 |
| Titel |
Mean water residence times in the pre-alpine Rietholzbach catchment |
| VerfasserIn |
I. Lehner, S. Bernasconi, S. I. Seneviratne |
| Konferenz |
EGU General Assembly 2009
|
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250023186
|
|
|
|
|
|
| Zusammenfassung |
| The Rietholzbach catchment is a small, hilly pre-alpine basin in the north-eastern part of
Switzerland. Its area is 3.31 km2 and it covers an altitude range between 682 and 950 m.
The area is only sparsely populated and primarily used as pasture land (67 %), on steep
slopes the land use is forest (25 %). A hydrological peculiarity is the congruence of surface
and sub-surface catchment area. In 1975 measurements were initiated to determine and
understand the water balance and its processes.
Isotope measurements of all components of the water cycle started in 1994. The water
samples of precipitation, soil water (discharge of a lysimeter), ground water, and river
water are taken approximately bi-weekly. All samples are prepared by the CO2 gas
equilibration technique and are analysed in terms of the oxygen isotopes by mass
spectrometry.
The samples are taken either at the gauge at the outflow of the catchment or next to the
main measurement site in the upper third of the catchment where an other gauge, three
groundwater wells, the lysimeter and the meteorological sensors are installed in close
vicinity.
Based on these data series this contribution will present estimates of the mean water
residence times in the different components of the catchment. |
|
|
|
|
|
|