TL;DRAbstract
The movement of water and dissolved materials through the soil profile must often be predicted. Flux must be distinguished from a water content or solute concentration. Water content and solute content can be measured by a variety of techniques, and these measurements can be mathematically manipulated to provide estimations of flux. This chapter focuses on the several types of approaches to estimation of water flux under field conditions: direct measurement with a soil water flux meter, estimation from continuity principles, prediction with numerical models. The volumetric water flux is measured by intercepting soil water flow with an in situ soil water flux meter. The water balance method is intended to provide, with as few measurements as possible, an estimate of water flux at a given depth on a short-term basis. Solute concentrations can be measured directly in the field, either by soil sampling or with porous ceramic extraction devices.
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The movement of water and dissolved materials through the soil profile must often be predicted. Flux must be distinguished from a water content or solute concentration. Water content and solute content can be measured by a variety of techniques, and these measurements can be mathematically manipulated to provide estimations of flux. This chapter focuses on the several types of approaches to estimation of water flux under field conditions: direct measurement with a soil water flux meter, estimation from continuity principles, prediction with numerical models. The volumetric water flux is measured by intercepting soil water flow with an in situ soil water flux meter. The water balance method is intended to provide, with as few measurements as possible, an estimate of water flux at a given depth on a short-term basis. Solute concentrations can be measured directly in the field, either by soil sampling or with porous ceramic extraction devices.
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