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.
|Title of host publication||Regional hydrological impacts of climate variability and change - Impact assessment and decision making. Symposium HS06 at IAHS 2005, 3-9 April 2005, Foz do Iguaçu, Brazil. IAHS publication 295|
|Editors||Thorsten Wagener, Stewart Franks, Hoshin V. Gupta, Eva Boegh, Luis Bastidas, Carlos Nobre, Carlos de Oliveira Galvao|
|Number of pages||356|
|Publication status||Published - 3 Apr 2005|
- Variance reduction function
- Temporal scales
- Red River basin
- Spatial scales
- Decision-support system
Booij, M. J., & Tran, H. M. (2005). Appropriate scales for hydro-climatological variables in the Red River basin. In T. Wagener, S. Franks, H. V. Gupta, E. Boegh, L. Bastidas, C. Nobre, & C. de Oliveira Galvao (Eds.), Regional hydrological impacts of climate variability and change - Impact assessment and decision making. Symposium HS06 at IAHS 2005, 3-9 April 2005, Foz do Iguaçu, Brazil. IAHS publication 295 (pp. 325-332). (IAHS publication; No. 295). IAHS Press.