Hydrologie urbaine : modélisation et effet d'échelle

Urban hydrology: modelisation and scale effect

Institut National des Sciences Appliquées de Lyon

Abstract

The modelisation of the rainfall transformation on an urban catchment presents two notable particularities: i) contributing zones are relatively easily identifiable and can be interpreted as impermeable zones directely linked to the stormwater sewer network; ii) the routes followed by the water are artificial (created according to simple rules) and are easily identifiable (street and roof gutters ...). In fact, urban hydrology allows us in theory to present the processes of production and transfer in great detail, especially with the present development of geographic information systems (GIS) in numerous large cities.

The purpose of this publication is to study the repetitive nature of the modelised reaction of urban catchments when the modelisation is decreased little by little. The results of different numerical experiments will be linked with a global quantification of the geometric network.