# Calculation of Steady-State Evaporation for an Arbitrary Matric Potential at Ground Surface

 dc.contributor Zhan, Hongbin dc.creator Liu, Xin dc.date.accessioned 2016-12-01T06:36:18Z dc.date.accessioned 2017-04-07T20:15:39Z dc.date.available 2016-12-01T06:36:18Z dc.date.available 2017-04-07T20:15:39Z dc.date.created 2014-12 dc.date.issued 2014-12-15 dc.description.abstract In the past few decades, many researchers have studied evaporation from soil columns in the presence of a water table. Several water retention functions have been developed to describe the water flow behavior in the field environment. While most studies involving these functions focus on analysis of water flow and solute transport in variably saturated porous media, there is a limited amount of research to estimate the evaporation rate at bare ground surface for an arbitrary matric potential head. In previous studies, Jury and Horton proposed a method of calculating the potential evaporation rate above a water table on the basis of the Haverkamp unsaturated hydraulic conductivity equation and an assumption that the potential evaporation rate is much less than the saturated hydraulic conductivity of the soil. In this thesis, I developed a new method to estimate the evaporation rate for an arbitrary matric potential head at bare soil surface. I also presented two programs to calculate evaporation rates for a wide range of depths and the fitting parameters of the Haverkamp equation. The results show that the evaporation rates calculated by this thesis fit well with the experimental data and can reproduce the result of potential evaporation rate calculated from previous equation under the special condition of an infinite matric potential head at bare soil surface. dc.identifier.uri http://hdl.handle.net/1969.1/154135 dc.language.iso en dc.subject Bare soil evaporation dc.subject Haverkamp model dc.subject Brooks-Corey model dc.title Calculation of Steady-State Evaporation for an Arbitrary Matric Potential at Ground Surface dc.type Thesis