Research review of hydrogeology in the permafrost and seasonal frozen regions
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Abstract:
Frozen soil hydrogeology mainly studies the spatial and temporal distribution and movement of water elements in frozen soil areas and their interaction with frozen soil.Microscopically,the unique hydrothermal parameters of frozen soil,such as freezing temperature,unfrozen water content and pore water pressure,determine the structure and physical and mechanical properties of frozen soil,and affect the freezing and thawing process of frozen soil.Macroscopically,the existence of permafrost has changed the conventional surface runoff and water system model,and the process of groundwater recharge,runoff and discharge has changed fundamentally due to the seasonal freezing and thawing of permafrost,which forms a special hydrogeological environment in permafrost region.The research progress of frozen soil hydrogeology at home and abroad from microscopic and macroscopic perspectives systematically summarized,and the technical methods including geophysical technology,hydrochemistry and frozen soil hydrological model are analyzes.The research results of groundwater overflow ice,snowmelt infiltration and frozen soil moisture conservation in alpine region are analyzed.The development trend of permafrost hydrology should further explore the mechanism of runoff generation and confluence on the basis of accumulating research data and technical methods,and establish a more perfect hydrological physical model of permafrost to quantitatively analyze the interaction between permafrost and water resources.
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