Behavior of a finite disturbance in a mobile bed stream

2004 ◽  
pp. 197-203
Author(s):  
Michele Iervolino ◽  
Angelo Leopardi
Keyword(s):  
Mobile Bed ◽  
Finite Disturbance

scholarly journals Discharge estimation in compound channels with fixed and mobile bed

Sadhana ◽  
2009 ◽  
Vol 34 (6) ◽  
pp. 923-945 ◽  
Author(s):  
Galip Seckin ◽  
Mustafa Mamak ◽  
Serter Atabay ◽  
Mazen Omran
Keyword(s):  
Compound Channels ◽  
Mobile Bed ◽  
Discharge Estimation

Riprap Performance at Bridge Piers Under Mobile-Bed Conditions

1998 ◽  
Vol 1647 (1) ◽  
pp. 27-33 ◽  
Author(s):  
Carlos Toro-Escobar ◽  
Richard Voigt ◽  
Bruce Melville ◽  
Meng Chiew ◽  
Gary Parker
Keyword(s):  
Experimental Tests ◽  
Bridge Piers ◽  
Design Criteria ◽  
Research Groups ◽  
Clear Water ◽  
Pier Scour ◽  
Mobile Bed ◽  
Water Conditions ◽  
Improved Design ◽  
Flood Flow

Design criteria for riprap at bridge piers in rivers is based on the specification of a size, gradation, and cover that does not fail under an appropriately chosen flood flow. Experimental tests of riprap performance at bridge piers to date have relied on a configuration for which the ambient bed is not mobilized, that is, clear-water conditions. In the field, however, riprap is, as a rule, subjected to mobile-bed conditions during floods. Recent experiments by three cooperating research groups (University of Auckland, Nanyang University, and St. Anthony Falls Laboratory) indicate a heretofore unrecognized mechanism for riprap failure under mobile-bed conditions. When the flow is in the dune regime, the passage of successive dunes causes riprap that is never directly entrained by the flow to sink and disperse. Pier scour is realized as a consequence of these processes. In some cases, the depth of scour realized is not significantly less than that which would occur without riprap. When the riprap is fully underlain by a geotextile, edge effects can cause local removal of riprap, upturning of the geotextile, and general failure. When the riprap is underlain by a partial geotextile (i.e., one that covers an area less than the riprap), edge scour causes local sinking that anchors the geotextile. The sinking and dispersion of the rest of the riprap are greatly limited, and the riprap fails only when flow velocities are sufficient for direct entrainment. The experiments suggest improved design criteria for the installation of riprap in the field.

scholarly journals Mobile bed fluvial mathematical models

1973 ◽  
pp. 561-580 ◽  
Author(s):  
J. A. CUNGE ◽  
N. PERDREAU
Keyword(s):  
Mathematical Models ◽  
Mobile Bed

Behaviour of small perturbations in 1D mobile-bed models

2004 ◽  
pp. 67-73 ◽  
Author(s):  
G Rosatti ◽  
L Fraccarollo ◽  
A Armanini
Keyword(s):  
Small Perturbations ◽  
Mobile Bed

Stage-discharge modelling in mobile bed compound channel

2006 ◽  
Author(s):  
S Atabay ◽  
D Bousmar ◽  
Y Zech ◽  
D Knight
Keyword(s):  
Compound Channel ◽  
Mobile Bed

Numerical simulation of 2D dam break on mobile bed

2006 ◽  
Author(s):  
A Leopardi ◽  
M Iervolino ◽  
M Greco
Keyword(s):  
Numerical Simulation ◽  
Dam Break ◽  
Mobile Bed

scholarly journals SIMILARITY OF EQUILIBRIUM BEACH PROFILES

1972 ◽  
Vol 1 (13) ◽  
pp. 61 ◽  
Author(s):  
M.J. Paul ◽  
J.W. Kamphuis ◽  
A. Brebner
Keyword(s):  
Long Range ◽  
Scale Effect ◽  
Research Laboratory ◽  
Scaling Laws ◽  
Coastal Engineering ◽  
Two Dimensional ◽  
Engineering Research ◽  
Mobile Bed ◽  
Beach Processes ◽  
Distorted Model

In the design of mobile bed coastal models it is inherently assumed that prototype beach processes may be modelled using lightweight sediment. At the Queen's University Coastal Engineering Research Laboratory, a long range project is currently in progress to determine scaling laws and scale effect for mobile bed coastal models. A large portion of this program is directly concerned with beach profiles and in this paper preliminary work is reported, in which a comparison is made between two dimensional laboratory beach profiles obtained from controlled "prototype", undistorted model and some distorted model tests.

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