Abstract/Details

Simulating the evolution of seasonal snowcover and snowmelt runoff using a distributed energy balance model: Application to an alpine watershed in the Tobacco Root Mountains, Montana


2001 2001

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Abstract (summary)

A distributed energy-balance model was developed for simulating the seasonal snowmelt in rugged alpine terrain and applied to a 45 km2 headwater catchment in the Tobacco Root Mountains, Montana. Micrometeorological data that were collected over the 1997–1998 snow-accumulation and snowmelt seasons were used as boundary conditions for estimating initial snow distributions as well as calculating the timing and distribution of snowmelt from the basin. Simulated snowmelt volumes compare favorably with measured outflow from a stream gage located just downstream of the study area. Results of this study demonstrate that the representation of heterogeneity in complex terrain produces realistic energy and resultant snow-cover distributions throughout the snowmelt season. As in many other studies, the patterns of snowmelt were highly correlated to the distribution of net radiation in the watershed. Although the primary control on snowmelt patterns was net radiation, the initial distribution of snow-water equivalent was also a dominant factor. Snowmelt from individual subcatchments in the study area produces inflow hydrographs that reflect the heterogeneous attributes of terrain and ground cover that characterize each sub-basin. Season-long simulations were also conducted using simplifying assumptions of isotropy in calculating the diffuse irradiance components in the energy-balance snowmelt model. Results from the simulations using isotropic assumptions were compared to the energy-balance snowmelt model, which assumes that diffuse irradiances are anisotropic. The amount of calculated snowmelt varied between the two methods, suggesting that isotropic assumptions could account for underestimation of as much as 106 cubic meters of snowmelt over a single season. These results indicate that the assumption of isotropic conditions appears to be suitable for representation of areas with little surrounding topographic influence but not for areas of rugged terrain that constitute most snowmelt-driven watersheds of the western United States.

Indexing (details)


Subject
Hydrology;
Geophysics
Classification
0388: Hydrology
0373: Geophysics
Identifier / keyword
Earth sciences, Alpine watershed, Montana, Runoff, Snowmelt, Tobacco Root Mountains
Title
Simulating the evolution of seasonal snowcover and snowmelt runoff using a distributed energy balance model: Application to an alpine watershed in the Tobacco Root Mountains, Montana
Author
Letsinger, Sally Libbey
Number of pages
217
Publication year
2001
Degree date
2001
School code
0093
Source
DAI-B 62/08, Dissertation Abstracts International
Place of publication
Ann Arbor
Country of publication
United States
ISBN
9780493361444, 0493361448
Advisor
Olyphant, Greg A.
University/institution
Indiana University
University location
United States -- Indiana
Degree
Ph.D.
Source type
Dissertations & Theses
Language
English
Document type
Dissertation/Thesis
Dissertation/thesis number
3024298
ProQuest document ID
275854671
Copyright
Database copyright ProQuest LLC; ProQuest does not claim copyright in the individual underlying works.
Document URL
http://search.proquest.com/docview/275854671
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