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Keyword: wind

RxCADRE 2012: In-situ fire behavior measurements

Datasets Posted on: March 15, 2018
This data publication contains fire behavior package (FBP) data; primarily flame temperature, horizontal and vertical mass flow, fire intensity, as well as ocular rates of spread (ROS), wind speed and direction data from the Prescribed Fire Combustion and Atmospheric Dynamics Research Experiment (RxCADRE) project conducted in November, 2012.

Partial cambial mortality in high-elevation Pinus aristata (Pinaceae)

Publications Posted on: September 30, 2016
Partial cambial mortality is a growth form that is characteristic of Pinus aristata trees. To better elucidate their cambial death pattern, tree size and aspect of cambial death data were gathered from three Pinus aristata forests in central Colorado, USA. Stripping frequency tended to be higher for larger diameter classes. Partial cambial mortality exhibits significant directionality within each stand.

All sonic anemometers need to correct for transducer and structural shadowing in their velocity measurements

Publications Posted on: June 08, 2016
Sonic anemometry is fundamental to all eddy-covariance studies of surface energy and ecosystem carbon and water balance. Recent studies have shown that some nonorthogonal anemometers underestimate vertical wind. Here it is hypothesized that this is due to a lack of transducer and structural shadowing correction.

A method of measuring rainfall on windy slopes

Publications Posted on: August 13, 2015
The object of precipitation measurement, as stated by Brooks (1), is to obtain "a fair sample of the fall reaching the earth's surface over the area represented by the measurement." The area referred to is horizontal, or map area. Even when measured on a slope, precipitation is always expressed as depth of water on a horizontal area.

Missing mountain water

Science Spotlights Posted on: August 13, 2015
New understanding has revealed that declines in snowpacks are not just related to warming temperatures but also to overall decreases in precipitation and streamflow in northwestern U.S. mountains, which result from slowing winter westerly windspeeds over the region. Warming related to an increased atmospheric CO2 may have contributed to the changed atmospheric pressure patterns that result in reduced wind speeds.

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.

Sundance Fire: an analysis of fire phenomena

Publications Posted on: March 31, 2009
The Sundance Fire on September 1, 1967, made a spectacular run of 16 miles in 9 hours and destroyed more than 50,000 acres. This run became the subject of a detailed research analysis of the environmental, topographic, and vegetation variables aimed at reconstructing and describing fire phenomena.