 |
| Titel |
An integrated approach to assess hydrological processes and sediment dynamics in Northern Tanzania |
| VerfasserIn |
Geraldine Quénéhervé, Michael Märker |
| Konferenz |
EGU General Assembly 2011
|
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250045489
|
|
|
|
|
|
| Zusammenfassung |
| Semi-arid environments such as in Northern Tanzania are characterized by a variety of
degradation processes due to long dry periods and extreme rainfall events. In this study, we
present an integrated modelling approach to assess the relevant hydrological processes and
the related sediment dynamics. The study area is drained by the Makuyuni River which is
flowing into Lake Manyara, Monduli District, Northern Tanzania.
Based on satellite data we derived information about topography, vegetation and land use
as well as on mineral composition, soils and stratigraphic details. Moreover, we utilized non
invasive techniques such as induced electric susceptibility, colour meters and minimal
invasive methods like overland flow detectors and hood infiltrometers to estimate soil
hydrological characteristics and overland flow generation dynamics. Soil physical
characteristics were also analysed on typical soil profiles to get the respective calibration
data. Based on this analysis, we deduced functional morpho-hydrological units as
modelling entities. Specific sediment sources such as surface wash, gullies and rills
were detected by remote sensing and modelled separately. Finally a connectivity
index driven sediment routing was applied to transport the sediments down the river
network.
We depict the methodology to set up and the structure of the integrated model and its
calibration validation. In conclusion, we conduct first future climate scenarios to test the
robustness of the modelling approach. |
|
|
|
|
|
|