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Title: Development of a coupled framework for simulating interactive effects of frozen soil and hydrological dynamics in permafrost regions
Authors: Strategic Environmental Research and Development Program (U.S.)
University of Alaska Fairbanks. Geophysical Institute.
Cold Regions Research and Engineering Laboratory (U.S.)
Pradhan, Nawa Raj.
Downer, Charles Wayne.
Marchenko, Sergei.
Liljedahl, Anna K.
Douglas, Thomas A.
Byrd, Aaron R.
Keywords: Permafrost
GIPL model
Coupled framework
Frozen soil
Soil temperature
Hydrological dynamics
Hydraulic conductivity
Climate change
Climate warming
Strategic Environmental Research and Development Program (SERDP)
Issue Date: Nov-2013
Publisher: Coastal and Hydraulics Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
Series/Report no.: ERDC TR ; 13-15.
Description: Technical Report
Abstract: Projections of long-term effects of climate warming on high latitude ecosystems require a coupled representation of soil thermal state and hydrological dynamics. We developed such a framework to explicitly simulate the soil moisture effects of soil thermal conductivity and heat capacity and its effects on hydrological response. Our model is the result of coupling the Gridded Surface Subsurface Hydrologic Analysis (GSSHA) model with the Geophysical Institute Permafrost Laboratory (GIPL) model. The GIPL model simulates soil temperature dynamics, the depth of seasonal freezing and thawing, and the permafrost location by numerically solving a one-dimensional nonlinear heat equation with phase change. The GSSHA model is a spatially explicit hydrological model that simulates two-dimensional groundwater flow and one-dimensional vadose zone flow. We combined these two models by incorporating the GIPL model into the GSSHA model. Our test case results indicate that freezing temperatures reduces soil storage capacity thereby producing higher peak discharges and lower base flow.
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