Articles | Volume 3, issue 1
Hydrol. Earth Syst. Sci., 3, 137–149, 1999
https://doi.org/10.5194/hess-3-137-1999

Special issue: The TIGER Programme

Hydrol. Earth Syst. Sci., 3, 137–149, 1999
https://doi.org/10.5194/hess-3-137-1999

  31 Mar 1999

31 Mar 1999

The UP modelling system for large scale hydrology: simulation of the Arkansas-Red River basin

C. G. Kilsby, J. Ewen, W. T. Sloan, A. Burton, C. S. Fallows, and P. E. O'Connell C. G. Kilsby et al.
  • Water Resource Systems Research Laboratory, Department of Civil Engineering, University of Newcastle, Newcastle upon Tyne, NE1 7RU, UK.
  • email: c.g.kilsby@ncl.ac.uk

Abstract. The UP (Upscaled Physically-based) hydrological modelling system to the Arkansas-Red River basin (USA) is designed for macro-scale simulations of land surface processes, and aims for a physical basis and, avoids the use of discharge records in the direct calibration of parameters. This is achieved in a two stage process: in the first stage parametrizations are derived from detailed modelling of selected representative small and then used in a second stage in which a simple distributed model is used to simulate the dynamic behaviour of the whole basin. The first stage of the process is described in a companion paper (Ewen et al., this issue), and the second stage of this process is described here. The model operated at an hourly time-step on 17-km grid squares for a two year simulation period, and represents all the important hydrological processes including regional aquifer recharge, groundwater discharge, infiltration- and saturation-excess runoff, evapotranspiration, snowmelt, overland and channel flow. Outputs from the model are discussed, and include river discharge at gauging stations and space-time fields of evaporation and soil moisture. Whilst the model efficiency assessed by comparison of simulated and observed discharge records is not as good as could be achieved with a model calibrated against discharge, there are considerable advantages in retaining a physical basis in applications to ungauged river basins and assessments of impacts of land use or climate change.

Special issue
Download