Hydraulic conductivity in frozen soils

1976 ◽  
Vol 1 (4) ◽  
pp. 349-360 ◽  
Author(s):  
T. P. Burt ◽  
P. J. Williams
Keyword(s):  
Hydraulic Conductivity ◽  
Frozen Soils

On the prediction of hydraulic conductivity of frozen soils

1996 ◽  
Vol 33 (1) ◽  
pp. 176-180 ◽  
Author(s):  
Vlodek R Tarnawski ◽  
Bernhard Wagner
Keyword(s):  
Grain Size ◽  
Hydraulic Conductivity ◽  
Water Content ◽  
Bulk Density ◽  
Size Distribution ◽  
Grain Size Distribution ◽  
Input Data ◽  
Unfrozen Water ◽  
Frozen Soils ◽  
Unfrozen Water Content

This paper describes a mathematical model for predicting the hydraulic conductivity of partially frozen soils on the basis of limited input data such as grain size distribution and bulk density or porosity. A new model is based on an analogy for the hydraulic conductivity of frozen and unfrozen soils and models for the estimation of hydraulic properties of soils and unfrozen water content. Campbell's model was used for prediction of soil-water characteristics from limited data, while unfrozen water content was obtained from two models (by P.J. Williams and D.M. Anderson) applied to two different temperature ranges. The new model can be used for the rapid estimation of the hydraulic conductivity of practically any freezing soil having log-normal grain size distribution and for computer simulation of moisture migration in soils below the freezing point. An acceptable conformity between the model prediction and measured data for pure sand has been achieved. The computer program developed requires the following input data: grain size distribution, bulk density or porosity, and soil temperature. Key words: frozen soils, hydraulic conductivity, bulk density, grain size distribution, unfrozen water content.

Hydraulic Conductivity Measurement for Three Frozen and Unfrozen Soils in the Red River of the North Basin

2021 ◽  
Vol 64 (3) ◽  
pp. 761-770
Author(s):  
Debjit Roy ◽  
Xinhua Jia ◽  
Xuefeng Chu ◽  
Jennifer M. Jacobs
Keyword(s):  
Hydraulic Conductivity ◽  
Sandy Loam ◽  
Field Capacity ◽  
Frozen Soil ◽  
Red River ◽  
Silty Clay ◽  
Frozen Soils ◽  
Soil Hydraulic Conductivity ◽  
The North ◽  
Soil Hydraulic

HighlightsHydraulic conductivity was measured in frozen and unfrozen soil conditions by a minidisk infiltrometer.In the RRB, frozen sandy loam and silty clay soils had the highest and lowest hydraulic conductivity, respectively.Three simple equations were developed for the three soils to predict frozen soil hydraulic conductivity.Freeze-thaw cycles reduced soil hydraulic conductivity.Abstract. Hydraulic conductivity (k) is a key parameter in describing water movement through a soil profile. In the Red River of the North basin (RRB), the hydraulic properties of frozen soils vary with temperature, water content, and other factors. In this study, a minidisk infiltrometer was used to measure the k values of three soils from the RRB: Colvin silty clay loam, Fargo silty clay, and Hecla sandy loam. The k values were measured for frozen and unfrozen soils with five different initial soil water contents: oven dry, permanent wilting point, field capacity, midway between permanent wilting point and field capacity, and saturation. The results showed that the mean k value of a frozen soil increased with an increase in initial soil water contents. Hecla soil had the highest k values and Fargo soil had the lowest k values for frozen soils. Three equations were fitted with the measured k values of Colvin silty clay loam, Fargo silty clay, and Hecla sandy loam soils. The k values were also estimated using the Motovilov model. When evaluating model performance, the fitted regression models agreed more closely with the measured k values (index of agreement, d, values of 0.96, 0.94, and 0.94 for Colvin, Fargo, and Hecla soils, respectively) than Motovilov models. Based on overall considerations of statistical measures, the fitted regression models predicted the k values better than Motovilov models for all three frozen soils. It was also found that the k values decreased with an increase in the number of the freeze and thaw cycles that changed the soil properties. Keywords: Frozen soil, Hydraulic conductivity, Mini disk infiltrometer, Red River Valley.

Measurement of Hydraulic Conductivity of Frozen Soils

1974 ◽  
Vol 11 (4) ◽  
pp. 647-650 ◽  
Author(s):  
P. J. Williams ◽  
T. P. Burt
Keyword(s):  
Free Energy ◽  
Weak Solution ◽  
Hydraulic Conductivity ◽  
Soil Type ◽  
Pure Water ◽  
Frozen Soils

Frozen soils contain a significant amount of water which moves under appropriate gradients. An apparatus has been devised for measuring the hydraulic conductivity. It involves the use of reservoirs containing a weak solution of lactose such that the free energy is initially reduced to that of the water in the soil. The solution therefore remains unfrozen. A gradient is established by application of pressure, and pure water moves in the sample. The hydraulic conductivity is found to depend on soil type and temperature.

Naturally Frozen Soils from the Field to the Laboratory

ISCORD 2013 ◽  
2013 ◽  
Author(s):  
Benjamin A. Still ◽  
Zhaohui (Joey) Yang ◽  
Xiaoxuan Ge ◽  
Anthony Paris
Keyword(s):  
Frozen Soils
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