Date of Award:

8-2014

Document Type:

Dissertation

Degree Name:

Doctor of Philosophy (PhD)

Department:

Civil and Environmental Engineering

Committee Chair(s)

Blake P. Tullis

Committee

Blake P. Tullis

Committee

Steven L. Barfuss

Committee

Michael C. Johnson

Committee

Gary P. Merkley

Committee

William J. Rahmeyer

Abstract

Culverts have traditionally been designed to a minimal size to pass a specific design flood. The traditional culvert designs may result in a localized increase in velocity which can result in a blockage of animal or fish movement across a barrier effectively changing the ecosystem surrounding a number of affected species. While hydraulic loss coefficients are relatively well defined for such traditional culverts, the National Cooperative Highway Research Program (NCHRP) identified a need for further study of these coefficients for culverts more conducive to fish and animal passage.

A research team headed by Dr. Blake Tullis of Utah State University was contracted by the NCHRP to conduct physical, numerical, and computer modeling to conduct research to be used to refine the methods used to define hydraulic coefficients involved in the design of culverts more sensitive to the surrounding environment. This dissertation was conducted as a portion of that overall program and focuses on the hydraulic coefficient Manning’s (n) which is used to quantify the reaction of flow characteristics to the friction caused by the roughness of the surrounding channel. A project was conducted at the Utah Water Research Lab (UWRL) in order to better define Manning’s n specifically for open channel applications which would be found in fish passage culverts as part of an overall $575,000 project.

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