Modelling Catchment Processes

Geomorphologists intent on modelling fluvial geomorphological processes and the dynamics of resulting river systems therefore have a significant challenge in integrating various influences over relevant time frames. This chapter focuses on model types with an avowedly catchment-scale potential for application. There are various approaches available to represent the transport laws implicit to landscape evolution models and in the reduced complexity modelling approach, the accuracy of process representation is forsaken to permit pseudo-realistic change in fluvial landforms over geomorphological time-scales. The different approaches to catchment processes modeling includes: conceptual model, problem-centred interpretative model, data-driven empirical model and numerical model. The chapter also considers tools for developing a catchment process model focusing on issues of representation and accuracy. Finally, it outlines the prospects for future model developments. Improved knowledge of geomorphological processes and transfer functions will give the component parts of catchment models increasingly more process accuracy.