Applying constant precipitation intensity,which does not occur in natural events,is one of the main limitations concerning rainfall simulators in soil erosion studies.The present work evaluated the InfiAsper rainfall simulator operating with a new control panel to program rainfalls with different pre-cipitation intensities(PI).Infiltration rates and soil and water losses were evaluated in a Distrophic Acrisol(clay loam texture)with simulated rainfalls of 30 mm and duration of 40 min,considering advanced(AD),intermediate(IN),delayed(DE),and inverted intermediate(Ⅱ)patterns,all with PI peaks of 110 mm h-1,and a constant(CT)pattern.The experimental design was in randomized blocks with five treatments(rainfall patterns)and experimental units measuring 2.5×2.5 m.The simulator worked satisfactorily,applying the rainfall according to the preconfigured programs.The simulated rainfall with the CT and Ⅱ patterns did not promote runoff nor soil loss.Infiltration and runoff rates varied according to the applied rainfall pattern,reaching 97.8 and 273 mm h-1(AD),82.1 and 39.5 mm h-1(IN),and 76.2 and 49.7 mm h-1(DE),respectively.Soil loss and surface runoff totaled each 4.77 g m-2 and 3.9 mm(AD),6.70 g m-2 and 6.8 mm(IN),and 6.03 g m-2 and 7.0 mm(DE).The InfiAsper simulator modified enables varying precipitation intensity besides obtaining satisfactory results in the field and information consistent with the expected characteristics of natural rainfall patterns.In the intermediate and delayed rainfall patterns,soil and water losses are higher than in the advanced.

Department of Engineering,Institute of Technology,Federal Rural University of Rio de Janeiro,Seropédica,Rio de Janeiro,Brazil;Postgraduate Program in Agronomy-Soil Sciences,Federal Rural University of Rio de Janeiro,Seropédica,Rio de Janeiro,Brazil;Agronomy Department,Federal Institute of Education,Science and Technology of Rond?nia,Campus Ariquemes,RO 257,Km 13,Ariquemes,RO,76870-000,Brazil;Department of Soil Science,Institute of Agronomy,Federal Rural University of Rio de Janeiro,Seropédica,RJ,Brazil

[1]Daniel Fonseca de Carvalho;Pietro Menezes Sanchez Macedo;Marinaldo Ferreira Pinto;Wilk Sampaio de Almeida;Nivaldo Schultz-.Soil loss and runoff obtained with customized precipitation patterns simulated by InfiAsper)[J].国际水土保持研究（英文）,2022(03):407-413

InfiAsper,simulators,Distrophic,Acrisol,preconfigured

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