Call number:
ZSP-201-78/16
In:
CRREL Report, 78-16
Description / Table of Contents:
A model investigation of drifting snow conditions was conducted in a hydraulic flume using a sand-water analog. Model results were evaluated to define modeling parameters that would allow quantitative correlation between measured prototype drift conditions and the model. The modeled structure was the standard plan snow fence designed by the Wyoming Highway Department and installed along Interstate Highway 80 in 1971. The performance of this system was documented by the Rocky Mountain Forest and Range Experiment Station of the U.S. Forest Service. Models of the fence were constructed for three heights and two geometric scales. Geometric scaling was based on terrain roughness and boundary layer thickness considerations, while velocity scaling was based on particle fall velocity and threshold of motion characteristics. Simulation of the atmospheric boundary layer was found to be of primary importance. Velocity scaling analysis suggested the use of a 'significant wind' concept based on a combination of velocity magnitude and frequency. Similarity of precipitation rate was not essential, and could be altered within limits to adjust the time scale. The response of the model to the shape of model elements was significant. Although the model is distorted and inexact similarity is achieved, it appears useful on a practical basis.
Type of Medium:
Series available for loan
Pages:
vi, 26 Seiten
,
Illustrationen
Series Statement:
CRREL Report 78-16
URL:
https://hdl.handle.net/11681/9400
Language:
English
Note:
CONTENTS
Abstract
Preface
Nomenclature
Introduction
Background
Experimental design
Similitude considerations
The model
Model operation
Results
Velocity
Fence height
Porosity
Model correlation
Summary and conclusions
Recommeqdations for future work
Literature cited
Appendix A
Location:
AWI Archive
Branch Library:
AWI Library
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