 |
| Titel |
Influence of aquifer and streambed heterogeneity on the distribution of groundwater discharge |
| VerfasserIn |
E. Kalbus, C Schmidt, J. W. Molson, F. Reinstorf, M. Schirmer |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1027-5606
|
| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 13, no. 1 ; Nr. 13, no. 1 (2009-02-02), S.69-77 |
| Datensatznummer |
250011727
|
| Publikation (Nr.) |
 copernicus.org/hess-13-69-2009.pdf |
|
|
|
|
|
| Zusammenfassung |
| The spatial distribution of groundwater fluxes through a streambed can be
highly variable, most often resulting from a heterogeneous distribution of
aquifer and streambed permeabilities along the flow pathways. Using a
groundwater flow and heat transport model, we defined four scenarios of
aquifer and streambed permeability distributions to simulate and assess the
impact of subsurface heterogeneity on the distribution of groundwater fluxes
through the streambed: (a) a homogeneous low-K streambed within a
heterogeneous aquifer; (b) a heterogeneous streambed within a homogeneous
aquifer; (c) a well connected heterogeneous low-K streambed within a
heterogeneous aquifer; and (d) a poorly connected heterogeneous low-K
streambed within a heterogeneous aquifer. The simulation results were
compared with a base case scenario, in which the streambed had the same
properties as the aquifer, and with observed data. The results indicated that
the aquifer has a stronger influence on the distribution of groundwater
fluxes through the streambed than the streambed itself. However, a
homogeneous low-K streambed, a case often implemented in regional-scale
groundwater flow models, resulted in a strong homogenization of fluxes, which
may have important implications for the estimation of peak mass flows. The
flux distributions simulated with heterogeneous low-K streambeds were
similar to the flux distributions of the base case scenario, despite the
lower permeability. The representation of heterogeneous distributions of
aquifer and streambed properties in the model has been proven to be
beneficial for the accuracy of flow simulations. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|