Evaporation Through a Dry Soil Layer: Column Experiments
نویسندگان
چکیده
Modeling of water vapor transport through a dry soil layer (DSL), typically formed in the top during seasons arid and semi-arid areas, is still problematic. Previous laboratory experiments controlled environments showed that only process DSL by Fick's law diffusion. However, field exhibited consistently higher evaporation rates than predicted diffusion flow only. Some proposed reasons for mismatch were: (a) daily cycles condensation due to changes solar radiation; (b) wind effects on air movement DSL; (c) atmospheric pressure fluctuations; (d) nonlinear influence thickness process. To link with observations, we performed column thick (>50 cm) DSL, different speeds, two radiative lamp schedules (continuous 12 h cycles) thicknesses DSL. Atmospheric pressure, temperature humidity were measured continuously. The results show observed are larger those We found it was possible model as function fluctuations. In conclusion, fluctuations can induce estimated only, possibly explaining discrepancy between rates.
منابع مشابه
Simulation of Darcian evaporation through a heterogeneous soil layer
Steady, Darcian, 1-D, 1-phase evaporation through a vertically inhomogeneous soil from a horizontal water table is simulated as an optimal control problem, i.e. the hydraulic properties of the porous medium (relative permeability of moisture and capillary water retention curve) are considered as control functions. The Richards nonlinear ordinary differential equation is integrated twice as a bo...
متن کاملContaminant Transport through Initially Dry Soil
Horizontal contaminant transport through unsaturated soil been demonstrated both analytically and experimentally. The water and solute transport equations were solved using the Boltzman transformation, to convert the partial differential equations to ordinary differential equations. The resulted mathematical model was verified using experimental data. A laboratory scale column system was constr...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Water Resources Research
سال: 2021
ISSN: ['0043-1397', '1944-7973']
DOI: https://doi.org/10.1029/2020wr028286