|Series||Scientific series (Canada. Inland Waters Directorate) -- 17|
|Contributions||Jackson, Richard E.|
Evapotranspiration is the process that transfers water. from land surface to the atmosphere and occurs as evaporation (or sublimation when below freezing) from open water, soil, and plant canopies, and as transpiration from : Michael T. Moreo, Brian J. Andraski, C. Amanda Garcia. Evapotranspiration occurs in the zones where groundwater is too close to the surface. These zones are known as wetlands. Water may not be emanating or the terrain may not be wet, but the water table is located high enough for plant's roots to be able to consume groundwater. The evapotranspiration is set equal to the sum of storage change plus groundwater recharge. The former is represented by the variation of the groundwater level, while the latter is derived from the water level behavior at night. Both quantities are multiplied by the specific yield (or drainable porosity), which serves as a conversion by: In arid and semi-arid regions, an alarming amount of groundwater is evapotranspirated by crops in irrigated areas or phreatophytes along river valleys due to shallow groundwater tables. Groundwater evapotranspiration does not only reduce available water resources and thus water use efficiency, but also cause soil salt accumulation.
A comparative study of groundwater evapotranspiration functions. A comparative study of groundwater the full power of the method is overlooked and very few books . Groundwater evapotranspiration estimation based on the modeling and WTF methods may be considered the simplest, easiest, and least expensive technique available but the method involves a number of sources of uncertainty (Soylu et al., ). In addition, a reliable quantification of actual evapotranspiration requires a comprehensive investigation that combines the . Here, evapotranspiration is defined as the water lost to the atmosphere from the ground surface, evaporation from the capillary fringe of the groundwater table, and the transpiration of groundwater by plants whose roots tap the capillary fringe of the groundwater table. The banner at the top of this page offers an even more simple definition. This chapter discusses the reduction in transpiration induced by soil moisture stress or soil water salinity. The resulting evapotranspiration will deviate from the crop evapotranspiration under standard conditions. The evapotranspiration is computed by using a water stress coefficient, K s, describing the effect of water stress on crop transpiration.
Evapotranspiration generally constitutes the second largest component of the water budget, after precipitation. Groundwater ET, caused primarily by deep-rooted phreatophytes, is a significant component of groundwater discharge for many aquifers. Phreatophyte is defined as aFile Size: 3MB. Water table dynamics are linked to the atmosphere through evapotranspiration and recharge. The assimilation of observed evapotranspiration values should thus improve groundwater model results. This paper presents a method for assimilating evapotranspiration data into a coupled unsaturated zone and groundwater model using the ensemble Kalman : Simone Gelsinari, Simone Gelsinari, Rebecca Doble, Edoardo Daly, Valentijn R.N. Pauwels. Evapotranspiration of groundwater: a time series analysis of the hydrologic regimen of a groundwater discharge area. Ground-Water Discharge Dete rmined from Measurements of Evapotranspiration, Other Available Hydrologic Components, and Shallow Water-Level Changes, Oasis Valley, Nye County, Nevada Water-Resources Investigations Report Prepared in cooperation with the OFFICE OF ENVIRONMENTAL RESTORATION AND WASTE MANAGEMENT U..S. .