Large-scale catchment model of water balance dynamics for south-west catchments

The understanding of hydrologic response over a range of scales is an important unresolved problem. The approach adopted in this paper is to identify and formulate suitable consititutive relations at the small catchment scale and meke the necessary linkages to construct a model applicable at the large catchment scale. The parameters that determine hydrologic response exhibit multiple scales of variability. Terefore in ascending from one scale to the other, the integration is carried out with respect to the statistical distributions of these parameters. In this way the small catchment scale parameterizations are used as the building blocks to construct models for larger catchments, retaining the relevant physics necessary to represent the hydrologic processes at these scales.