Porosity and Pore Size Distribution - USGS

REPRINT Nimmo, , 2004, Porosity and Pore Size Distribution , in Hillel, D., ed. Encyclopedia of Soils in the Environment: London, Elsevier, v. 3, p. 295-303. Porosity and Pore Size Distribution the medium. Thus we consider a single, con- J. R. Nimmo, Geological Survey, tiguous pore space within the body of soil. In Menlo Park, CA 94025, USA. general, the pore space has fluid pathways that Key Words: soil structure, aggregation, fractals, are tortuous, variably constricted, and usually soil hydraulic properties, hydraulic conductivity, soil highly connected. Figure 1 is an example of a water retention, hysteresis, tillage, soil compaction, two-dimensional cross section of soil pore solute transport. space. The pore space is often considered in terms A soil's Porosity and pore size Distribution of individual pores--an artificial concept that characterize its pore space, that portion of the enables quantifications of its essential charac- soil's volume that is not occupied by or iso- ter.

Porosity is often conceptually partitioned into two components, most commonly called textural and structural porosity. The textural component is the value the porosity would have if the arrangement of the particles were random, as described above for granular mate-rial without cementing. That is, the textural

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