SURFACE RUNOFF MODELLING IN STEEP TERRAIN IN A GIS ENVIRONMENT

摘要

The GIS implicit incorporation into hydraulic modelling is not yet a common practice. The attempts for introducing such approach may face definite problems, of which overcoming needs some new specific developments. Such specific approach has been discussed in this paper for the case of surface runoff modelling on steep terrain in the GIS environment. Crucial problem in this case is the velocity vectors transfer from their actual values, associated with the inclined planes of their origin, to a horizontal GIS layer. Equations (22), (44) and (45) are contributions in this respect and are an alternative to the usual approach of employing 1D Saint-Venant equations in hydraulic modelling in 2D space, which is incorrect in principal.