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.
Log On
About IAHRDirectoryCommitteesMy IAHRNews & JournalseLibraryeShopEventsJoin IAHRWorld CongressDonate
spacer.gif eLibrary
spacer.gif eLibrary
You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Special sessions : Considerations on discharge estimation using index-velocity rating curves
Considerations on discharge estimation using index-velocity rating curves
Horizontal- Acoustic Doppler Current Profilers (H-ADCP) in conjunction with the index-velocity method are extensively used
for replacing the conventional stage-discharge for computing continuous records of discharge in natural streams. The index
velocity-velocity is recommended over the stage-discharge method for inland river gaging sites where backwater or unsteady
flows can occur (e.g., confluences, in the vicinity of hydraulic structures). Previous comparisons of discharge estimates
provided by stage-discharge and index-velocity Rating Curves with simultaneous transect ADCP measurements in unsteady
flows conditions suggest that the magnitude of the deviations from the direct measurements are much reduced for indexvelocity
RC (IVRC) compared to stage-discharge RC (HQRC). This is mainly attributable to the fact that IVRC relies on two
direct measurements (stage and velocity along a cross section) vs just one direct measurement in HQRC, hence the flow
dynamics are better captured with the first measurement approach. This paper reports new experimental evidence on
discharge determination downstream from a dam with frequent and rapid flow changes as documented with four alternative
real-time discharge monitoring methods. Findings inferred from the new set of measurements in steady and unsteady flows
complement those from prior investigations and offer additional insights into the potential causes of the differences between
various discharge measurement methods
File Size : 1,298,184 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Special sessions
Date Published : 19/08/2015
Download Now