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This article in SSSAJ

  1. Vol. 60 No. 4, p. 1223-1227
     
    Received: Apr 24, 1995
    Published: July, 1996


    * Corresponding author(s): morinu@vms.huji.ac.il
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doi:10.2136/sssaj1996.03615995006000040038x

The Effect of Raindrop Impact and Sheet Erosion on Infiltration Rate and Crust Formation

  1. Joseph Morin  and
  2. Jeannoux Van Winkel
  1. Soil Erosion Res. Stn., Rupin Institute post, Emek Hefer 60960, Israel
    Inst. Agric. Larenstein, College Velp, the Netherlands

Abstract

Abstract

Soil crust formation can result from the beating action of falling drops (structural crust) or the deposition of entrained eroded suspension in shell flow (deposional crust). To determine the relative importance of the two processes, an experiment was carried out with rainfall simulation under laboratory conditions. Clay soil exposed to the beating action of rain drops produced sheet erosion, which was deposited on a layer of clean sand downslope of the same continuous slope. The thin crust that was formed on the two parts of the slope, the clay and the sand, reduced the infiltration rates in time to values of 1 to 5 mm h−1. In comparison with the uniform clay slope, the main difference was the longer time needed to reach the low infiltration rates. Preventing the sand part from any rain impact beating extended the time needed to obtain the low infiltration rates that were nearly the same as those of the clay slope. The results provoke the question is the common theory of compacted crust by rain impact such an important factor?

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