Advances in Geosciences www.adv-geosci.net 1680-7340 1680-7359 18 Advances and visions in large-scale hydrological modelling 2008 10.5194/adgeo-18-9-2008 http://www.adv-geosci.net/18/9/2008/ http://www.adv-geosci.net/18/9/2008/adgeo-18-9-2008.html http://www.adv-geosci.net/18/9/2008/adgeo-18-9-2008.pdf 9 13 2008-06-20 Estimation of ungauged Bahr el Jebel flows based on upstream water levels and large scale spatial rainfall data G. Petersen g.petersen@hrwallingford.co.uk H. Bast N. Fohrer HR Wallingford Ltd, Howbery Park, Wallingford, Oxfordshire, OX10 8BA, UK Christian-Albrechts-University of Kiel, Ecology Centre, Department of Hydrology and Water Resources Management, Olshausenstr. 75, 24118 Kiel, Germany The study derives Bahr el Jebel flow data at Mongalla, combining upstream flow from Lake Albert and torrential runoff derived from the Collaborative Historical African Rainfall Model (CHARM) rainfall data in the catchment between Lake Albert and Mongalla using GIS techniques. The results provide an updated rating curve for Lake Albert outflows and currently unavailable flow data at Mongalla, the entry to the Sudd swamp, with a high level of confidence for the period after 1983; data which are essential for detailed hydrological assessments of the swamp system with its significant importance for the economies and lives of people in the area. Funk, C., Michaelsen, J., Verdin, J., Artan, G., Husak, G., Senay, G., Gadain, H., and Magadazire, T.: The Collaborative Historical African Rainfall Model: Description and Evaluation, Int. J. Climatol., 23, 47–66, 2003. Entenman, D.: Geospatial Stream Flow Model (GeoSFM) Users Manual, V1.0, FEWSNET Intern, USGS Center for EROS, Sioux Falls, SD, USA, 2006. ESRI: ArcGIS: The Complete Enterprise GIS, http://www.esri.com/software/arcgis/, last access 24~December~2007, 2007. Hurst, H. E. and Phillips, P.: The Nile Basin, Volume V, The Hydrology of the Lake Plateau and the Bahr el Jebel, Schindlers Press, Cairo, Egypt, 1938. Hurst, H. E. and Phillips, P.: The Nile Basin, Volume IV and Supplements 1–13, Ten Day Mean and Monthly Mean Discharges of the Nile and its Tributaries, Cairo, Egypt, 1933. JIT – Jonglei Investigation Team: The Equatorial Nile Project and its Effects on the Anglo-Egyptian Sudan, Sudan Government, Khartoum, Sudan, 1954. Petersen, G., Abeya, J. A., and Fohrer, N.: Spatio-temporal water body and vegetation changes in the Nile swamps of southern Sudan, ADGEO, 11, 113–116, 2007.