Accession Number : ADA184796
Title : Factors Affecting Water Migration in Frozen Soils.
Descriptive Note : Final rept.,
Corporate Author : COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER NH
Personal Author(s) : Xu, Xiaozu ; Oliphant, Joseph L ; Tice, Allen R
PDF Url : ADA184796
Report Date : Jul 1987
Pagination or Media Count : 23
Abstract : Soil-water potential was measured on three soils and influencing factors, including water content, soil texture, dry density and temperature, were investigated. The soil-water potential in unsaturated, unfrozen soils decreases with decreasing soil water content and soil dispersion, and increases with increasing temperature and dry density. Unfrozen water contents were determined by pulsed nuclear magnetic resonance and three factors thought of affect the unfrozen water content at a given temperature were investigated. Of these three factors, only increasing the salt concentration caused a large change in the unfrozen water versus temperature curves. Water migration in an unsaturated frozen soil (Morin clay) was determined in horizontally closed soil columns under linear temperature gradients. The flux of water migration was calculated from the water distribution curves before and after testing. The flux is directly proportional to the temperature gradient and inversely proportional to the square root of the test duration, and decreases with decreasing temperature and soil dry density.
Descriptors : *SOIL DYNAMICS, *GROUND WATER, *WATER FLOW, FREEZING, DENSITY, SOIL SURVEYS, ABSORPTION, TEMPERATURE GRADIENTS, SALTS, MIGRATION
Subject Categories : Soil Mechanics
Distribution Statement : APPROVED FOR PUBLIC RELEASE