Detecting infiltrated water and preferential flow pathways through time-lapse ground-penetrating radar surveys.

Autor: Di Prima S; Agricultural Department, University of Sassari, Viale Italia, 39, 07100 Sassari, Italy; Univ Lyon, Université Claude Bernard Lyon 1, CNRS, ENTPE, UMR 5023 LEHNA, F-69518, Vaulx-en- Velin, France. Electronic address: sdiprima@uniss.it., Winiarski T; Univ Lyon, Université Claude Bernard Lyon 1, CNRS, ENTPE, UMR 5023 LEHNA, F-69518, Vaulx-en- Velin, France., Angulo-Jaramillo R; Univ Lyon, Université Claude Bernard Lyon 1, CNRS, ENTPE, UMR 5023 LEHNA, F-69518, Vaulx-en- Velin, France., Stewart RD; School of Plant and Environmental Sciences, Virginia Polytechnic Institute and State University, Blacksburg, VA, United States of America., Castellini M; Council for Agricultural Research and Economics-Agriculture and Environment Research Center (CREA-AA), Via Celso Ulpiani 5, 70125 Bari, Italy., Abou Najm MR; Department of Land, Air and Water Resources, University of California, Davis, CA 95616, United States., Ventrella D; Council for Agricultural Research and Economics-Agriculture and Environment Research Center (CREA-AA), Via Celso Ulpiani 5, 70125 Bari, Italy., Pirastru M; Agricultural Department, University of Sassari, Viale Italia, 39, 07100 Sassari, Italy., Giadrossich F; Agricultural Department, University of Sassari, Viale Italia, 39, 07100 Sassari, Italy., Capello G; Institute for Agricultural and Earthmoving Machines (IMAMOTER), National Research Council of Italy, 10135 Torino, Strada delle Cacce, 73, Italy., Biddoccu M; Institute for Agricultural and Earthmoving Machines (IMAMOTER), National Research Council of Italy, 10135 Torino, Strada delle Cacce, 73, Italy., Lassabatere L; Univ Lyon, Université Claude Bernard Lyon 1, CNRS, ENTPE, UMR 5023 LEHNA, F-69518, Vaulx-en- Velin, France.
Jazyk: angličtina
Zdroj: The Science of the total environment [Sci Total Environ] 2020 Jul 15; Vol. 726, pp. 138511. Date of Electronic Publication: 2020 Apr 07.
DOI: 10.1016/j.scitotenv.2020.138511
Abstrakt: The objective of this paper was to identify the incidence and extent of preferential flow at two experimental areas located in Lyon, France. We used time-lapse ground-penetrating radar (GPR) surveys in conjunction with automatized single-ring infiltration experiments to create three-dimensional (3D) representations of infiltrated water. In total we established three 100 cm × 100 cm GPR grids and used differenced radargrams from pre- and post-infiltration surveys to detect wetting patterns. The analyzed time-lapse GPR surveys revealed the linkage between nonuniform flow and heterogeneous soil structures and plant roots. At the first experimental area, subsurface coarse gravels acted as capillary barriers that concentrated flow into narrow pathways via funneled flow. At the second experimental area, the interpolated 3D patterns closely matched direct observation of dyed patterns, thereby validating the applied protocol. They also highlighted the important role of plant roots in facilitating preferential water movement through the subsurface. The protocol presented in this study represents a valuable tool for improving the hydraulic characterization of highly heterogeneous soils, while also alleviating some of the excessive experimental efforts currently needed to detect preferential flow pathways in the field.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2020 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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