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| Titel |
Diffuse hydrological mass transport through catchments: scenario analysis of coupled physical and biogeochemical uncertainty effects |
| VerfasserIn |
K. Persson, J. Jarsjö, G. Destouni |
| 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 ; 15, no. 10 ; Nr. 15, no. 10 (2011-10-20), S.3195-3206 |
| Datensatznummer |
250012996
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| Publikation (Nr.) |
 copernicus.org/hess-15-3195-2011.pdf |
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| Zusammenfassung |
| This paper quantifies and maps the effects of coupled physical and
biogeochemical variability on diffuse hydrological mass transport through
and from catchments. It further develops a scenario analysis approach and
investigates its applicability for handling uncertainties about both
physical and biogeochemical variability and their different possible
cross-correlation. The approach enables identification of conservative
assumptions, uncertainty ranges, as well as pollutant/nutrient release
locations and situations for which further investigations are most needed in
order to reduce the most important uncertainty effects. The present scenario
results provide different statistical and geographic distributions of
advective travel times for diffuse hydrological mass transport. The
geographic mapping can be used to identify potential hotspot areas with
large mass loading to downstream surface and coastal waters, as well as
their opposite, potential lowest-impact areas within the catchment. Results
for alternative travel time distributions show that neglect or
underestimation of the physical advection variability, and in particular of
those transport pathways with much shorter than average advective solute
travel times, can lead to substantial underestimation of pollutant and
nutrient loads to downstream surface and coastal waters. This is
particularly true for relatively high catchment-characteristic product of
average attenuation rate and average advective travel time, for which mass
delivery would be near zero under assumed transport homogeneity but can be
orders of magnitude higher for variable transport conditions. A scenario of
high advection variability, with a significant fraction of relatively short
travel times, combined with a relevant average biogeochemical mass
attenuation rate, emerges consistently from the present results as a
generally reasonable, conservative assumption for estimating maximum diffuse
mass loading, when the prevailing physical and biogeochemical variability
and cross-correlation are uncertain. |
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