Abstract:This paper presents a review of techniques for field measurement of suction, water content, and water hydraulic conductivity (permeability). Main problems in the use of field tensiometers are addressed and hints on how to improve tensiometer performance are given. Advantages and limitations of instruments for indirect measurement of suction including electrical conductivity sensors, thermal conductivity sensors, dielectric permittivity sensors, filter paper, and psychrometer are discussed. Techniques for water… Show more
“…Comparing both calibration curves, there is a strong indication for a temperature dependency. This is already known for soil sensors using time domain reflectrometry [42]. Higher temperatures correspond to lower permittivity of free water molecules and the amount of free water molecules depends on temperature variation.…”
“…Comparing both calibration curves, there is a strong indication for a temperature dependency. This is already known for soil sensors using time domain reflectrometry [42]. Higher temperatures correspond to lower permittivity of free water molecules and the amount of free water molecules depends on temperature variation.…”
“…The measurement is related to the physico-chemical properties of the soil (Keys, 1989). The instrument requires a trained operator due to the use of the radioactive source and is potentially hazardous to health and the environment (Tarantino et al, 2008). The equipment is expensive and requires extensive soil specific calibrations, which limits its use.…”
“…Quantification of water fluxes in the vadose zone is essential for many hydrological and environmental applications. Classical approaches based on matric potentials or tracer test data (e.g., Vereecken et al, 2008;Tarantino et al, 2009) are limited by the punctual nature of such measurements. The data might be strongly influenced by local heterogeneities and water fluxes are obtained indirectly by differencing.…”
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