Physical Habitat Simulation and the Moveable Bedby Robert T. Milhous, Colorado State Univ, Fort Collins, CO, USA,
Jeffrey B. Bradley, Colorado State Univ, Fort Collins, CO, USA,
Abstract: One objective of an instream flow analysis is to quantify a flow that will maintain the existing channel and/or flush fine material from the bed. Five empirical approaches to determine flushing and channel maintenance flows are discussed. The five methods were applied to the same reach of river and instream flow needs determined were between 142 and 800 cfs depending on the method. A flushing flow method based on physical processes is developed which determines a flushing flow on the basis of the shear stress on the bed and the nature of the fine material deposited in or on the bed.
Subject Headings: Instream flow | Bed materials | River flow | Flow simulation | Channel flow | Flushing | Shear stress | Hydrologic models
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