Sensitivity of effective rainfall amount to land use description using GIS tool. Case of a small mediterranean catchment
Résumé
Distributed modelling in hydrology assess catchment subdivision to take into account physic characteristics. In this paper, we test
the effect of land use aggregation scheme on catchment hydrological response. Evolution of intra-subcatchment land use is studied
using statistic and entropy methods. The SCS-CN method is used to calculate effective rainfall which is here assimilated to hydrological
response. Our purpose is to determine the existence of a critical threshold-area appropriate for the application of hydrological
modelling. Land use aggregation effects on effective rainfall is assessed on small mediterranean catchment. The results
show that land use aggregation and land use classification type have significant effects on hydrological modelling and in particular
on effective rainfall modelling.
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