caa a22 4500 445814446 CHVBK 20180317145221.0 cr unu---uuuuu 170323e20110201xx s 000 0 eng 10.1007/s10040-010-0657-2 doi (NATIONALLICENCE)springer-10.1007/s10040-010-0657-2 Saar Martin Department of Geology and Geophysics, University of Minnesota, 310 Pillsbury Dr. SE, 55455, Minneapolis, MN, USA aut Review: Geothermal heat as a tracer of large-scale groundwater flow and as a means to determine permeability fields [Elektronische Daten] [Martin Saar] Revue: La chaleur géothermique en tant que traceur des écoulements souterrains à grande échelle et moyen de caractériser des champs de perméabilité Revisión: El calor geotérmico como un trazador del flujo a gran escala de agua subterránea y como un medio para determinar campos de permeabilidad 综述: 地热热量做为大尺度地下水流的示踪剂以确定渗透率场 Revisão: Calor geotérmico como traçador de escoamentos subterrâneos em larga escala e como meio de determinação de campos de permeabilidade A review of coupled groundwater and heat transfer theory is followed by an introduction to geothermal measurement techniques. Thereafter, temperature-depth profiles (geotherms) and heat discharge at springs to infer hydraulic parameters and processes are discussed. Several studies included in this review state that minimum permeabilities of approximately 5 × 10−17 < k min <10−15m2 are required to observe advective heat transfer and resultant geotherm perturbations. Permeabilities below k min tend to cause heat-conduction-dominated systems, precluding inversion of temperature fields for groundwater flow patterns and constraint of permeabilities other than being <k min. Values of k min depend on the flow-domain aspect-ratio, faults and other heterogeneities, anisotropy of hydraulic and thermal parameters, heat-flow rates, and the water-table shape. However, the k min range is narrow and located toward the lower third of geologic materials, which exhibit permeabilities of 10−21 < k < 10−7m2. Therefore, a wide range of permeabilities can be investigated by analyzing subsurface temperatures or heat discharge at springs. Furthermore, temperature is easy and economical to measure and because thermal material properties vary far less than hydraulic properties, temperature measurements tend to provide better-constrained groundwater flow and permeability estimates. Aside from hydrogeologic insights, constraint of advective/conductive heat transfer can also provide information on magmatic intrusions, metamorphism, ore deposits, climate variability, and geothermal energy. Springer-Verlag, 2010 Review nationallicence Geothermal nationallicence Heat nationallicence Tracer nationallicence USA nationallicence Hydrogeology Journal Springer-Verlag 19/1(2011-02-01), 31-52 1431-2174 19:1<31 2011 19 10040 https://doi.org/10.1007/s10040-010-0657-2 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10040-010-0657-2 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Saar Martin Department of Geology and Geophysics, University of Minnesota, 310 Pillsbury Dr. SE, 55455, Minneapolis, MN, USA aut NATIONALLICENCE 773 0- Hydrogeology Journal Springer-Verlag 19/1(2011-02-01), 31-52 1431-2174 19:1<31 2011 19 10040 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer