Numerical modelling of ice jam resistance to main channel flow

1995 ◽  
Vol 21 (11) ◽  
pp. 1109-1120 ◽  
Author(s):  
Raafat G. Saadé ◽  
Amruthur ◽  
S. Ramamurthy ◽  
Michael S. Troitsky
Keyword(s):  
Numerical Modelling ◽  
Channel Flow ◽  
Main Channel ◽  
Ice Jam ◽  
Jam Resistance

Finite element modeling of surge propagation and an application to the Hay River, N.W.T.

1992 ◽  
Vol 19 (3) ◽  
pp. 454-462 ◽  
Author(s):  
F. E. Hicks ◽  
P. M. Steffler ◽  
R. Gerard
Keyword(s):  
Finite Element ◽  
Channel Flow ◽  
Open Channel ◽  
Initial Conditions ◽  
Open Channel Flow ◽  
Kinematic Wave ◽  
Finite Element Scheme ◽  
Flow Problems ◽  
Ice Jam

This paper describes the application of the characteristic-dissipative-Galerkin method to steady and unsteady open channel flow problems. The robust performance of this new finite element scheme is demonstrated in modeling the propagation of ice jam release surges over a 500 km reach of the Hay River in Alberta and Northwest Territories. This demonstration includes the automatic determination of steady flow profiles through supercritical–subcritical transitions, establishing the initial conditions for the unsteady flow analyses. The ice jam releases create a dambreak type of problem which begins as a very dynamic situation then develops into an essentially kinematic wave problem as the disturbance propagated downstream. The characteristic-dissipative-Galerkin scheme provided stable solutions not only for the extremes of dynamic and kinematic wave conditions, but also through the transition between the two. Key words: open channel flow, finite element method, dam break, surge propagation.

scholarly journals Laboratory Study of Weir Height and Location Effect in a Main Channel on the Branching Channel Flow

2013 ◽  
Vol 21 (4) ◽  
pp. 38-45
Author(s):  
Safiya Usama Ahmed Al-Neelah ◽  
Moayad Sa ◽  
ad Allah Khaleel
Keyword(s):  
Channel Flow ◽  
Laboratory Study ◽  
Main Channel ◽  
Weir Height

Effect of Western the Fourth Phase Project on Hydrodynamic Condition for Shijiu Port in Rizhao

2012 ◽  
Vol 204-208 ◽  
pp. 2369-2373
Author(s):  
Jia Rui Li ◽  
Die Shuang Yu
Keyword(s):  
Channel Flow ◽  
Water Area ◽  
Main Channel ◽  
Hydrodynamic Condition ◽  
Port Area ◽  
Before And After ◽  
Project Construction ◽  
Sheltering Effect ◽  
Sea Area ◽  
Flow Velocities

A hydrodynamic model of Shijiu port and its adjacent sea area was built to discuss the effect of western the fourth phase project on the flow condition for Shijiu port area. The results show that with the sheltering effect of breakwaters, flow velocity values are small inside the breakwaters. The water area near the project is affected more by the project construction. The flow velocities there are faster after the project construction than before it. In the main channel, flow velocities outside the breakwaters almost have no difference before and after the project. The project construction doesn’t have significant effect on it.

Flow through the voids of breakup ice jams

1999 ◽  
Vol 26 (2) ◽  
pp. 177-185 ◽  
Author(s):  
Spyros Beltaos
Keyword(s):  
Numerical Modelling ◽  
River Discharge ◽  
Integral Method ◽  
Laboratory Tests ◽  
Major Portion ◽  
Ice Jams ◽  
Ice Jam ◽  
Flow Through

Flow through the voids of breakup ice jams can be a major portion of the total river discharge, especially where the jam is so thick as to be grounded. Very little information is available on this question; it is derived from laboratory tests or from numerical modelling applications, and there is a discrepancy between respective seepage coefficients. A field program has been carried out to measure the flow through the voids in ice jams by taking advantage of favourable access conditions created by an ice-retention structure on the Credit River. The data obtained during two breakup events are described and an integral method of analysis is developed to identify areas of grounding and determine seepage coefficients. Values of the latter are in agreement with those deduced by numerical modelling.Key words: flow, ice jam, modelling, seepage, voids.

scholarly journals Apparent roughness coefficient in overbank flows

2021 ◽  
Vol 3 (7) ◽  
Author(s):  
João N. Fernandes
Keyword(s):  
Shear Stress ◽  
Channel Flow ◽  
Isotropic Turbulence ◽  
Single Channel ◽  
Main Channel ◽  
Roughness Coefficient ◽  
Compound Channel ◽  
Secondary Currents ◽  
Flow Mechanisms ◽  
Overbank Flows

AbstractOverbank flows occur in alluvial valleys during flood events when the conveyance of main channel of rivers is exceeded. Once floodplains are inundated and the so-called compound channel flow is observed, the faster flow in the main channel interacts with the slower flow in the floodplain featuring a much more pronounced 3D flow structure compared to single channel flow. These flow mechanisms comprise a shear layer near the interface, lateral momentum transfer and strong secondary currents due to the non-isotropic turbulence. This paper starts by giving an overview of the main flow mechanisms in compound channels pointing out the importance of taking into account the apparent shear stress generated between the main channel and the floodplain flows due to the interaction of these flows. A new simple model was developed to include the apparent shear stress concept as a correction of the Manning roughness coefficient of main channel and floodplains. The proposed method for predicting stage–discharge relationships was calibrated and validated by experimental data from several compound channel facilities. A significant improvement in prediction of the compound channel conveyance in comparison with the traditional methods was achieved.

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