Appropriate scales for hydro-climatological
variables in the Red River basin


Booij, Martijn J. and Tran, Ha T. (2005) Appropriate scales for hydro-climatological
variables in the Red River basin.
In: Thorsten Wagener & Stewart Franks & Hoshin V. Gupta & Eva Boegh & Luis Bastidas & Carlos Nobre & Carlos de Oliveira Galvao (Eds.), Regional Hydrological Impacts of Climatic Variability and Change—Impact Assessment and Decision Making: Proceedings of symposium S6 held during the Seventh IAHS Scientific Assembly. IAHS publication (295). IAHS Press, pp. 325-334. ISBN 9781901502084

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Abstract:Decision support systems (DSSs) in water management should
preferably consist of appropriate models, which are complex enough to
represent important processes at a balanced level, but not unnecessarily
refined, taking into account research objectives, data availability and
uncertainties. This idea is illustrated by applying a methodology for the
determination of appropriate scales to the hydrological part of a DSS. The
variability of a relevant variable at the point scale, the discharge at the outlet,
is used to determine the appropriate temporal scale. The appropriate spatial
scale for precipitation is then determined at this appropriate temporal scale.
Results indicate an appropriate temporal scale varying between 12 h for
middle-sized upstream areas to 48 h for the complete river basin, accepting an
aggregation error of 10%. The appropriate spatial scale for precipitation for
the complete river basin is about 80 km. The appropriate scales found are
important for the hydrological model set-up and may indicate the requirements
for downscaling from climate model to hydrological model scale for climate
impact assessments.
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