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Keyword: complex terrain

Observations and predictability of gap winds in the Salmon River Canyon of Central Idaho, USA

Publications Posted on: October 05, 2018
This work investigates gap winds in a steep, deep river canyon prone to wildland fire. The driving mechanisms and the potential for forecasting the gap winds are investigated. The onset and strength of the gap winds are found to be correlated to the formation of an along-gap pressure gradient linked to periodic development of a thermal trough in the Pacific Northwest, USA.

Evidence for gap flows in the Birch Creek Valley, Idaho

Publications Posted on: September 26, 2017
A field study was conducted of flows in the Birch Creek Valley in eastern Idaho. There is a distinct topographic constriction in the Birch Creek Valley that creates two subbasins: an upper and lower valley. The data were classified into one of three groups based on synoptic influence (weak/absent, high wind speeds, and other evidence of synoptic influence).

Mean wind patterns and snow depths in an alpine-subalpine ecosystem as measured by damage to coniferous trees

Publications Posted on: May 29, 2015
1. Deformations of Engelmann spruce and subalpine fir trees were surveyed for the purpose of determining climatic wind speeds and directions and snow depths in the Glacier Lakes Ecosystem Experiments Site (GLEES) in the Snowy Range of southeastern Wyoming, USA. Tree deformations were recorded at 50- and 100-m grid intervals over areas of c. 30 ha and 300 ha, respectively, over the GLEES. 2.

High-resolution observations of the near-surface wind field over an isolated mountain and in a steep river canyon

Publications Posted on: April 10, 2015
A number of numerical wind flow models have been developed for simulating wind flow at relatively fine spatial resolutions (e.g., 100 m); however, there are very limited observational data available for evaluating these high-resolution models. This study presents high-resolution surface wind data sets collected from an isolated mountain and a steep river canyon.

Near-surface wind measurements

Projects Posted on: March 27, 2015
Wind predictions in complex terrain are important for a number of applications including wildland fire behavior, transport and dispersion of pollutants, and wind energy applications. Fine-scale changes in topography and vegetation substantially alter the flow field. Thus, accurate modeling for these applications in complex topography requires near-surface flow field predictions at a high spatial resolution.

WindNinja

Tools Posted on: August 05, 2014
WindNinja is a computer program that computes spatially varying wind fields for wildland fire and other applications requiring high resolution wind prediction in complex terrain.