Comparison among monitoring strategies to assess water flow dynamic and soil hydraulic properties in agricultural soils

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Title: Comparison among monitoring strategies to assess water flow dynamic and soil hydraulic properties in agricultural soils
Authors: Valdes-Abellan, Javier | Jiménez-Martínez, Joaquín | Candela, Lucila | Tamoh, Karim
Research Group/s: Ingeniería del Terreno y sus Estructuras (InTerEs)
Center, Department or Service: Universidad de Alicante. Departamento de Ingeniería Civil
Keywords: Water management | Hydrus | Inverse approach | Water flux
Knowledge Area: Ingeniería Hidráulica
Issue Date: Mar-2015
Publisher: Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria (INIA)
Citation: Valdes-Abellan, J.; Jiménez-Martínez, J.; Candela, L.; Tamoh, K. (2015). Comparison between monitoring strategies to assess water flow dynamic and soil hydraulic properties in agricultural soils. Spanish Journal of Agricultural Research, Volume 13, Issue 1, e12-001, 15 pages.
Abstract: Irrigated agriculture is usually performed in semi-arid regions despite scarcity of water resources. Therefore, optimal irrigation management by monitoring the soil is essential, and assessing soil hydraulic properties and water flow dynamics is presented as a first measure. For this purpose, the control of volumetric water content, θ, and pressure head, h, is required. This study adopted two types of monitoring strategies in the same experimental plot to control θ and h in the vadose zone: i) non-automatic and more time-consuming; ii) automatic connected to a datalogger. Water flux was modelled with Hydrus-1D using the data collected from both acquisition strategies independently (3820 daily values for the automatic; less than 1000 for the non-automatic). Goodness-of-fit results reported a better adjustment in case of automatic sensors. Both model outputs adequately predicted the general trend of θ and h, but with slight differences in computed annual drainage (711 mm and 774 mm). Soil hydraulic properties were inversely estimated from both data acquisition systems. Major differences were obtained in the saturated volumetric water content, θs, and the n and α van Genuchten model shape parameters. Saturated hydraulic conductivity, Ks, shown lower variability with a coefficient of variation range from 0.13 to 0.24 for the soil layers defined. Soil hydraulic properties were better assessed through automatic data acquisition as data variability was lower and accuracy was higher.
Sponsor: Projects: CONSOLIDER-TRAGUA; CGL2010-22168-C03-02/BTE and CGL2013-48802-C3-3-R (Spanish Ministry of Science and Innovation).
ISSN: 1695-971X | 2171-9292 (Internet)
DOI: 10.5424/sjar/2015131-6323
Language: eng
Type: info:eu-repo/semantics/article
Rights: © 2015 INIA. This is an open access article distributed under the Creative Commons Attribution License (CC by 3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Peer Review: si
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INV - IngHA - Artículos de Revistas

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