Derivation of Soil-Specific Streaming Potential Electrical Parameters from Hydrodynamic Characteristics of Partially Saturated Soils

作者: D. Jougnot , N. Linde , A. Revil , C. Doussan

DOI: 10.2136/VZJ2011.0086

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摘要: Water movement in unsaturated soils gives rise to measurable electrical potential differences that are related the flow direction and volumetric fluxes, as well soil properties themselves. Laboratory field data suggest these so-called streaming potentials may be several orders of magnitudes larger than theoretical predictions only consider influence relative permeability conductivity on self (SP) data. Recent work has improved somewhat by considering how excess charge pore space scales with inverse water saturation. We present a new approach uses flux-averaged charge, not predict potentials. relationships for this effective varies saturation typical using either retention or function. find large between types based function display best agreement The better explain laboratory previous allow us recorded following rainfall event sandy loam, whereas models values three magnitude too small. strong signals media can used gain information about fluxes (including very small ones film flow), but also constrain function, curve,

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