Mapping permeability over the surface of the Earth

Geophysical Research Letters
By: , and 

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Abstract

Permeability, the ease of fluid flow through porous rocks and soils, is a fundamental but often poorly quantified component in the analysis of regional-scale water fluxes. Permeability is difficult to quantify because it varies over more than 13 orders of magnitude and is heterogeneous and dependent on flow direction. Indeed, at the regional scale, maps of permeability only exist for soil to depths of 1-2 m. Here we use an extensive compilation of results from hydrogeologic models to show that regional-scale (>5 km) permeability of consolidated and unconsolidated geologic units below soil horizons (hydrolithologies) can be characterized in a statistically meaningful way. The representative permeabilities of these hydrolithologies are used to map the distribution of near-surface (on the order of 100 m depth) permeability globally and over North America. The distribution of each hydrolithology is generally scale independent. The near-surface mean permeability is of the order of -5 x 10-14 m2. The results provide the first global picture of near-surface permeability and will be of particular value for evaluating global water resources and modeling the influence of climate-surface-subsurface interactions on global climate change.

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Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Mapping permeability over the surface of the Earth
Series title Geophysical Research Letters
Volume 38
Year Published 2011
Language English
Publisher American Geophysical Union
Publisher location Reston, VA
Contributing office(s) Central Mineral and Environmental Resources Science Center
Description 6 p.; L02401
Larger Work Type Article
Larger Work Subtype Journal Article
Larger Work Title Geophysical Research Letters
First page 1
Last page 6
Other Geospatial Earth
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