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Laboratory evaluation of a numerical flood routing technique for channels subject to lateral inflows

Laboratory evaluation of a numerical flood routing technique for channels subject to lateral inflows As a result of advances in high speed digital computers, considerable interest has been shown in the use of a numerical solution of the complete equations of free surface flow to synthesize the unsteady channel and overland flow conditions that occur during a period of runoff. The advantage of this approach is that it provides a logical description of the phenomenon of local inflows entering along a stream flowing at either subcritical or supercritical velocities. This paper shows the feasibility of the approach by comparing the hydrographs and water surface profiles obtained from a numerical solution of the equations with those produced by introducing time varied and spatially varied lateral inflows along the length of a 72‐foot‐long experimental flume. One of the practical problems found with the numerical technique was a sensitivity to errors in the value of the Manning n used to describe the channel roughness. The difficulties imposed by this sensitivity are discussed and compared with the problems associated with traditional routing methods. (Key words: Flood routing; hydraulics; computers, digital; synthesis.) http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Water Resources Research Wiley

Laboratory evaluation of a numerical flood routing technique for channels subject to lateral inflows

Ragan, Robert M.
Water Resources Research , Volume 2 (1) – Mar 1, 1966
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References (2)

Publisher
Wiley
Copyright
Copyright © 1966 by the American Geophysical Union.
ISSN
0043-1397
eISSN
1944-7973
DOI
10.1029/WR002i001p00111
Publisher site
See Article on Publisher Site

Abstract

As a result of advances in high speed digital computers, considerable interest has been shown in the use of a numerical solution of the complete equations of free surface flow to synthesize the unsteady channel and overland flow conditions that occur during a period of runoff. The advantage of this approach is that it provides a logical description of the phenomenon of local inflows entering along a stream flowing at either subcritical or supercritical velocities. This paper shows the feasibility of the approach by comparing the hydrographs and water surface profiles obtained from a numerical solution of the equations with those produced by introducing time varied and spatially varied lateral inflows along the length of a 72‐foot‐long experimental flume. One of the practical problems found with the numerical technique was a sensitivity to errors in the value of the Manning n used to describe the channel roughness. The difficulties imposed by this sensitivity are discussed and compared with the problems associated with traditional routing methods. (Key words: Flood routing; hydraulics; computers, digital; synthesis.)

Journal

Water Resources Research – Wiley

Published: Mar 1, 1966

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