Aminzadeh Milad, Or Dani (2017), Pore-scale study of thermal fields during evaporation from drying porous surfaces, in International Journal of Heat and Mass Transfer
Aminzadeh Milad, Roderick Michael, Or Dani (2016), A generalized complementary relationship between actual and potential evaporation defined by a reference surface temperature, in Water Resources Research
Lehmann Peter, Or Dani (2015), Effects of stomata clustering on leaf gas exchange, in New Phytologist
, 207(4), 1015-1025.
Haghighi Erfan, Or Dani (2015), Evaporation from wavy porous surfaces into turbulent airflows, in Transport in Porous Media
Haghighi Erfan, Or Dani (2015), Interactions of bluff-body obstacles with turbulent airflows affecting evaporative fluxes from porous surfaces, in Journal of Hydrology
Haghighi Erfan, Or Dani (2015), Linking evaporative fluxes from bare soils across surface viscous sublayer with the Monin-Obukhov atmospheric flux-profile estimates, in Journal of Hydrology
, 525, 684-693.
Haghighi Erfan, Or Dani (2015), Thermal signatures of turbulent airflows interacting with evaporating thin porous surfaces, in International Journal of Heat and Mass Transfer
Haghighi Erfan, Or Dani (2015), Turbulence-induced thermal signatures over evaporating bare soil surfaces, in Geophysical Research Letters
, 42, 5325-5336.
Aminzadeh Milad, Or Dani (2014), Energy partition dynamics of drying terrestrial surfaces, in Journal of Hydrology
, 519, 1257-1270.
Or Dani, Lehmann Peter, Shahraeeni Ebrahim, Shokri Nima (2013), Advances in soil evaporation physics - a review, in Vadose Zone Journal
, 12, 1-16.
Lehmann Peter, Or Dani (2013), Effect of wetness patchiness on evaporation dynamics from drying porous surface, in Water Resources Research
, 49, 8250-8262.
Haghighi Erfan, Or Dani (2013), Evaporation from porous surfaces into turbulent airflows: Coupling eddy characteristics with pore scale vapor diffusion, in Water Resources Research
, 49, 8432-8442.
Haghighi Erfan, Shahraeeni Ebrahim, Lehmann Peter, Or Dani (2013), Evaporation rates across a convective air boundary layer are dominated by diffusion, in Water Resources Reserach
, 49, 1602-1610.
Aminzadeh Milad, Or Dani (2013), Temperature dynamics during nonisothermal evaporation from drying porous surfaces, in Water Resources Research
, 49, 7339-7349.
Evaporation rates and patterns affect energy balance of terrestrial surfaces and drive the hydrologic cycle. Evaporative losses define plant physiological function through transpiration, and affect available water for plants and microorganisms inhabiting the soil. Notwithstanding the prominence of evaporative drying for many natural and engineering applications, prediction of drying rates from porous media remain a challenge due to interactions between energy and atmospheric conditions (radiation, humidity, temperature, air velocity) and porous medium properties often resulting in abrupt transitions and complex dynamics. The working hypothesis is that through proper integration of porous medium small-scale physical processes (elucidated in the previous SNSF project) affecting phase continuity, gradients and flows, and surface wetness dynamics, the prediction of evaporation patterns and fluxes at larger scales would be improved. Additionally, emergent and unaccounted-for phenomena such as surface topography and heterogeneity-enhanced evaporative losses would be considered at operational hydrologic scales. The objective is to quantify the role of porous media properties and processes in large scale evaporative losses using model-based upscaling schemes guided by experiments. We envision two primary lines of research supporting two PhD projects. One would focus on theory, laboratory and field experiments to quantify effects of soil textural heterogeneity that are hypothesized to enhance evaporative losses at field scale, and a related topic of evaporation from sloping surfaces to assess whether surface topography significantly affects evaporative losses (relative to flat surfaces). The other PhD student would focus on an important yet understudied role of surface wetness on rates of vapor transfer from wet pores across atmospheric viscous sub-layer (next to surface) using combination of modeling, wind tunnel experiments, and detailed field studies. Both PhD projects are ultimately aimed at upscaling and deriving parameterization schemes for hydrologic modeling at field scale. In collaboration with colleagues in Jülich we plan to combine dielectric (radar, radiometer, TDR) measurements of surface water content with thermal imagery at field scale to directly quantify evaporation rates from texturally heterogeneous soil surfaces under natural conditions. Results of this project are expected to provide data and upscaling schemes for bridging the gap between porous medium controls at laboratory and field scales and would provide the physical basis for: (i) quantifying coupling between soil and atmosphere (mass and energy fluxes); (ii) account for processes controlling spatio-temporal patterns of evaporative losses (heterogeneity and topography); and (iii) develop physically-based boundary conditions for operational hydrologic and climatic continuum models. Derivation of large scale parameterization with process-based boundary conditions linking soil with atmosphere and surface energy would be particularly important for models predicting processes under future climate change scenarios in which soil surface interactions are known to play a critical role.