Effects of gravel properties on soil infiltration and runoff in soil-rock medium
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Abstract:
In order to study the effects of gravel properties on soil infiltration and runoff process in soil-rock medium, we conducted laboratory soil column experiments. We mixed two different rock fragments (gneiss and limestone) with the same soil. The gravel mass proportions (of the soil-rock medium) were 15% , 45% , 65% , and 90% respectively. Then, the relationship between cumulative infiltration and time were fitted with the Horton model and the Philip model. The results showed that: (1) For the same rock within the same amount of time, the cumulative infiltration of soil would decrease with the increase of gravel content, and the runoff would increase with the increase of gravel content. (2) With the same gravel proportion, within the same amount of time, the cumulative infiltration of gneiss was greater than that of limestone, and the runoff was less than that of limestone. (3) The Philip model and the Horton model can be used to fit the relationship between cumulative infiltration and time. As the gravel content increased, the infiltration rate A (if) tended to decrease, the soil infiltration rate Stended to decrease, and the initial infiltr ation rate ii tended to increase.
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