scholarly journals Unified criterion for clear‐water local scour induced by junction flows and wall jets

2021 ◽  
Author(s):  
N. S. Cheng ◽  
Y. S. Lu ◽  
M. X. Wei ◽  
Y. M. Chiew
Keyword(s):  
Local Scour ◽  
Clear Water ◽  
Wall Jets

Clear Water Local Scour by Submerged Three-Dimensional Wall Jets: Effect of Tailwater Depth

2006 ◽  
Vol 132 (6) ◽  
pp. 575-580 ◽  
Author(s):  
M. A. A. Faruque ◽  
Partha Sarathi ◽  
Ram Balachandar
Keyword(s):  
Three Dimensional ◽  
Local Scour ◽  
Clear Water ◽  
Wall Jets

Clear-water local scour at wide piers in shallow-water flow

2014 ◽  
Vol 9 (3) ◽  
pp. 331-343 ◽  
Author(s):  
N. Ahmad ◽  
T. Mohamed ◽  
F. H. Ali ◽  
B. Yusuf
Keyword(s):  
Laboratory Data ◽  
Local Scour ◽  
The Other ◽  
Scour Depth ◽  
Temporal Development ◽  
Clear Water ◽  
Shallow Water Flow ◽  
Equilibrium Time ◽  
Sediment Size ◽  
Flow Intensity

Laboratory data for local scour depth regarding the size of wide piers are presented. Clear water scour tests were performed for various pier widths (0.06, 0.076, 0.102, 0.14 and 0.165 m), two types of pier shapes (circular and rectangular) and two types of uniform cohesionless bed sediment (d50 = 0.23 and d50 = 0.80 mm). New data are presented and used to demonstrate the effects of pier width, pier shape and sediment size on scour depth. The influence of equilibrium time (te) on scouring processes is also discussed. Equilibrium scour depths were found to decrease with increasing values of b/d50. The temporal development of equilibrium local scour depth with new laboratory data is demonstrated for flow intensity V/Vc = 0.95. On the other hand, the results of scour mechanism have shown a significant relationship between normalized volume of scoured and deposited with pier width, b. The experimental data obtained in this study and data available from the literature for wide piers are used to evaluate predictions of existing methods.

LOCAL SCOUR CAUSED BY SUBMERGED WALL JETS. DISCUSSION ON PAPER 9077.

1987 ◽  
Vol 83 (4) ◽  
pp. 875-886 ◽  
Author(s):  
KHM ALI ◽  
SY LIM ◽  
AJ JOHNSTON ◽  
AR HALLIWELL
Keyword(s):  
Local Scour ◽  
Wall Jets

scholarly journals Local scour at vertical-wall abutments under clear-water flow conditions

2006 ◽  
Vol 42 (10) ◽  
Author(s):  
Cristina Maria Sena Fael ◽  
Gonzalo Simarro-Grande ◽  
Juan-Pedro Martín-Vide ◽  
António Heleno Cardoso
Keyword(s):  
Water Flow ◽  
Vertical Wall ◽  
Local Scour ◽  
Clear Water ◽  
Flow Conditions

scholarly journals Reduction of Local Scour Around A Bridge Pier Using Triple Rectangular Plates

2015 ◽  
Vol 10 (Special-Issue1) ◽  
pp. 47-55 ◽  
Author(s):  
Alireza Arabani ◽  
Human Hajikandi
Keyword(s):  
Water Flow ◽  
Flow Direction ◽  
Side Wall ◽  
Local Scour ◽  
Maximum Efficiency ◽  
Rectangular Plates ◽  
Clear Water ◽  
The Third ◽  
Different Depths ◽  
Lateral Plates

The performance of vertical triple plates as a new countermeasure in control of local scour around a cylindrical model pier is studied. Two ones of the plates are attached to the side wall one of the pier at one pier diameter distance, extending toward upstream distance and the third one is located in the middle, attached to the pier nose. All the three plates are parallel to flow direction. Experiments are conducted for five different depths of flow and two different lengths of the lateral plates, namely 8 and 14 cm. all the runs are performed under the clear water flow over uniform sediment. The results showed a maximum efficiency of 76% in scour reduction for 8 cm long side plates and 85% for 14 cm long ones.it is also found that the proposed setup act simultaneously as both the bed armoring and flow altering countermeasure.

Effect of Reynolds Number on Local Scour Around a Monopile in Steady Current

2019 ◽  
Author(s):  
Xiaofan Lou ◽  
Kaibing Zhang ◽  
Zhenhong Chen
Keyword(s):  
Reynolds Number ◽  
Time Scale ◽  
Time History ◽  
Local Scour ◽  
Circular Cylinders ◽  
Scour Depth ◽  
Clear Water ◽  
Number Range ◽  
Steady Current ◽  
Equilibrium Scour Depth

Abstract The effect of Reynolds number (Re) on the local scour around a monopile encountering steady current was investigated experimentally in a water flume. The experiment was performed using circular cylinders with different diameters under two different freestream velocities, covering both clear-water and live-bed scours and a Reynolds number range of approximately 9,000–60,000. The time-series of the scour depth was recorded during the whole scour process and the scour pit was scanned after the scour process reached equilibrium. Results are presented in terms of the equilibrium scour depth, the time-scale of the scour process and the three-dimensional scour profile at different Reynolds numbers. For both clear-water and live-bed scours, the time history of the scour process indicate that the time-scale becomes larger as Re increases. It is also found that the normalized equilibrium scour depth, as well as the normalized scour radius, decrease with the increasing Re. An empirical equation of the equilibrium scour depth is derived as a function of Reynolds number based on the experimental results so as to better account for Re effect in the scour design.

Temporal Evolution of Clear-Water Local Scour at Aligned and Skewed Complex Bridge Piers

2020 ◽  
Vol 146 (4) ◽  
pp. 04020026 ◽  
Author(s):  
Yifan Yang ◽  
Bruce W. Melville ◽  
Graham H. Macky ◽  
Asaad Y. Shamseldin
Keyword(s):  
Temporal Evolution ◽  
Local Scour ◽  
Bridge Piers ◽  
Clear Water

LOCAL SCOUR CAUSED BY SUBMERGED WALL JETS.

1986 ◽  
Vol 81 (4) ◽  
pp. 607-645 ◽  
Author(s):  
KHM ALI ◽  
SY LIM
Keyword(s):  
Local Scour ◽  
Wall Jets
Sign in / Sign up

Export Citation Format

Share Document