Universität zu Köln

Naeschen, Kristian, Diekkrueger, Bernd, Leemhuis, Constanze, Steinbach, Stefanie, Seregina, Larisa S., Thonfeld, Frank ORCID: 0000-0002-3371-7206 and van der Linden, Roderick ORCID: 0000-0002-7364-323X (2018). Hydrological Modeling in Data-Scarce Catchments: The Kilombero Floodplain in Tanzania. Water, 10 (5). BASEL: MDPI. ISSN 2073-4441

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Abstract

Deterioration of upland soils, demographic growth, and climate change all lead to an increased utilization of wetlands in East Africa. This considerable pressure on wetland resources results in trade-offs between those resources and their related ecosystem services. Furthermore, relationships between catchment attributes and available wetland water resources are one of the key drivers that might lead to wetland degradation. To investigate the impacts of these developments on catchment-wetland water resources, the Soil and Water Assessment Tool (SWAT) was applied to the Kilombero Catchment in Tanzania, which is like many other East African catchments, as it is characterized by overall data scarcity. Due to the lack of recent discharge data, the model was calibrated for the period from 1958-1965 (R-2 = 0.86, NSE = 0.85, KGE = 0.93) and validated from 1966-1970 (R-2 = 0.80, NSE = 0.80, KGE = 0.89) with the sequential uncertainty fitting algorithm (SUFI-2) on a daily resolution. Results show the dependency of the wetland on baseflow contribution from the enclosing catchment, especially in dry season. Main contributions with regard to overall water yield arise from the northern mountains and the southeastern highlands, which are characterized by steep slopes and a high share of forest and savanna vegetation, respectively. Simulations of land use change effects, generated with Landsat images from the 1970s up to 2014, show severe shifts in the water balance components on the subcatchment scale due to anthropogenic activities. Sustainable management of the investigated catchment should therefore account for the catchment-wetland interaction concerning water resources, with a special emphasis on groundwater fluxes to ensure future food production as well as the preservation of the wetland ecosystem.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Naeschen, Kristian UNSPECIFIED UNSPECIFIED UNSPECIFIED Diekkrueger, Bernd UNSPECIFIED UNSPECIFIED UNSPECIFIED Leemhuis, Constanze UNSPECIFIED UNSPECIFIED UNSPECIFIED Steinbach, Stefanie UNSPECIFIED UNSPECIFIED UNSPECIFIED Seregina, Larisa S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Thonfeld, Frank UNSPECIFIED orcid.org/0000-0002-3371-7206 UNSPECIFIED van der Linden, Roderick UNSPECIFIED orcid.org/0000-0002-7364-323X UNSPECIFIED
URN:	urn:nbn:de:hbz:38-187468
DOI:	10.3390/w10050599
Journal or Publication Title:	Water
Volume:	10
Number:	5
Date:	2018
Publisher:	MDPI
Place of Publication:	BASEL
ISSN:	2073-4441
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Geosciences > Institute for Geophysics and Meteorology
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language USE CHANGE IMPACTS; LAND-USE; WATER-RESOURCES; CLIMATE-CHANGE; PRECIPITATION DATA; RIVER-BASIN; SOIL; SWAT; PERFORMANCE; AFRICA Multiple languages Water Resources Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/18746