A mathematical hydrological model for the ungauged catchment
In geographical hydrology the~e has been more interest in scientific
rather than in practical application of mathematical models of catchment
hydrology. This thesis emphasizes the importance of examining the
potential of developments in scientific research programmes for
practical hydrological applications, and in particular provides
discussion upon the following five issues:
1 The application of hydrological models to ungauged catchments where
no historical streamflow record is available for calibration.
2 The potential of hydrological models for routine and operational
application. This application limits the data and computer resources
which are available for use.
3 The development and application of a thorough model evaluation
strategy which examines the suitability of a model in the context of
a specific application requirement.
4 The selection of a conceptually sound model structure.
S The development and evaluation of a suitable methodology for the
incorporation of the spatial variability of catchments into
To provide a basis for the discussion of these five issues, this thesis
provides the details of the modification of a currently used
hydrological model, RYMO. The modification of this model involves the
replacement of the empirical curve number model for runoff derivation
with a physically based parameter infiltration model. A number of
comparisons of HYMO and the modified version, HYM02, indicates that
conceptual, parameter estimation, prediction, and sensitivity
improvements have indeed been secured by the development of the modified