Search results for "Plot scale"
showing 3 items of 3 documents
Physical and hydraulic characterization of a clay soil at the plot scale
2010
Summary The soil physical and hydraulic properties have to be determined for interpreting and simulating many hydrological processes. An investigation was carried out to determine the physical and hydraulic characteristics of a clay soil at the plot scale. An intensive sampling of the surface soil layer of two plots of 4 × 11 m2 was carried out by measuring, for each plot, dry soil bulk density, ρb, and antecedent soil water content, θi, at 88 sampling points and field-saturated soil hydraulic conductivity, Kfs, at 176 sampling points. A wide range of Kfs values (0.7–5107 mm h−1) were measured by the Simplified Falling Head (SFH) technique. For each variable, the two plots yielded very simi…
USING A TRANSIENT INFILTROMETRIC TECHNIQUE FOR INTENSIVELY SAMPLING FIELD-SATURATED HYDRAULIC CONDUCTIVITY OF A CLAY SOIL IN TWO RUNOFF PLOTS
2012
Point measurement of soil properties allows to explain and simulate plot scale hydrological processes. An intensive sampling was carried out at the surface of an unsaturated clay soil to measure, on two adjacent plots of 4×11 m2 and two different dates (May 2007 and February-March 2008), dry soil bulk density, rb, and antecedent soil water content, qi, at 88 points. Field-saturated soil hydraulic conductivity, Kfs, was also measured at 176 points by the transient Simplified Falling Head technique to determine the soil water permeability characteristics at the beginning of a possible rainfall event yielding measurable runoff. The rb values did not differ significantly between the two dates b…
Checking generalization of the USLE-MM in central and South Italy
2018
The USLE-MM estimates event normalized plot soil loss, Ae,N, by an erosivity term given by the runoff coefficient, QR, times the single-storm erosion index, EI30, raised to an exponent b1 > 1. In this investigation, carried out at the three experi-mental sites of Bagnara, Masse and Sparacia, in Italy, the soundness of the USLE-MM scheme with a single exponent for the three sites was tested. The model was parameterized both locally and considering all sites simultaneously. The performances of the fitted models were established by considering all erosive events and also by distinguishing between events of different severity. The b1 exponent varied widely among the three sites (1.05 - 1.44) bu…