Mapping tree root system in dikes using induced polarization: Focus on the influence of soil water content
2016
Mary, Benjamin | Saracco, Ginette | Peyras, Laurent | Vennetier, Michel | Meriaux, Patrice | Camerlynck, Christian | Centre Européen de Recherche et d'Enseignement des Géosciences de l'Environnement (CEREGE) ; Institut de Recherche pour le Développement (IRD)-Institut National de la Recherche Agronomique (INRA)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) | Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA) | Centre National de la Recherche Scientifique (CNRS) | Milieux Environnementaux, Transferts et Interactions dans les hydrosystèmes et les Sols (METIS) ; École Pratique des Hautes Études (EPHE) ; Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) | ECCOREV, Labex OTmed (no ANR 11-LABX-0061), "Detecine" A*MIDEX projet (no ANR-11-IDEX-0001-02) | CEREGE, IRSTEA, IMBE, Labex OTMed, ECCOREV | ANR-11-IDEX-0001,Amidex,INITIATIVE D'EXCELLENCE AIX MARSEILLE UNIVERSITE(2011) | ANR-11-LABX-0061,OTMed,Objectif Terre : Bassin Méditerranéen(2011)
International audience
اظهر المزيد [+] اقل [-]إنجليزي. In this study, we assessed induced polarization as potential non-destructive method for root detection in dike embankments. We used both laboratory and field experiment to describe the electrical signal with a focus on soil water content. Our objective was to determine in which hydric state of the soil, and related electrical properties, roots could be accurately discriminated. We hypothesized that preferential water zone absorption near the roots could, in some conditions, contribute to locate them. During the laboratory experiments, we compared the response of containers filled with the same homogeneous silty clay bare material, and without (A) or with freshly cut root (B) at different levels of soil water content. Resistivity and phase variations with soil water content indicated that it was preferable to work in dry conditionssince the contrast was higher. Interactions and overlapping between polarization effects of both root and soil made it difficult to interpret first chargeability maps. This led us to study temporal-spatial variations by considering the dynamics of water absorption during a field experiment. High resolution time lapses images showed a correlation between root location and complex resistivity anoma-lies. Although these first results have to be confirmed by further measurements, induced polarization seems to add useful information to interpret anomalies produced by woody roots..
اظهر المزيد [+] اقل [-]الكلمات المفتاحية الخاصة بالمكنز الزراعي (أجروفوك)
المعلومات البيبليوغرافية
تم تزويد هذا السجل من قبل Institut national de la recherche agronomique