Initial Observations of Salt Sieving in Frozen Soil

The role of solutes in the transport of water through frozen porous media is more complicated and subtle than simply lowering the freezing point of the water. This report presents evidence that unfrozen water films in soil act as a semipermeable membrane selectively filtering solutes. The calculated...

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Bibliographic Details
Main Author: Black, Patrick B.
Other Authors: COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER NH
Format: Text
Language:English
Published: 1994
Subjects:
Snow
Ice and Permafrost
*WATER FLOW
*PERMEABILITY
*FROZEN SOILS
TEST AND EVALUATION
PARTICLE SIZE
TEMPERATURE
THICKNESS
UNCERTAINTY
POROSITY
REVERSE OSMOSIS
SOILS
FREEZING
ICE
SOLUTES
TRANSPORT
MEMBRANES
SALTS
ANIONS
FILTRATION
PERMEAMETERS
HYDRAULIC CONDUCTIVITY
SALT SIEVING
Ice
permafrost
Online Access:http://www.dtic.mil/docs/citations/ADA286373
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA286373
Description
Summary:The role of solutes in the transport of water through frozen porous media is more complicated and subtle than simply lowering the freezing point of the water. This report presents evidence that unfrozen water films in soil act as a semipermeable membrane selectively filtering solutes. The calculated film thickness at the test temperature (-O.05 deg C) indicates that all solute should pass. The additional influence of anion exclusion arising from a diffuse electrical double layer suggests that solute movement is restricted and a 'salt- sieving' process results. Experimental observations are reported for a specially designed constant-volume ice-sandwich permeameter. Proposed research for a constant-stress ice-sandwich permeameter is presented as a means of overcoming experimental uncertainties of the present system. Frozen soils, Semipermeable membranes, Salt sieving, Soils.

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