Validating coupled flow theory for bare-soil evaporation under different boundary conditions

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60460709%3A41330%2F23%3A97752" target="_blank" >RIV/60460709:41330/23:97752 - isvavai.cz</a>

Result on the web

<a href="http://dx.doi.org/10.1002/vzj2.20277" target="_blank" >http://dx.doi.org/10.1002/vzj2.20277</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1002/vzj2.20277" target="_blank" >10.1002/vzj2.20277</a>

Result language

angličtina

Original language name

Validating coupled flow theory for bare-soil evaporation under different boundary conditions

Original language description

Evaporation from bare soil is an important hydrological process and part of the water and energy balance of terrestrial systems. Modeling bare-soil evaporation is challenging, mainly due to nonlinear couplings among liquid water, water vapor, and heat fluxes. Model concepts of varying complexity have been proposed for predicting evaporative water and energy fluxes. Our aim was to test a standard model of coupled water, vapor, and heat flow in the soil using data from laboratory evaporation experiments under different boundary conditions. We conducted evaporation experiments with a sand and a silt loam soil and with three different atmospheric boundary conditions: (i) wind, (ii) wind and short-wave radiation, and (iii) wind and intermittent short-wave radiation. The packed soil columns were closed at the bottom (no water flux) and instrumented with temperature sensors, tensiometers, and relative humidity probes. We simulated the evaporation experiments with a coupled water, vapor, and heat flow model, which solves the surface energy balance and predicts the evaporation rate. The evaporation dynamics were predicted very well, in particular the onset of stage-two evaporation and the evaporation rates during the stage. A continuous slow decrease of the measured evaporation rate during stage-one could not be described with a constant aerodynamic resistance. Adding established soil resistance parametrizations to the model significantly degraded model performance. The use of a boundary-layer resistance, which takes into account the effect of point sources of moisture, improved the prediction of evaporation rates for the sandy soil, but not for the silt loam. Evaporation experiments under different atmospheric conditions were modeled with coupled water-vapor-heat flow.Model predicted evaporation dynamics well, but slightly falling rates during stage-one could not be modeled.Parameterization of soil hydraulic properties accounts for sorbed water and film flow.Unjustified empirical soil resistance parameterizations degraded model performance.Use of a boundary-layer resistance described the decrease during stage-one for sand, but not for loam.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10511 - Environmental sciences (social aspects to be 5.7)

Project

—

Continuities

S - Specificky vyzkum na vysokych skolach

Publication year

2023

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Vadose Zone Journal

ISSN

1539-1663

e-ISSN

1539-1663

Volume of the periodical

22

Issue of the periodical within the volume

6

Country of publishing house

US - UNITED STATES

Number of pages

17

Pages from-to

1-17

UT code for WoS article

001074445900001

EID of the result in the Scopus database

2-s2.0-85173520944