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RESEARCH PRODUCT
Appendix – Additional Measurements
Laurent LassabatereRafael Angulo-jaramilloMassimo IovinoVincenzo Bagarellosubject
Infiltration (hydrology)Water potentialWater retention curveSoil waterEnvironmental scienceSoil scienceInfiltrometerReflectometryWater contentBulk densitydescription
This appendix deals with the determination of different soil physical and hydraulic characteristics used in the analysis and/or interpretation of the infiltration experiments. The core method and the excavation method for measurement of soil bulk density are initially presented. Determination of soil water content by the thermo-gravimetric and the Time Domain Reflectometry methods is then illustrated. Subsequently, field measurement of soil water matric potential by tensiometers is discussed. Laboratory determination of the soil water retention curve by tensiometric and pressiometric techniques is also described. Finally, different methods to test water stability of soil aggregates are illustrated since different mechanism of aggregate breakdown by water can occur. In particular, the water drop test, the single sieve stability test, the modified Emerson water dispersion test, the ultrasonic dispersion test, the multiple sieve method and a procedure to test soil’s sensitivity to slaking, swelling and dispersion are summarized. Any of these soil properties find application in some of the infiltrometer methods illustrated in the previous chapters. For example, soil bulk density is used in the estimation of the hydraulic characteristic curves of the soil by providing an estimate for soil porosity or the volumetric water content of the saturated soil. Soil water content must be measured to apply different analysis procedures of infiltrometer data. Determining the soil water matric potential in the field gives information on the energy status of soil water at the beginning of an infiltrometer experiment. Points of the water retention curve are needed for numerical inversion of tension infiltrometer data. Stability of soil aggregates to water can influence the measured infiltration process and consequently the estimated soil hydraulic properties.
year | journal | country | edition | language |
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2016-01-01 |