Date of Award

2001

Degree Type

Thesis

Degree Name

M.A.Sc.

Department

Civil and Environmental Engineering

First Advisor

Da Silva, A.

Keywords

Engineering, Mechanical.

Rights

CC BY-NC-ND 4.0

Abstract

This thesis is an extension of the works by Whiting and Dietrich 1993, Silva 1995 and Termini 1995. These authors have found that the initial flow patterns in sine-generated meandering channels are mainly a function of the channels deflection angle theta0. (Initial flow is the flow present in the channel prior to any bed deformation). However, the aforementioned works are restricted to cases of "small" and "large" theta 0; the flow pattern in the small theta0-channels have been termed ingoing and in the large theta0-channels, outgoing. In this thesis the flow patterns in channels having intermediate values of theta 0 were investigated experimentally. The main objectives are: (1 ) to determine the relationship between flow patterns and plan shape, for the purpose of determining the transition region between ingoing and outgoing flow patterns, (2) to develop a database for use by other researchers in the calibration of numerical models. The experiments were carried out in three different channels defined by theta 0 = 90°, 70°, and 50°. The experimental facility was designed to allow for the same recirculating flow system to be used for all channels. The channels themselves were 40cm wide, with a rectangular cross-section. All three channels conveyed a 3--3.2cm deep flow, with flow rates in the range of 1.5 to 2.8 l/s for the purpose of measuring the vertically-averaged longitudinal flow velocity u, deviation angle w&d1;c and flow depth h. It was found that the flow in the 90°-channel was outgoing, while the flow in the 50°-channel was ingoing. These findings were supported by both the deviation angle and velocity measurements. The initial flow in the 70°-channel was found to be neither ingoing nor outgoing, but rather a transitional flow between ingoing and outgoing. A discussion of a possible correlation between the velocity of expansion of a meandering channel and the maximum vertically-averaged deviation angle has also been presented.Dept. of Civil and Environmental Engineering. Paper copy at Leddy Library: Theses & Major Papers - Basement, West Bldg. / Call Number: Thesis2001 .T37. Source: Masters Abstracts International, Volume: 40-03, page: 0775. Adviser: Ana M. F. Da Silva. Thesis (M.A.Sc.)--University of Windsor (Canada), 2001.

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