Effects of Roughness Density on the Determination of Flow Resistance in Spatially Averaged Vegetated Open Channel Flow

2012 ◽  
Author(s):  
Nadeesha Dharmasiri ◽  
Shu-Qing Yang ◽  
Yu Han
Keyword(s):  
Channel Flow ◽  
Flow Resistance ◽  
Open Channel ◽  
Open Channel Flow

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 Use of conventional flow resistance equations and a model for the Nikuradse roughness in vegetated flows at high submergence

2018 ◽  
Vol 66 (1) ◽  
pp. 107-120 ◽  
Author(s):  
Paola Gualtieri ◽  
Sergio De Felice ◽  
Vittorio Pasquino ◽  
Guelfo Pulci Doria
Keyword(s):  
Experimental Data ◽  
Channel Flow ◽  
Flow Resistance ◽  
Open Channel ◽  
Open Channel Flow ◽  
Experimental Methodology ◽  
Flow Depth ◽  
Vegetation Height ◽  
Rigid Vegetation ◽  
Grain Roughness

Abstract This study examines the problem of flow resistance due to rigid vegetation in open channel flow. The reliability of the conventional flow resistance equations (i.e. Keulegan, Manning and Chézy-Bazin) for vegetated flows at high submergence, i.e. h/k >5, (where h = flow depth and k = vegetation height) is assessed. Several modern flow resistance equations based on a two-layer approach are examined, showing that they transform into the conventional equations at high submergences. To compare the conventional flow resistance equations at high submergences, an experimental methodology is proposed and applied to the experimental data reported in the literature and collected for this study. The results demonstrate the reliability of the Keulegan equation in predicting the flow resistance. Based on the obtained results, a model to evaluate the Nikuradse equivalent sand-grain roughness, kN, starting from the vegetation height and density, is proposed and tested.

scholarly journals Imprints In Silica Grains Induced During An Open-Channel Flow Experiment: Determination of Microtextural Signatures During Aqueous Transport

2017 ◽  
Vol 87 (7) ◽  
pp. 677-687 ◽  
Author(s):  
Pedro J.M. Costa ◽  
Yong Sung Park ◽  
Young Do Kim ◽  
Maria Quintela ◽  
William C. Mahaney ◽  
...  
Keyword(s):  
Channel Flow ◽  
Open Channel ◽  
Open Channel Flow ◽  
Flow Experiment
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