Effectiveness of Small Onshore Seawall in Reducing Forces Induced by Tsunami Bore: Large Scale Experimental Study

2009 ◽  
Vol 4 (6) ◽  
pp. 382-390 ◽  
Author(s):  
Mary Elizabeth Oshnack ◽  
◽  
Francisco Aguíñiga ◽  
Daniel Cox ◽  
Rakesh Gupta ◽  
...  
Keyword(s):  
Experimental Study ◽  
Large Scale ◽  
Rigid Wall ◽  
Wave Profile ◽  
Small Individual ◽  
Wave Flume ◽  
Pressure Distributions ◽  
Field Reconnaissance ◽  
Wave Heights ◽  
Wire Resistance

Tsunami force and pressure distributions on a rigid wall fronted by a small seawall were determined experimentally in a large-scale wave flume. Six different seawall heights were examined, two of which were exposed to a range of solitary wave heights. The same experiment was done without a seawall for comparison. The measured wave profile contained incident offshore, incident broken, reflected broken, and transmitted wave heights measured using wire resistance and ultrasonic wave gauges. Small individual seawalls increased reflection of the incoming broken bore front and reduced force on the rigid landward wall. These findings agree well with published field reconnaissance on small seawalls in Thailand that showed a correlation between seawalls and reduced damage on landward structures.

An Experimental Study and Analysis of Turbulent Film Tilted Pad Bearings

1974 ◽  
Vol 96 (1) ◽  
pp. 168-173 ◽  
Author(s):  
R. A. Burton ◽  
H. J. Carper ◽  
Y. C. Hsu
Keyword(s):  
Experimental Study ◽  
Turbulent Flow ◽  
Large Scale ◽  
Velocity Profiles ◽  
Working Fluid ◽  
Pressure Distributions ◽  
Aspect Ratios

Velocity profiles and pressure distributions are reported for turbulent flow under tilted pads in a large scale bearing model (6-ft shaft size, with air as the working fluid). Results are extended analytically to other bearing sizes and aspect ratios.

Experimental Study of Scour Due to Breaking Waves in Front of Vertical-Wall Breakwaters

2004 ◽  
Author(s):  
Ali Hasanzadeh Daloui ◽  
Mirmosadegh Jamali
Keyword(s):  
Experimental Study ◽  
Empirical Equation ◽  
Vertical Wall ◽  
Breaking Waves ◽  
Scour Depth ◽  
Regular Waves ◽  
Factors Affecting ◽  
Wave Flume ◽  
Wave Heights

Scour is an important cause of instability of breakwaters. In case of vertical-wall breakwaters, toe scour can cause collapse of the whole structure. This paper is concerned with an experimental study of the effects of regular breaking waves on scour at toe of vertical-wall breakwaters. Experiments were carried out in a wave flume with regular waves for two cases of a beach with and without a breakwater. Bed profiles and scour depths for various wave heights, periods and depths were recorded. For the case of a beach without a breakwater, the observed bed profile types are compared to predictions. For the case of a beach with a breakwater, factors affecting the scour are investigated, and an empirical equation for scour depth at toe of a vertical wall is proposed.

An Experimental Study of Annular Flows With Applications in Turbulent Film Lubrication

1967 ◽  
Vol 89 (3) ◽  
pp. 381-391 ◽  
Author(s):  
R. A. Burton ◽  
H. J. Carper
Keyword(s):  
Experimental Study ◽  
Shear Stress ◽  
Turbulent Flows ◽  
Large Scale ◽  
Journal Bearings ◽  
Major Influence ◽  
Plane Couette Flow ◽  
Pressure Distributions ◽  
Large Pressure ◽  
Film Lubrication

Experiments are reported on turbulent flows in air, in a large-scale bearing model of 6-ft dia, 2-ft length, 0.54-in. film thickness. Simulation of tilted pads, short journal bearings, and stepped pads is described. Pressure distributions are reported along with velocity and turbulence-intensity profiles. Wall shear stress is computed from the velocity profile measurements. The variations of these factors are compared with available data for plane Couette flow, wall law flow, and pressure flow in pipes, and the relationships among these are discussed. In addition, large pressure jumps at discontinuities are reported, and are shown to provide a major influence on the overall pressure distributions.

Experimental study of deformation processes in large-scale concrete structures under quasistatic loading

2020 ◽  
Vol 15 (5) ◽  
pp. 619-633
Author(s):  
Igor Shardakov ◽  
Irina Glot ◽  
Aleksey Shestakov ◽  
Roman Tsvetkov ◽  
Valeriy Yepin ◽  
...  
Keyword(s):  
Experimental Study ◽  
Large Scale ◽  
Concrete Structures ◽  
Deformation Processes ◽  
Quasistatic Loading

Experimental study on particle breakage of carbonate gravels under cyclic loadings through Large-scale triaxial tests

2021 ◽  
pp. 100632
Author(s):  
Zhigang Cao ◽  
Jiaji Chen ◽  
Xingchi Ye ◽  
Chuan Gu ◽  
Zhen Guo ◽  
...  
Keyword(s):  
Experimental Study ◽  
Large Scale ◽  
Particle Breakage ◽  
Triaxial Tests

Experimental study of rotating wind turbine breakdown characteristics in large scale air gaps

2017 ◽  
Vol 19 (6) ◽  
pp. 064016 ◽  
Author(s):  
Yu WANG ◽  
Lu QU ◽  
Tianjun SI ◽  
Yang NI ◽  
Jianwei XU ◽  
...  
Keyword(s):  
Experimental Study ◽  
Wind Turbine ◽  
Large Scale ◽  
Air Gaps

scholarly journals Large-Scale Laboratory Experiments on Mussel Dropper Lines in Ocean Surface Waves

2020 ◽  
Vol 9 (1) ◽  
pp. 29
Author(s):  
Rebekka Gieschen ◽  
Christian Schwartpaul ◽  
Jannis Landmann ◽  
Lukas Fröhling ◽  
Arndt Hildebrandt ◽  
...  
Keyword(s):  
Large Scale ◽  
Laboratory Experiments ◽  
Blue Mussel ◽  
Farming Systems ◽  
Quality Parameter ◽  
Large Wave ◽  
Marine Aquaculture ◽  
Ocean Surface Waves ◽  
Wave Flume ◽  
Waves And Currents

The rapid growth of marine aquaculture around the world accentuates issues of sustainability and environmental impacts of large-scale farming systems. One potential mitigation strategy is to relocate to more energetic offshore locations. However, research regarding the forces which waves and currents impose on aquaculture structures in such conditions is still scarce. The present study aimed at extending the knowledge related to live blue mussels (Mytilus edulis), cultivated on dropper lines, by unique, large-scale laboratory experiments in the Large Wave Flume of the Coastal Research Center in Hannover, Germany. Nine-months-old live dropper lines and a surrogate of 2.0 m length each are exposed to regular waves with wave heights between 0.2 and 1.0 m and periods between 1.5 and 8.0 s. Force time histories are recorded to investigate the inertia and drag characteristics of live mussel and surrogate dropper lines. The surrogate dropper line was developed from 3D scans of blue mussel dropper lines, using the surface descriptor Abbott–Firestone Curve as quality parameter. Pull-off tests of individual mussels are conducted that reveal maximum attachment strength ranges of 0.48 to 10.55 N for mussels that had medium 3.04 cm length, 1.60 cm height and 1.25 cm width. Mean drag coefficients of CD = 3.9 were found for live blue mussel lines and CD = 3.4 for the surrogate model, for conditions of Keulegan–Carpenter number (KC) 10 to 380, using regular wave tests.

Sign in / Sign up

Export Citation Format

Share Document