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| Titel |
Phosphorus and dissolved organic carbon export during peak flow periods in three small homogenous catchments in eastern Germany |
| VerfasserIn |
R. Benning, K. Schwärzel, K. H. Feger |
| Konferenz |
EGU General Assembly 2012
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250069906
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| Zusammenfassung |
| Regional climate change scenarios for Central Europe predict both an overall increase in
temperature and alterations in annual precipitation regimes. For large parts of Central Europe,
climate change is expected to result in an increase in winter precipitation and a decrease in
summer precipitation. In addition, an increase in extreme conditions, such as heat waves,
prolonged drought periods, and heavy rainfall events are predicted. This research examines
the potential impacts of increased heavy rainfall events on matter export from small
catchment areas, and how different vegetation cover and land management options effects
these exports.
In order to evaluate the export of matter from different land-use types in the Eastern Ore
Mountains (Saxony, NE Germany, 50Ë 48’18.06” North, 13Ë 36’24.54” East), study sites
were established in three small catchments with homogeneous land-use. These study areas
are each sub-catchments of the Ammelsdorf catchment, which provides inflow to the
Lehnmühle reservoir (a major water supply for the city of Dresden). Each sub catchment
represents one of the three main land-use types in the catchment area of the reservoir: crops
(winter oilseed rape, winter wheat), grasslands, and forests (primarily spruce). Since
November 2009 the discharge from these sub catchments has been continuously
measured and water quality was analyzed on a weekly basis. During peak flow
events, discharge was collected using automatic water samplers, which allowed
for high temporal resolution analysis of matter export during these periods to be
made.
During the 2010 and 2011 hydrological years, several heavy rainfall events occurred
which have been evaluated. During a 110-hour long precipitation event (P = 170 mm)
between 37 and 81 water samples per sub catchment were collected and analyzed. The
resulting export of dissolved phosphorus (ortho-PO4-) and dissolved organic carbon (DOC)
from the sub catchments during this event is provided in the results. In addition, the matter
export resulting from a 59-hour precipitation event (P = 39 mm, between 31 and
48 analyzed water samples per sub catchment) is presented. The contribution of
these two events to the annual export of ortho-PO4- and DOC will be discussed. |
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