Field studies of fishways in Alberta

1992 ◽  
Vol 19 (4) ◽  
pp. 627-638 ◽  
Author(s):  
N. Rajaratnam ◽  
C. Katopodis ◽  
R. Paccagnan
Keyword(s):  
Key Words ◽  
Channel Flow ◽  
Open Channel ◽  
Open Channel Flow ◽  
Field Studies ◽  
Hydraulic Characteristics ◽  
General Picture ◽  
Vertical Slot ◽  
Scale Models ◽  
Made In

This paper presents a detailed account of field studies performed on one pool-weir and several Denil and vertical slot fishways in the province of Alberta. The pictures show the broad features of the flow. The velocity profiles obtained in the field studies have confirmed the measurements made in the laboratory on scale models and have enhanced the general picture, particularly for the vertical slot fishways. This paper provides hydraulic engineers with information for understanding the primary hydraulic characteristics of fishways. Key words: fishways, field studies, hydraulics, open-channel flow, turbulent flow.

New designs for vertical slot fishways

1992 ◽  
Vol 19 (3) ◽  
pp. 402-414 ◽  
Author(s):  
N. Rajaratnam ◽  
C. Katopodis ◽  
S. Solanki
Keyword(s):  
Experimental Study ◽  
Turbulent Flow ◽  
Key Words ◽  
Channel Flow ◽  
Open Channel ◽  
Open Channel Flow ◽  
Slot Width ◽  
Satisfactory Performance ◽  
Vertical Slot ◽  
Hydraulic Design

This paper presents the results of an experimental study on 18 designs of vertical slot fishways. Based on these results, it appears that a width of 8b0 and a length of 10b0 for the pools, where b0 is the slot width, are satisfactory, and minor variations can be made to these dimensions without affecting their satisfactory performance. In the two general groups of designs, design 6 in the first group and designs 16 and 18 in the second group are recommended for practical use. Key words: fishways, hydraulics, turbulent flow, open-channel flow, hydraulic design.

Hydraulics of offset baffle culvert fishways

1988 ◽  
Vol 15 (6) ◽  
pp. 1043-1051 ◽  
Author(s):  
N. Rajaratnam ◽  
C. Katopodis ◽  
S. Lodewyk
Keyword(s):  
Experimental Study ◽  
Velocity Field ◽  
Turbulent Flow ◽  
Key Words ◽  
Channel Flow ◽  
Open Channel ◽  
Open Channel Flow ◽  
Flow Equation

This paper presents the results of an experimental study on the hydraulics of culverts with offset baffles to pass fish. Using analytical considerations and experimental observations, a flow equation has been developed between the discharge, diameter, depth, and slope for a culvert fish way with the standard offset baffle system. The velocity field at the slot has also been evaluated. Some further experiments were performed to assess the effect of baffle spacing and height on the hydraulics of the culvert fishway. Key words: culverts, fishways, baffles, hydraulics, open-channel flow, turbulent flow.

Head losses at manholes with a 90° bend

1988 ◽  
Vol 15 (5) ◽  
pp. 851-858 ◽  
Author(s):  
J. Marsalek ◽  
B. J. Greck
Keyword(s):  
Key Words ◽  
Channel Flow ◽  
Open Channel ◽  
Open Channel Flow ◽  
Head Loss ◽  
Pipe Diameter ◽  
Head Losses ◽  
Junction Geometry ◽  
Pressure Changes

Head and pressure changes were studied at manholes with a 90° bend. For pressurized flow, such changes depend only on junction geometry. Among junction parameters, the benching was found particularly important. Full benchings reaching to the pipe crown produced the lowest head losses, particularly when combined with an enlarged pipe diameter at the junction. Head changes in open-channel flow were significantly smaller than those in pressurized flow. Key words: head loss, manholes, sewer junctions, sewer design, sewer hydraulics.

