Print Email Facebook Twitter Mapping variability of soil water content and flux across 1–1000 m scales using the Actively Heated Fiber Optic method Title Mapping variability of soil water content and flux across 1–1000 m scales using the Actively Heated Fiber Optic method Author Sayde, C. Buelga, J.B. Rodriguez-Sinobas, L. El Khoury, L. English, M. Van de Giesen, N.C. Selker, J.S. Faculty Civil Engineering and Geosciences Department Water Management Date 2014-09-16 Abstract The Actively Heated Fiber Optic (AHFO) method is shown to be capable of measuring soil water content several times per hour at 0.25 m spacing along cables of multiple kilometers in length. AHFO is based on distributed temperature sensing (DTS) observation of the heating and cooling of a buried fiber-optic cable resulting from an electrical impulse of energy delivered from the steel cable jacket. The results presented were collected from 750 m of cable buried in three 240 m colocated transects at 30, 60, and 90 cm depths in an agricultural field under center pivot irrigation. The calibration curve relating soil water content to the thermal response of the soil to a heat pulse of 10 W m?1 for 1 min duration was developed in the lab. This calibration was found applicable to the 30 and 60 cm depth cables, while the 90 cm depth cable illustrated the challenges presented by soil heterogeneity for this technique. This method was used to map with high resolution the variability of soil water content and fluxes induced by the nonuniformity of water application at the surface. Subject soil moisturewaterDTSfiber opticssoil water fluxirrigation To reference this document use: http://resolver.tudelft.nl/uuid:3e5b76d2-433c-4228-90b2-6410207b48ee DOI https://doi.org/10.1002/2013WR014983 Publisher American Geophysical Union Embargo date 2015-03-16 ISSN 0043-1397 Source Water Resources Research, 50 (9), 2014 Part of collection Institutional Repository Document type journal article Rights (c) 2014 American Geophysical Union Files PDF vandeGiesen_2014.pdf 6.15 MB Close viewer /islandora/object/uuid:3e5b76d2-433c-4228-90b2-6410207b48ee/datastream/OBJ/view