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Hydrology and Earth System Sciences An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/hess-2017-345
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research article
01 Sep 2017
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Hydrology and Earth System Sciences (HESS).
A Simple Temperature-Based Method to Estimate Heterogeneous Frozen Ground within a Distributed Watershed Model
Michael L. Follum1,2, Jeffrey D. Niemann2, Julie Parno3, and Charles W. Downer1 1Coastal and Hydraulics Laboratory, Vicksburg, MS, 39180, USA
2Department of Civil Engineering, Colorado State University, Fort Collins, CO, 80523, USA
3Cold Regions Research and Engineering Laboratory, Hanover, NH, 03755, USA
Abstract. Frozen ground can be important to flood production and is often heterogeneous within a watershed due to spatial variations in the available energy, insulation by snowpack and ground cover, and the thermal and moisture properties of the soil. The widely-used Continuous Frozen Ground Index (CFGI) model is a degree-day approach and identifies frozen ground using a simple frost index, which varies mainly with elevation through a temperature-elevation relationship. Similarly, snow depth and its insulating effect are also estimated based on elevation. The objective of this work is to more accurately represent the spatial heterogeneity of frozen ground in a distributed hydrologic model, Gridded Surface Subsurface Hydrologic Analysis (GSSHA), by modifying the CFGI method. Among the modifications, the snowpack and frost indices are simulated by replacing air temperature (a surrogate for the available energy) with a radiation-derived temperature that aims to better represent spatial variations in available energy. Ground cover is also included as an additional insulator of the soil. Furthermore, the modified Berggren Equation, which accounts for soil thermal conductivity and soil moisture, is used to convert the frost index into frost depth. The modified CFGI model is tested by application at six test sites within the Sleepers River Experimental Watershed in Vermont. Compared to the CFGI model, the modified CFGI model more accurately captures the variations in frozen ground between the sites, inter-annual variations in frozen ground depths at a given site, and the occurrence of frozen ground.

Citation: Follum, M. L., Niemann, J. D., Parno, J., and Downer, C. W.: A Simple Temperature-Based Method to Estimate Heterogeneous Frozen Ground within a Distributed Watershed Model, Hydrol. Earth Syst. Sci. Discuss., https://doi.org/10.5194/hess-2017-345, in review, 2017.
Michael L. Follum et al.
Michael L. Follum et al.
Michael L. Follum et al.

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Short summary
Spatial patterns of snow and frozen ground within watersheds can impact the volume and timing of runoff. Commonly used snow and frozen ground simulation methods were modified to better account for the effects of topography and landcover on the spatial patterns of snow and frozen ground. When tested using a watershed in Vermont the modifications resulted in more accurate temporal and spatial simulation of both snow and frozen ground.
Spatial patterns of snow and frozen ground within watersheds can impact the volume and timing of...
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