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Simulating the effects of geologic heterogeneity and transient boundary conditions on streambed temperatures — Implications for temperature-based water flux calculations

Title data

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. Vol. 33 (2010) Issue 11 . - pp. 1309-1319.
ISSN 1872-9657
DOI: https://doi.org/10.1016/j.advwatres.2010.04.007

Abstract in another language

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.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BAYCEER84267
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Chair Hydrology
Research Institutions > Research Centres > Bayreuth Center of Ecology and Environmental Research- BayCEER
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences
Research Institutions
Research Institutions > Research Centres
Result of work at the UBT: Yes
DDC Subjects: 500 Science
Date Deposited: 15 May 2015 14:47
Last Modified: 15 May 2015 14:47
URI: https://eref.uni-bayreuth.de/id/eprint/13701