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| Titel |
A hierarchical approach on groundwater-surface water interaction in wetlands along the upper Biebrza River, Poland |
| VerfasserIn |
C. Anibas, B. Verbeiren, K. Buis, J. Chormański, L. Doncker, T. Okruszko, P. Meire, O. Batelaan |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 16, no. 7 ; Nr. 16, no. 7 (2012-07-27), S.2329-2346 |
| Datensatznummer |
250013382
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| Publikation (Nr.) |
 copernicus.org/hess-16-2329-2012.pdf |
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| Zusammenfassung |
As recognized in the European Water Framework Directive, groundwater-dependent wetlands and their diverse ecosystems have important functions
which need to be protected. The vegetation in such habitats is often
dependent on quality, quantity and patterns of river discharge and
groundwater-surface water interaction on a local or reach scale. Since
groundwater-surface water exchange studies on natural rivers and wetlands
with organic soils are scarce, more functional analysis is needed. To this
end we combined different field methods including piezometer nests,
temperature as tracer and seepage meter measurements. Some of these
measurements were used as inputs and/or as validation for the numerical 1-D
heat transport model STRIVE. In transient mode the model was used to
calculate spatially distributed vertical exchange fluxes from temperature
profiles measured at the upper Biebrza River in Poland over a period of nine
months. Time series of estimated fluxes and hydraulic head gradients in the
hyporheic zone were used to estimate the temporal variability of
groundwater-surface water exchange.
This paper presents a hierarchical approach for quantifying and interpreting
groundwater-surface water interaction in space and time. The results for the
upper Biebrza show predominantly upward water fluxes, sections of recharge,
however, exist along the reach. The fluxes depend more on hydraulic gradients
than on riverbed conductivity. This indicates that the fluvio-plain scale is
required for interpreting the exchange fluxes, which are estimated on a local
scale. The paper shows that a conceptual framework is necessary for
understanding the groundwater-surface water interaction processes, where the
exchange fluxes are influenced by local factors like the composition of the
riverbed and the position of the measurement on a local scale, and by regional factors like the
hydrogeology and topography on a fluvio-plain scale. The
hierarchical methodology increases the confidence in the estimated exchange
fluxes and improves the process understanding. The accuracy of the
measurements and related uncertainties, however, remain challenges for wetland
environments. Gaining quantitative information on groundwater-surface water
interaction can improve modeling confidence and as a consequence helps to
develop effective procedures for management and conservation of valuable
groundwater dependent wetlands. |
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