2024-03-28T14:22:47Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/1266362017-10-20T07:06:31Zcom_10261_75com_10261_6col_10261_454
A theoretical analysis to estimate the hydraulic properties of a loam soil from a capillary-overpressure-evaporation process employing the HYDRUS 2D model
Peña-Sancho, Carolina
Ghezzehei, Teamrat A.
Latorre Garcés, Borja
Moret-Fernández, David
Ministerio de Ciencia e Innovación (España)
The determination of the water retention curve (WRC) parameters and the hydraulic conductivity (K) is of
paramount importance in many scientific fields such as hydrology or environmental science. Their direct characterization,
however, is typically cumbersome and time consuming. This work analyze the viability to estimate
the α and n Van Genuchten (VG) WRC parameters and K from following processes: a capillary wetting process
at saturation, an evaporation process and a capillary wetting at saturation followed by an evaporation process.
The theoretical analysis was carried out on a 5 cm high and 5 cm diameter cylinder filled with loam soil using
numerically generated data with the HYDRUS 2D code. The error maps for the above mentioned processes and
the n-K, α-n and K-α planes were generated from the RMSE calculated between the original and the simulated
cumulative curves. The deviation (%) between the optimal and original hydraulic parameters was also calculated.
Results showed that the capillary plus evaporation method applied on the n-K and α-n planes was the unique process
that allowed a unique and well defined minimum. For this last case, the deviation for the α and n parameter
were 6’67 and 0’88%, respectively. Taking into account that K can be easy measured from the same soil cylinder
by means of Darcy’s law, we conclude the capillary + evaporation process can be a simple and effective alternative
to estimate the WRC parameters. To this end, the hysteresis phenomena due to the wetting-evaporation process
should be taking into account.
2015
póster de congreso
EGU General Assembly (2015)
Geophysical Research Abstracts 17: EGU2015-6145 (2015)
http://hdl.handle.net/10261/126636
http://dx.doi.org/10.13039/501100004837
eng
Sí
http://creativecommons.org/licenses/by/3.0/es/
openAccess