IAHR, founded in 1935, is a worldwide independent member-based organisation of engineers and water specialists working in fields related to the hydro-environmental sciences and their practical application. Activities range from river and maritime hydraulics to water resources development and eco-hydraulics, through to ice engineering, hydroinformatics, and hydraulic machinery.
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You are here : eLibrary : IAHR World Congress Proceedings : 34th Congress - Brisbane (2011) : THEME 1: Extremes and Variability : Streamflow rating curves during floods
Streamflow rating curves during floods
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The typical procedure to estimate stream discharges entails constructing a one-to-one relationship (a.k.a rating curve) based on set of direct discharge measurements. The direct measurements are typically acquired several times over the year. The one-to-one rating curve is only valid for steady flows. For unsteady flows, such as flood wave propagation, this relationship takes the shape of a loop curve. The advent of modern instrumentation allows acquiring discharge measurements at a considerably faster pace than with conventional instruments. The paper reports direct discharge measurements taken during an epic flood using an image-based technique for quantifying the velocity at the free surface. Velocities were acquired simultaneously with depth measurements with a temporal resolution commensurate with the travel time of flood such that the loop curve was successfully captured. The paper illustrates the differences between the discharges estimated with the one to-one rating curve and those obtained with direct discharge measurements
File Size : 881,397 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 34th Congress - Brisbane (2011)
Article : THEME 1: Extremes and Variability
Date Published : 07/08/2012
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