Analysis of Groundwater Seepage Characteristics in Cold Regions

Abstract:

Frozen soil in cold regions can be divided into 2 types --- seasonal frozen soil and permafrost. Because of the frozen soil layer, there are obvious differences between the characteristics of groundwater seepage in cold regions and normal regions. The paper analyses the disappearance regulation of frozen soil layer and the mechanism of groundwater seepage in the unsaturated zone and saturated zone under the seasonal frozen soil and permafrost. The results show that the frozen soil layer has obvious influence towards soil water seepage in the unsaturated zone during the freezing and thawing process. When the warm period comes, it makes influence of soil moisture conservation in the unsaturated zone. At this time, the freezing porosity is completely filled with the ice of volume expansion. It is equivalent to the impermeable layer that is difficult to receive the vertical recharge. In the permafrost area, the atmospheric precipitation and surface water are major recharge sources to the aquifer, and the aquifer can also receive recharge from groundwater. During the cold season, the surface is frozen and the rainfall recharge source is cut off. It will be unconfined seepage with free surface, and form a saturated zone above the permafrost layer. During the freezing period, with the increase of frozen depth, the aquifer will freeze from top to bottom, and it will convert to a confined aquifer.

• Periodical: Advanced Materials Research (Volumes 550-553)
• Pages: 2565-2570
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.550-553.2565
• Online since: July 2012
• Authors: Chang Lei Dai, Yi Ding Zhang, Ji Liang Wang, Xin Xin Li
• Keywords: Cold Region, Frozen Soil Layer, Ground Water, Seepage Characteristics

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