Leroux Yann auteur aut IRD Janeau Jean-Louis auteur aut IRD text conferencePaper spa text/pdf reformatted digital access The bare and cultivated indurated pyroclastic formations of the Equatorian Sierra (Cangahuas) are strongly susceptible to pluvial erosion. Their reincorporation to agriculture allows a partial control of ground loss and offers an alternative solution for agriculture management. Rain simulation gives information about imbibition, infiltration, runoff and erodibility. The "quadrat point" method enabled us to observe the evolution of surface features (rugosity, crusting and sealing of porosity). We make three campaignsof simulation just after the soil preparation, before and after the harrowing. We observed the variations of hydrodynamic parameters and the evolution of superficial structural features. A rough soil preparation (coarse particle size) enhance the infiltration rate and reduce the soil loss. On the contrary, a fine sized preparation weakens the roughness and seals the porosity by a superficial crusting. Then the efficiency of the running water is enhaced. (Résumé d'auteur). specialized PARCELLE D'EROSION AGREGAT HYDRODYNAMIQUE INFILTRATION SURFACE DU SOL RUGOSITE SEDIMENT SIMULATION DE PLUIE SOL VOLCANIQUE CANGAHUA EQUATEUR 068EROSOL Suelos Volcanicos Endurecidos, 3., Quito (ECU), 1996/12/9-14 430-442 Zebrowski Claude ed. edt IRD Quantin Paul ed. edt IRD Trujillo G. ed. edt IRD Villamar M.D. collab. clb IRD Quito (ECU) UE Quito (ECU) ORSTOM Quito (ECU) PUCE Quito UCE 1997 https://www.documentation.ird.fr/hor/fdi:010012925 [F A010012910] https://www.documentation.ird.fr/hor/fdi:010012925 https://horizon.documentation.ird.fr/exl-doc/pleins_textes/pleins_textes_7/divers2/010012925.pdf IRD - Base Horizon / Pleins textes 1998-03-03 2013-07-31 fdi:010012925 fre