
Meteorological conditions determine the evaporative demand while the crop canopy and soil moisture conditions determine the extent to which that demand will be met. Evapotranspiration for a particular crop can be estimated if measurements or estimates of a potential or Cited by: 2.
Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Civil and Sanitary Engineering, Cited by:. Another method for estimating evapotranspiration is to carry out an atmospheric water balance in a vertical column overlying the area of interest.
In this method, evapotranspiration is set equal to the sum of precipitation and change in water vapor content of the column, less the .Evapotranspiration (ET) is the sum of evaporation and plant transpiration from the Earth's land and ocean surface to the ation accounts for the movement of water to the air from sources such as the soil, canopy interception, and iration accounts for the movement of water within a plant and the subsequent loss of water as vapor through stomata in its leaves.Potential evapotranspiration estimation methods Potential evapotranspiration is an important input in hydrological cycle simulations.
There are many kinds of potential evapotranspiration estimation methods; however, the use of different methods to estimate potential evapotranspiration influences the .