HR: 10:35h
AN: H12A-02    [Abstracts]
TI: VALIDATION OF A COUPLED HYDROLOGICAL AND METEOROLOGICAL MODEL SYSTEM FOR INVESTIGATING FEEDBACK EFFECTS
AU: Overgaard, J
EM: jov@dhi.dk
AF: DHI Water & Environment, Agern Alle 5, Hoersholm, DK 2970 Denmark
AU: Overgaard, J
EM: jov@dhi.dk
AF: Technical University of Denmark, Environment & Resources DTU, Lyngby, DK2800 Denmark
AU: * Butts, M
EM: mib@dhi.dk
AF: DHI Water & Environment, Agern Alle 5, Hoersholm, DK 2970 Denmark
AU: Rosbjerg, D
EM: dr@er.dtu.dk
AF: Technical University of Denmark, Environment & Resources DTU, Lyngby, DK2800 Denmark
AB: Understanding of the interaction within the land surface hydrological processes is the key to determining the effect of land-use change and climate change on the hydrological systems. Traditionally, the hydrological impacts of climate change have been based on driving hydrological models with the output of region climate models. These climate models often operate at spatial and temporal scales that are much larger than the scales required to analyse the effects on the hydrological system. This is in part because of computational limitations and in part because of the physics of the regional models do not justify much higher resolution. Furthermore there is an inherent contradiction in this approach since these climate models include their own hydrological model component. Similarly in analysing the hydrological effects of land-use change the feedback to the meteorological system is often neglected. To address these issues a coupled hydrological and meteorological model system for evaluating interactions at hydrological (catchment) scales has been developed. A comprehensive hydrological modelling system describing the terrestrial component of the hydrological cycle has been modified to allow coupling to a local scale meteorological models. The hydrological mode includes both catchment rainfall-runoff processes and routing and hydraulic processes in the river system. As simulations can be run with and without coupling to the meteorological model, it is possible to evaluate the impact of feedbacks between the two systems on hydrological predictions. The uncoupled system is first validated against remote sensing and eddy correlation measurements at the field and landscape scale describing the hydrological and energy fluxes on the land-surface. The coupled system is then validated against field data describing both the atmosphere and hydrological system. Finally, a sensitivity analysis is carried out to examine the sensitivity of hydrological predictions to atmospheric feedbacks.
DE: 1818 Evapotranspiration
DE: 1833 Hydroclimatology
DE: 1836 Hydrologic budget (1655)
DE: 1854 Precipitation (3354)
DE: 1866 Soil moisture
SC: Hydrology [H]
MN: 2004 AGU Fall Meeting