Case Study: Particle Velocimetry in a Model of Lake Ogallala
Publication: Journal of Hydraulic Engineering
Volume 130, Issue 7
Abstract
In a case study of Lake Ogallala, a reservoir in central Nebraska, large scale particle tracking velocimetry (LSPTV) is used to measure surface velocities in a physical model of the lake. Knowledge of flow patterns in the lake is essential for predicting the transport of dissolved oxygen (DO). A preliminary comparison with acoustic Doppler velocimetery (ADV) measurements shows that both LSPTV and large scale particle image velocimetry (LSPIV) accurately measure surface velocities. In the present study, LSPTV works better near flow boundaries and in regions with high velocity gradients since smaller sampling areas are possible, and unlike LSPIV measurements, LSPTV measurements are unbiased. Discharges measured at eight different transects using LSPTV were within 6% of the discharge measured with an orifice, the worst correlation occurring where the bathymetry was slightly nonuniform (making application of the 1/7-power law suspect). In the prototype, DO content periodically drops to unacceptable levels throughout most of the Keystone Basin (a subbasin of Lake Ogallala). Predicted flow patterns suggest that low DO problems are exacerbated in regions with low velocities since oxygen consumed by macrophytes during nighttime hours is not quickly replenished.
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Information & Authors
Information
Published In
Journal of Hydraulic Engineering
Volume 130 • Issue 7 • July 2004
Pages: 599 - 607
Copyright
Copyright © 2004 American Society of Civil Engineers.
History
Received: Jun 13, 2003
Accepted: Oct 20, 2003
Published online: Jun 15, 2004
Published in print: Jul 2004
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