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Thread: soil science - air permeability

  1. #1 soil science - air permeability 
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    Hi, I am looking into the verticla pressure profile (with depth) of soils on other planets.

    I am interested in what the pressure in the soil is at shallow depths, where the soil at depth may still be in contact with air that diffuses in an out of the soil. At this shallow depths even though you are in the soil the pressure may be the atmospheric pressure, as the soil is not 'closed off' from the atmosphere. The same way that if you are in a cave the pressure is the atmosphereic pressure rather than pressure due to overburden of the rock above you.

    Does anyone know anything about what the 'closure depth' is in soils? ie. at what depth is the pressure in the soil due to overburden rather than atmospheric diffusion?

    Cheers

    Eriita


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  3. #2 oops 
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    sorry for all the typos...


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  4. #3  
    Forum Isotope Bunbury's Avatar
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    I think the pressure at depth would be atmospheric pressure + the average density of the soil/gas (which you would calculate from the soil porosity and the densities of the soil and the atmosphere) times the depth of soil x acceleration of gravity for the planet in question.
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