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Primary Particle and Aggregate Size Distribution of Eroded Soil From Sequenced Rainfall Events
Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.orgCitation: Transactions of the ASAE. 26 (6): 1773-1777. (doi: 10.13031/2013.33841) @1983
Authors: J. Kent Mitchell, Saied Mostaghimi, Melcy C. Pond
ABSTRACT LABORATORY studies were conducted to study the effects of a sequencing rainfall intensity on the aggregate and primary particle-size distributions of eroded soil. Rainfall intensities of 25 mm/h (low intensity) and 64 mm/h (high intensity) were applied to Flanagan and Dubuque silt loam soils. All intensity combinations were used. Initially, the clay percentages of the eroded material were greater and the silt percentages were smaller than those of the original soils, but as rainfall continued, the primary particle-size distribution of the eroded soils approached those of the original soils in most cases. Low-intensity rainfall produced eroded material with higher percentages of clay-size aggregates than did the high-intensity rainfall. The intensity of the first hour rainfall had little effect on the size distribution of the eroded material from the second hour rainfall for each soil. However, differences in the primary particle-size distributions of the eroded material were observed when the two soils were subjected to a first hour high-intensity rainfall. The intensity of the first hour rainfall did not affect the runoff or eroded-material quantities of the second hour rainfall.