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Titel (primär) Time-domain reflectometry probing systems for the monitoring of hydrological processes in the unsaturated zone
Autor Kallioras, A.; Khan, A.; Piepenbrink, M.; Pfletschinger, H.; Dietrich, P.; Schüth, C.;
Journal / Serie Hydrogeology Journal
Erscheinungsjahr 2016
Department MET;
Band/Volume 24
Heft 5
Sprache englisch;
POF III (gesamt) T34;
Keywords Time-domain reflectometry (TDR); Groundwater recharge; Unsaturated zone; Dielectric permittivity; Moisture content
UFZ Querschnittsthemen RU5;
Abstract Precise measurements of the downward movement of precipitation through the unsaturated zone, as well as return flow of moisture to the atmosphere via evaporation, have always been challenging in regard to in-situ monitoring techniques. This study investigates the profile of volumetric water-content fluctuations within the unsaturated zone through a combination of field techniques, including in-situ measurements of the volumetric porewater content at different depths using specially designed time-domain reflectometry (TDR) probes. The probes are installed through direct-push vibro-coring methods, at significant depths within the unsaturated zone, providing continuous readings of the soil-moisture content throughout the unsaturated column. The measured waveform is analyzed by using the inverse modeling approach resulting in an apparent relative dielectric permittivity profile of the surrounding medium along the TDR probe length. The approach sufficiently analyzes the mechanisms of water fluxes through significant depths within the unsaturated zone, which in turn can be used to quantify groundwater recharge at areas where the unsaturated zone hydrology plays a key role in the recharge of the underlying aquifers (such as arid and hydrologically sensitive areas). The approach was applied at an experimental field site in the Upper Rhine Valley, Germany.
ID 17426
dauerhafte UFZ-Verlinkung https://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=17426
Kallioras, A., Khan, A., Piepenbrink, M., Pfletschinger, H., Dietrich, P., Schüth, C. (2016):
Time-domain reflectometry probing systems for the monitoring of hydrological processes in the unsaturated zone
Hydrogeol. J. 24 (5), 1297 - 1309