Isochrones of travel time and distribution of flood storage from a tracer study on a small watershed

Isochrones of travel time and distribution of flood storage from a tracer study on a small watershed In the practical application of many methods of flood hydrograph synthesis it is necessary to space isochrones of travel time over the watershed or to allocate the distribution of storage. The available evidence for guiding this procedure is reviewed, but most information applies to large stream systems and to flows lower than the flood discharges of interest. Times of travel data from tracing of flood runoff on a small watershed have been compared with the evidence from large streams. Average velocities were found to increase slightly in a downstream direction through the watershed, despite decreasing slope. This increase conforms with published hydraulic geometry relationships. Five geomorphological parameters have been tested as methods for spacing isochrones. Field inspection to determine mean depths, and possibly roughness, at bank‐full stages should lead to greatest accuracy, but simple parameters based on stream length also gave good results. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Water Resources Research Wiley

Isochrones of travel time and distribution of flood storage from a tracer study on a small watershed

Water Resources Research, Volume 13 (3) – Jun 1, 1977

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Publisher
Wiley
Copyright
Copyright © 1977 by the American Geophysical Union.
ISSN
0043-1397
eISSN
1944-7973
D.O.I.
10.1029/WR013i003p00587
Publisher site
See Article on Publisher Site

Abstract

In the practical application of many methods of flood hydrograph synthesis it is necessary to space isochrones of travel time over the watershed or to allocate the distribution of storage. The available evidence for guiding this procedure is reviewed, but most information applies to large stream systems and to flows lower than the flood discharges of interest. Times of travel data from tracing of flood runoff on a small watershed have been compared with the evidence from large streams. Average velocities were found to increase slightly in a downstream direction through the watershed, despite decreasing slope. This increase conforms with published hydraulic geometry relationships. Five geomorphological parameters have been tested as methods for spacing isochrones. Field inspection to determine mean depths, and possibly roughness, at bank‐full stages should lead to greatest accuracy, but simple parameters based on stream length also gave good results.

Journal

Water Resources ResearchWiley

Published: Jun 1, 1977

References

  • Use of dye tracers to collect hydrologic data in Oregon
    Harris, Harris; Sanderson, Sanderson
  • Travel times and nonlinearity of flood runoff from tracer measurements on a small watershed
    Pilgrim, Pilgrim

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