Predictions in Ungauged Basins: Promise and Progress (Proceedings of symposium S7 held during the Seventh IAHS Scientific Assembly at Foz do Iguaçu, Brazil, April 2005). IAHS Publ. 303, 2006, 443-453.

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The PUB Top-Down Modelling Working Group (TDWG): initial development and activities

IAN G. LITTLEWOOD¹, BARRY F. W. CROKE² & DAVID A. POST^2,3

1 Centre for Ecology and Hydrology, Wallingford OX10 8BB, UK

igl@ceh.ac.uk

2 Australian National University, Canberra ACT 0200, Australia

3 CSIRO Land and Water, Davies Laboratory, Townsville, Queensland, Australia

Abstract Contributing to the Preparation and Planning phase (2004–2006) of the International Association of Hydrological Sciences (IAHS) Decade (2003–2012) for Prediction in Ungauged Basins (PUB), the paper describes the background, aims and initial activities of the Top-Down modelling Working Group (TDWG). It summarizes broad features of the top-down modelling approach for estimating hydrological variables at ungauged sites. Links likely to develop between the TDWG and other PUB Working Groups as the PUB Decade unfolds further are mentioned. The TDWG website is introduced, which is intended to encourage dialogue within the TDWG, PUB and more widely. The proposed INTRAPUB project (Information TRAnsfer for Prediction in Ungauged Basins) is outlined.

Key words PUB; regionalization; top-down modelling

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