Freezing and thawing of soils under the influence of 300- and 90-year periods of temperature fluctuation
Mathematical modeling of perennial freeze and thaw is used in geocryology to solve both scientific and engineering problems. The surface temperature of a substrate is given as either a constant (stationary problem) or a function with a fixed period of fluctuation (periodic problem). In this paper a numerical permafrost model is developed for the southern Siberia region to study the influence of rhythmic climate change on the dynamics of permafrost. The mathematical model is represented as a two-dimensional heat conduction problem for a moist substrate with the latent heat effect for complex geological structures. This model takes into account a complex periodic temperature change at the soil surface and a stable heat flow at the lower and lateral boundaries for a steady domain. The enthalpy method to arrive at a numerical solution for this problem is used. It has been realized as a fully implicit local one-dimensional finite-difference scheme on an irregular grid. The calculations of the dynamics of temperature fields and permafrost boundaries are discussed to evaluate this scheme for the southern permafrost region of Eastern Siberia. The modeled results show that transects of temperature fields along some profiles (particularly at sites with complex geological structures) contain more information about permafrost dynamics than do ground temperature profiles from isolated boreholes.
- Research Organization:
- Moskovskij Gosudarstvennyj Univ., Moscow (Russian Federation). Dept. of Geology
- OSTI ID:
- 7015559
- Report Number(s):
- AD-P-007337/9/XAB
- Resource Relation:
- Other Information: This article is from 'Proceedings of the International Conference on the Role of the Polar Regions in Global Change Held in Fairbanks, Alaska on 11-15 June 1990. Volume 2', AD-A253 028, p543-548. See also Volume 1, AD-A253 027
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
CLIMATIC CHANGE
FORECASTING
PERMAFROST
MATHEMATICAL MODELS
SIBERIA
SOILS
FREEZING
THAWING
AMBIENT TEMPERATURE
ARCTIC REGIONS
BOREHOLES
ENTHALPY
FINITE DIFFERENCE METHOD
FLUCTUATIONS
HEAT TRANSFER
ASIA
CAVITIES
DEVELOPED COUNTRIES
ENERGY TRANSFER
EUROPE
ITERATIVE METHODS
NUMERICAL SOLUTION
PHYSICAL PROPERTIES
POLAR REGIONS
THERMODYNAMIC PROPERTIES
USSR
VARIATIONS
540110*
540210 - Environment
Terrestrial- Basic Studies- (1990-)