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Annika Künne

Hydrological Modeling and Regionalization of the Guapi-Macacu River Basin (Brazil)

The Brazilian Atlantic rainforest (Mata Atlântica) is one of the world’s biodiversity hotspots (Myers et al. 2000). After the Portuguese colonization, its original expansion of 1.5 million km² was reduced to only 7% (Galindo- Leal & De Gusmão Câmara 2003). Forest fragmentation, overexploitation and soil degradation has increased the pressure on water resources in the region. The Guapi-Macacu River Basin (GMRB, 1,265 km²) lies in the state of Rio de Janeiro (Brazil) within the Atlantic rainforest in the north east of the growing metropolitan area of Rio de Janeiro and Niterói. The river basin provides 2.5 million people with drinking water. Climatically the region possesses distinctive rain and dry periods, whereas extreme precipitation events in the rainy season cause floods and landslides and dry periods can lead to water shortages, especially in the agricultural and domestic supply sectors.

To ensure both, the protection of the remnants of Atlantic forest biome as well as domestic, agricultural and industrial water supply a hydrological understanding of the sparse gauged region is essential.

To quantify differences in the water household of most relevant land use distributions (i.e. rainforest, pasture and arable land) in the GMRB, 4 sub-watersheds with different land use distributions were selected and a hydro-climatic monitoring network implemented, measuring discharge, meteorological variables and soil moisture in a high temporal resolution. The collected data as well as acquired secondary data were used as hydro-climatic input data for the physically-based and fully distributed hydrological model J2000, which was developed by Peter Krause in 2001. The data and the model output as well as the gained hydrological system understanding will be used to regionalize the outputs for the whole GMRB. The regionalization will be verified through observed data.

Galindo- Leal, C., De Gusmão Câmara, I., 2003. The Atlantic Forest of South America. Biodiversity Status, Threats and Outlook.- Washington.
Krause, P., 2001. Das hydrologische Modellsystem J2000 – Beschreibung und Anwendung in großen Flußgebieten (The hydrological modelling system J2000 – Documentation and application in large river basins); Schriften des Forschungszentrums Jülich, Reihe Umwelt/Environment, Band 29
Myers, N., Mittermeier, R. A., Mittermeier, C. G., Da Fonseca, G. A. B. & Kent, J., 2000. Biodiversity hotspots for conservation priorities.- Nature, Vol. 403: 853-858.

Supervisor: Prof. Dr. Wolfgang Flügel, Prof. Dr. Jackson Roehrig

Publications
Künne, A. Fink, M., Kipka H., Krause P. and W.-A. Flügel (2012): Regionalization of meso-scale physically based nitrogen modeling
outputs to the macro-scale by the use of regression trees. In: Proceedings of the 14th Workshop on Large-scale Hydrological Modelling
Editor(s): R. Ludwig, K. Schulz, and M. Disse. Adv. Geosci., Vol. 31, 15–21, 2012.

http://www.adv-geosci.net/31/index.html

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