Mechanisms and processes of crust formation on artificial aggregates, 1: Effect of initial moisture conditions on aggregate stability and crusting
1997
Tanaka, U. (Kyoto Univ. (Japan). Coll. of Agriculture) | Yokoi, Y. | Kosaki, T. | Kyuma, K.
Assuming that the degree of aggregate disintegration or stability is affected by the initial moisture conditions,and that the uppermost zone of the soil surface, where a crust is formed, is subjected to the fluctuations of the moisture content under field conditions, the relations among the initial soil moisture conditions, aggregate stability and crust formation should be analyzed in order to elucidate the mechanisms and processes of crusting. Since rainfall is the major factor involved in the disintegration of soil aggregates at the surface through the slaking and impact actions, we determined the degree of aggregate disintegration with slaking and of crusting formed by simulated rainfall treatment as follows: intensity, 4..58 mm min(-1); water drop diameter, 2.17 mm; rainfall duration, 2 and 5 min, using artificially granulated aggregates, 1.0 to 2.0 mm in diameter, under moisture conditions preliminarily adjusted at definite levels of matric suction, 0.98 kPa to 9.81 MPa
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