Title
Effect of Vegetation on the Accumulation and Melting of Snow at the TW Daniels Experimental Forest
Date of Award:
12-2011
Document Type:
Dissertation
Degree Name:
Doctor of Philosophy (PhD)
Department:
Civil and Environmental Engineering
Committee Chair(s)
David G. Tarboton
Committee
David G. Tarboton
Committee
Jagath J. Kaluarchchi
Committee
Christopher M.U. Neale
Committee
Scott B. Jones
Committee
Charlie Luce
Abstract
Snow melt is an important component of Western US water resources, accounting for about 50-80% of the annual runoff. Prediction of runoff from snowmelt in heterogeneous watersheds requires the quantification of physical processes accounting for the effects of forest canopy on snow accumulation, melt and sublimation. The forest canopy intercepts snowfall that resulting in smaller snow accumulations in forest area than in open area. The forest canopy also modifies the energy exchange between snow surface and the atmosphere, and alters the sublimation and melting of sub-canopy snow relative to open area. This dissertation has examined ways to improve snowmelt modeling capability to better account for canopy effects and has presented enhancements to an energy balance model that include i) an improved representation of the transmission of radiation through the canopy, ii) an improved representation of the atmospheric transport of heat and water vapor between the snow on the ground, in the canopy and the atmosphere above, and iii) an improved representation of the processes of canopy snow interception and unloading. These enhancements were evaluated against 4 years of field data (2006-2010) collected at the TW Daniels Experimental Forest (TWDEF) located 30 miles N-E of Logan. Observations included continuous automated climate and snow depth measurements supported by periodic field measurements of snow water equivalent and temperature in four different vegetation classes (grass, shrubs, coniferous forest, deciduous forest). The enhanced canopy components were included into the Utah Energy Balance Snowmelt model and provide improved capability to predict the surface water input and runoff from snowmelt in heterogeneous watersheds using a parsimonious approach that can be used with practically available information.
Checksum
5574bcbb0fe7cd266348a914d01f8f72
Recommended Citation
Mahat, Vinod, "Effect of Vegetation on the Accumulation and Melting of Snow at the TW Daniels Experimental Forest" (2011). All Graduate Theses and Dissertations. 1078.
https://digitalcommons.usu.edu/etd/1078
Included in
Copyright for this work is retained by the student. If you have any questions regarding the inclusion of this work in the Digital Commons, please email us at .
Comments
Publication made available electronically December 21, 2011.