Repositorio
Institucional

Galleguillos, Mauricio

Faundez Urbina, Carlos A.

Alanis, Daniel Cabrera

Ramirez, Elizabeth

Seguel, Oscar

Fustos, Ivo J.

Donoso, Pablo Diaz

de Miranda, Jarbas Honorio

Rakonjac, Nikola

Palma, Sebastian Elgueta

Estimating soil water content in a thorny forest ecosystem by time-lapse electrical resistivity tomography (ERT) and HYDRUS 2D/3D simulations

WILEY

HYDROLOGICAL PROCESSES

en

Determination of soil volumetric water content theta in forest ecosystems is particularly challenging due to deep rooting systems and unknown soil vertical and spatial heterogeneity. This research aims to test two undisturbed methods, electrical resistivity tomography (ERT) and HYDRUS 2D/3D, for 2D theta determination in a thorny forest ecosystem. The experiment consisted of infiltrating 10 L of water lasting 60 min. During infiltration, ERT measured apparent resistivity by time-lapse measurements, and theta was measured with an FDR probe (EnviroSCAN) at 33, 63, 83, 97, and 163 cm depth close to the infiltration site. At the end of infiltration, a soil pit was dug, and 100 measurements of theta were performed with a TDR in a 10 x 10 cm regular grid. Archie law transformed soil resistivity (ERT) into theta using manual calibration, verified by an independent dataset. The 2D theta profile obtained by ERT was qualitatively compared with the HYDRUS 2D/3D one. HYDRUS 2D/3D was parametrized with calibrated parameters obtained with HYDRUS 1D using 106 days of theta obtained with EnviroSCAN. The results of HYDRUS 1D calibration and verification were satisfactory, with RMSE and Nash-Sutcliffe coefficients ranging from 0.021 to 0.034 cm(3 )cm(-3) and 0.11 to 0.77, respectively. The forward HYDRUS 2D/3D theta simulation disagrees with EnviroSCAN data for 33 cm depth. However, it follows the trend with near to zero variation of water content at 63 cm depth. Water content determination by ERT was satisfactory with RMSE for calibration and verification of 0.017 and 0.021 cm(3) cm(-3). HYDRUS 2D/3D and ERT comparisons were not equal, with a shallower wetting front by ERT and a deeper one for HYDRUS. Still, both wetting fronts agree with the wetting depth estimated by EnviroSCAN. We conclude that both methods are an alternative for theta determination in heterogeneous and deep soils of forest ecosystems.

2023

artículo original

10.1002/hyp.15002

PDF

applied geophysics

HYDRUS 1D

Vachellia caven

water balance

water transfer models

Recursos hídricos

geofísica aplicada

HIDRO 1D

cueva de Vachellia

balance de agua

modelos de transferencia de agua

artículo original

versión publicada

metadata

metadata

WOS:001082448200001

0885-6087

Recursos hídricos

ANID-FONDAP 1522A000

ANID-FONDECYT 1210932

ANID-FONDECYT 11230533

ANID FONDECYT 11230533

ANID FONDECYT 1210932

ANID FONDAP 1522A000