Reservoir releases for generating power need to be reconciled to
maintain healthy ecosystems in regulated rivers. Fluctuating,
complex flow patterns near river obstructions such as boulders
provide unique habitat for many aquatic organisms. In this book,
the ability of two- and three- dimensional hydraulic models to
reproduce the localized complex flow features at both steady and
unsteady flows is examined. The performance of the hydraulic models
is evaluated by comparing the numerical results with measurements
of flow around boulders located at a reach of the Smith River in
Virginia, U.S.A. Further, time-dependent flow features affecting
channel morphology and aquatic physical habitat are investigated.
Issues related to the adoption of either a truly dynamic modeling
approach or a quasi-steady methodology for simulating unsteady
flows are examined through a proposed unsteadiness flow parameter.
The insights obtained from this study can assist in properly
accounting for the impact of hydropeaking operations on fish
habitat and instream flow management.
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