Lax-Wendroff and McCormack Schemes for Numerical Simulation of Unsteady Gradually and Rapidly Varied Open Channel Flow

2014 ◽  
Vol 60 (1-4) ◽  
pp. 51-62 ◽  
Author(s):  
Justyna Machalinska-Murawska ◽  
Michał Szydłowski
Keyword(s):  
Channel Flow ◽  
Open Channel ◽  
Open Channel Flow ◽  
Hydraulic Characteristics ◽  
Flood Wave ◽  
One Dimensional ◽  
Explicit Schemes ◽  
Surface Water Flow ◽  
Wave Propagation Problem ◽  
Saint Venant Equations

Abstract Two explicit schemes of the finite difference method are presented and analyzed in the paper. The applicability of the Lax-Wendroff and McCormack schemes for modeling unsteady rapidly and gradually varied open channel flow is investigated. For simulation of the transcritical flow the original and improved McCormack scheme is used. The schemes are used for numerical solution of one dimensional Saint-Venant equations describing free surface water flow. Two numerical simulations of flow with different hydraulic characteristics were performed - the first one for the extreme flow of the dam-break type and the second one for the simplified flood wave propagation problem. The computational results are compared to each other and to arbitrary solutions.

An experimental study of jet dilution in crossflows

1992 ◽  
Vol 19 (5) ◽  
pp. 733-743 ◽  
Author(s):  
John E. Hodgson ◽  
N. Rajaratnam
Keyword(s):  
Experimental Study ◽  
Key Words ◽  
Channel Flow ◽  
Open Channel ◽  
Open Channel Flow ◽  
Field Observations ◽  
Environmental Hydraulics ◽  
General Correlation

This paper presents the results of an experimental study on the dilution produced in jets discharged into crossflows. A general correlation has been developed to predict the centreline dilution. This relation has been found to agree reasonably well with field observations. It has also been possible to predict the growth of the width and the thickness of the deflected jet. This paper would be useful in the design of submerged outfalls in rivers. Key words: jets, crossflows, dilution, open channel flow, environmental hydraulics.

Hydraulics of culvert fishways V: Alberta fish weirs and baffles

1990 ◽  
Vol 17 (6) ◽  
pp. 1015-1021 ◽  
Author(s):  
N. Rajaratnam ◽  
C. Katopodis ◽  
M. A. Fairbairn
Keyword(s):  
Turbulent Flow ◽  
Key Words ◽  
Channel Flow ◽  
Laboratory Study ◽  
Open Channel ◽  
Open Channel Flow ◽  
Hydraulic Performance ◽  
The Other ◽  
Other Hand ◽  
Flow Hydraulics

This paper presents the results of a laboratory study of the hydraulic performance of fish weirs and fish baffles used by Alberta Transportation for improving the fish-passing capacity of culverts. It was found that if the longitudinal spacing of the weirs is limited to 0.6 and 1.2 times the diameter of the culvert, their performance is comparable to that of the corresponding weir and slotted-weir baffle systems, with regard to the depth of pool between the baffles as well as the barrier velocity. On the other hand, the fish baffles did not perform as well as the fish weirs under the conditions tested. Key words: culverts, fishways, baffles, turbulent flow, hydraulics, open-channel flow.

Trapezoidal side-channel spillways

1985 ◽  
Vol 12 (4) ◽  
pp. 774-781 ◽  
Author(s):  
Willi H. Hager
Keyword(s):  
Key Words ◽  
Channel Flow ◽  
Open Channel ◽  
Open Channel Flow ◽  
Side Channel ◽  
Steady Flows ◽  
Flow Discharge

Steady flows in trapezoidal, prismatic side-channel spillways are analysed using a hydraulic approach. Distinction between channels of small and moderate bottom slopes is made. All results are presented in typical nondimensional quantities, by which an immediate application is made possible. Key words: open channel flow, spillway, gradually varied flow, discharge supply, hydraulics.

Hydraulics of culvert fishways IV: spoiler baffle culvert fishways

1991 ◽  
Vol 18 (1) ◽  
pp. 76-82 ◽  
Author(s):  
N. Rajaratnam ◽  
C. Katopodis ◽  
S. Lodewyk
Keyword(s):  
Experimental Study ◽  
Turbulent Flow ◽  
Key Words ◽  
Channel Flow ◽  
Flow Rate ◽  
Open Channel ◽  
Open Channel Flow ◽  
Flow Depth

This paper presents the results of an experimental study on the hydraulics of culvert fishways with spoiler baffles. Four designs were studied with the heights of the baffles equal to 0.09D and 0.15D and longitudinal spacings of 0.53D and 1.06D, where D is the diameter of the culvert. Design equations have been developed relating the flow depth to the flow rate, the diameter and the slope of the culvert for each baffle design. Expressions have also been found for the barrier velocity. Key words: culverts, fishways, hydraulics, turbulent flow, open-channel flow.

Sign in / Sign up

Export Citation Format

Share Document