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| Titel |
A generalized Damköhler number for classifying material processing in hydrological systems |
| VerfasserIn |
C. E. Oldham, D. E. Farrow, S. Peiffer |
| 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 ; 17, no. 3 ; Nr. 17, no. 3 (2013-03-15), S.1133-1148 |
| Datensatznummer |
250018828
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| Publikation (Nr.) |
 copernicus.org/hess-17-1133-2013.pdf |
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| Zusammenfassung |
| Assessing the potential for transfer of pollutants and nutrients across
catchments is of primary importance under changing land use and climate.
Over the past decade the connectivity/disconnectivity dynamic of a catchment
has been related to its potential to export material; however, we continue to
use multiple definitions of connectivity, and most have focused strongly on
physical (hydrological or hydraulic) connectivity. In contrast, this paper
constantly focuses on the dynamic balance between transport and material
transformation, and defines material connectivity as the effective transfer
of material between elements of the hydrological cycle. The concept of
exposure timescales is developed and used to define three distinct regimes:
(i) which is hydrologically connected and transport is dominated by advection;
(ii) which is hydrologically connected and transport is dominated by
diffusion; and (iii) which is materially isolated. The ratio of exposure
timescales to material processing timescales is presented as the
non-dimensional number, NE, where NE is reaction-specific and allows
estimation of relevant spatial scales over which the reactions of interest
take place. Case studies within each regime provide examples of how
NE can be used to characterise systems according to their sensitivity to
shifts in hydrology and gain insight into the biogeochemical processes that
are signficant under the specified conditions. Finally, we explore the
implications of the NE framework for improved water management, and for
our understanding of biodiversity, resilience and chemical competitiveness
under specified conditions. |
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