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Schornberg, Christina ; Schmidt, Christian ; Kalbus, Edda ; Fleckenstein, Jan:
Simulating the effects of geologic heterogeneity and transient boundary conditions on streambed temperatures — Implications for temperature-based water flux calculations.
In: Advances in Water Resources.
Bd. 33
(2010)
Heft 11
.
- S. 1309-1319.
ISSN 1872-9657
DOI: https://doi.org/10.1016/j.advwatres.2010.04.007
Abstract
Analytical solutions to the one-dimensional heat transport equation for steady-state conditions can providesimple means to quantify groundwater surface water exchange. The errors in exchange flux calculations thatare introduced when the underlying assumptions of homogeneous sediments and constant temperatureboundary conditions are violated were systematically evaluated in a simulation study. Temperatures inheterogeneous sediments were simulated using a numerical model. Heterogeneity in the sediments wasrepresented by discrete, binary geologic units. High contrasts between the hydraulic conductivities (K) of thegeologic units were found to lead to large errors, while the influence of the structural arrangement of theunits was smaller. The effects of transient temperature boundary conditions were investigated using an analytical equation. Errors introduced by transient boundary conditions were small for Darcy-velocities larger 0.1 m/d in the period near maximum and minimum annual surface water temperatures. For smaller fluxes, however, errors can be large. Assuming steady-state conditions and vertical flow in homogeneoussediments is acceptable at certain times of the year and for medium to high exchange fluxes, but pronounced geologic heterogeneity can lead to large errors.
Weitere Angaben
| Publikationsform: | Artikel in einer Zeitschrift |
|---|---|
| Begutachteter Beitrag: | Ja |
| Zusätzliche Informationen: | BAYCEER84267 |
| Institutionen der Universität: | Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften > Lehrstuhl Hydrologie Forschungseinrichtungen > Forschungszentren > Bayreuther Zentrum für Ökologie und Umweltforschung - BayCEER Fakultäten Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften Forschungseinrichtungen Forschungseinrichtungen > Forschungszentren |
| Titel an der UBT entstanden: | Ja |
| Themengebiete aus DDC: | 500 Naturwissenschaften und Mathematik |
| Eingestellt am: | 15 Mai 2015 14:47 |
| Letzte Änderung: | 15 Mai 2015 14:47 |
| URI: | https://eref.uni-bayreuth.de/id/eprint/13701 |