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Field measurement of the velocity of overland flow using dye tracing

Field measurement of the velocity of overland flow using dye tracing A new method of computing the mean velocity of overland flow using dye tracing is proposed in which a specified cross‐section is divided into zones of relatively uniform flow characteristics, termed partial sections. The mean surface velocity for each partial section is determined by timing the passage of injected dye, and this figure is multiplied by 0.67, 0.70, or 0.80, depending on whether the flow is laminar, transitional, or turbulent, to give mean velocity. The mean velocity for the entire cross‐section is calculated by multiplying the mean velocity of each partial section by its cross‐sectional area, summing the products for all the partial sections, and dividing by the total area of the cross‐section. A field test shows that mean velocity derived in this manner differs from mean velocity derived by the discharge method (i.e. by dividing discharge measured volumetrically by cross‐sectional area) by an average of only 7.07 per cent. Thus the partial‐section technique appears to provide a reliable method of estimating mean velocity of overland flow. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Earth Surface Processes and Landforms Wiley

Field measurement of the velocity of overland flow using dye tracing

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References (8)

Publisher
Wiley
Copyright
Copyright © 1986 John Wiley & Sons, Ltd
ISSN
0197-9337
eISSN
1096-9837
DOI
10.1002/esp.3290110608
Publisher site
See Article on Publisher Site

Abstract

A new method of computing the mean velocity of overland flow using dye tracing is proposed in which a specified cross‐section is divided into zones of relatively uniform flow characteristics, termed partial sections. The mean surface velocity for each partial section is determined by timing the passage of injected dye, and this figure is multiplied by 0.67, 0.70, or 0.80, depending on whether the flow is laminar, transitional, or turbulent, to give mean velocity. The mean velocity for the entire cross‐section is calculated by multiplying the mean velocity of each partial section by its cross‐sectional area, summing the products for all the partial sections, and dividing by the total area of the cross‐section. A field test shows that mean velocity derived in this manner differs from mean velocity derived by the discharge method (i.e. by dividing discharge measured volumetrically by cross‐sectional area) by an average of only 7.07 per cent. Thus the partial‐section technique appears to provide a reliable method of estimating mean velocity of overland flow.

Journal

Earth Surface Processes and Landforms – Wiley

Published: Nov 1, 1986

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