Controlling sand placement during the building of artificial islands

1984 ◽  
Vol 21 (2) ◽  
pp. 371-375 ◽  
Author(s):  
D. H. Shields ◽  
L. Domaschuk ◽  
D. W. Corkal ◽  
J. R. McCutchon
Keyword(s):  
Cost Saving ◽  
Low Cost ◽  
Model Tests ◽  
Scale Model ◽  
Small Scale ◽  
Considerable Cost ◽  
Environmentally Safe ◽  
Considerable Cost Saving ◽  
Small Scale Model

A new way to construct artificial islands of sand is described. The method shows promise of considerable cost saving. The present high cost of island building is due to the difficulty of making underwater sand slopes steep. Simply dumping sand into the ocean results in slopes of from 12 to 15 horizontal to 1 vertical. These shallow slopes have enormous implications in terms of sand volume and cost. The sand can be tremied into place to form a steep-sided ring or bund. Handling large quantities of sand in this way is expensive. Small-scale model tests show that if the sand is mixed with certain chemicals the resulting 'cohesion' enables the sand to fall through seawater as a block, with little dispersion. Steep underwater slopes result. Low-cost, nontoxic (environmentally safe) chemicals were used in the experiment. Keywords: construction, artificial islands, sand, oceans, dredging.

Small‐Scale Model Tests of Structural Steel Assemblies

1989 ◽  
Vol 115 (8) ◽  
pp. 1999-2015 ◽  
Author(s):  
Benjamin J. Wallace ◽  
Helmut Krawinkler
Keyword(s):  
Structural Steel ◽  
Model Tests ◽  
Scale Model ◽  
Small Scale ◽  
Small Scale Model

scholarly journals A High-resolution Aerial System of a New Type

1953 ◽  
Vol 6 (3) ◽  
pp. 272 ◽  
Author(s):  
BY Mills ◽  
AG Little
Keyword(s):  
High Resolution ◽  
Radio Astronomy ◽  
Small Area ◽  
Low Cost ◽  
Scale Model ◽  
Small Scale ◽  
New Type ◽  
Small Scale Model

A method of constructing an aerial system of high resolution but small area and low cost is described. Its application to the production of narrow pencil beams at metre wavelengths for investigations in radio astronomy is discussed. A small-scale model has been constructed to test the principle.

Pipeline plough performance in sand waves. Part 1: model testing

2010 ◽  
Vol 47 (1) ◽  
pp. 49-64 ◽  
Author(s):  
Mark Fraser Bransby ◽  
Michael Brown ◽  
Andrew Hatherley ◽  
Keith Lauder
Keyword(s):  
Model Testing ◽  
Model Tests ◽  
Scale Model ◽  
Soil Conditions ◽  
Small Scale ◽  
Offshore Pipelines ◽  
Sand Waves ◽  
Increased Risk ◽  
Small Scale Model ◽  
Spoil Heaps

Offshore pipelines are often buried in the seabed by ploughing a trench, placing the pipe at the base, and then backfilling. The ploughing operation is critical in terms of cost and project time, with increased risk due to uncertain soil conditions or geohazards. One problem that can be encountered is the presence of sand waves or megaripples on the seabed surface. This may affect the progress of the plough, prevent the plough from generating a level trench or modify the size of the spoil heaps for backfilling. These aspects have been investigated by conducting a series of small-scale model tests in the laboratory. These have revealed information about the plough kinematics and the resulting trench conditions when ploughing in sand waves with different wavelengths and amplitudes. It is shown that it may be possible to plough through regions of sand waves and estimate likely plough performance by knowing the sand wavelength and amplitude relative to the plough size.

Wave overtopping and splash-up at seawalls with bullnose

2020 ◽  
Vol 20 (3) ◽  
pp. 333-342
Author(s):  
Le Hai Trung ◽  
Dang Thi Linh ◽  
Tang Xuan Tho ◽  
Nguyen Truong Duy ◽  
Tran Thanh Tung
Keyword(s):  
Storm Surges ◽  
Model Tests ◽  
Scale Model ◽  
Small Scale ◽  
Wave Overtopping ◽  
Run Up ◽  
Coast Of Vietnam ◽  
Small Scale Model ◽  
Wall Interactions

Seawalls have been erected to protect hundreds of towns and tourism areas stretching along the coast of Vietnam. During storm surges or high tides, wave overtopping and splash-up would often threaten the safety of infrastructures, traffic and residents on the narrow land behind. Therefore, this study investigates these wave-wall interactions via hydraulic small scale model tests at Thuyloi University. Remarkably, the structure models were shaped to have different seaward faces and bullnoses. The wave overtopping discharge and splash run-up height at seawalls with bullnose are significantly smaller than those without bullnose. Furthermore, the magnitude of these decreasing effects is quantitatively estimated.

Prototype measurements and small-scale model tests of wave overtopping at shallow rubble-mound breakwaters: the Ostia-Rome yacht harbour case

2009 ◽  
Vol 56 (2) ◽  
pp. 154-165 ◽  
Author(s):  
Leopoldo Franco ◽  
Jimmy Geeraerts ◽  
Riccardo Briganti ◽  
Marc Willems ◽  
Giorgio Bellotti ◽  
...  
Keyword(s):  
Model Tests ◽  
Scale Model ◽  
Small Scale ◽  
Wave Overtopping ◽  
Rubble Mound ◽  
Rubble Mound Breakwaters ◽  
Small Scale Model

scholarly journals Run-up on vertical piles due to regular waves: Small-scale model tests and prediction formulae

2016 ◽  
Vol 118 ◽  
pp. 1-11 ◽  
Author(s):  
Lisham Bonakdar ◽  
Hocine Oumeraci ◽  
Amir Etemad-Shahidi
Keyword(s):  
Model Tests ◽  
Scale Model ◽  
Small Scale ◽  
Regular Waves ◽  
Run Up ◽  
Small Scale Model

The Design Manufacture and Operation of a Model Turbine Test Rig

1984 ◽  
Author(s):  
M. C. Gosling
Keyword(s):  
Low Power ◽  
Low Cost ◽  
Scale Model ◽  
Small Scale ◽  
Ambient Conditions ◽  
Test Rig ◽  
Reliable Performance ◽  
Objective Being ◽  
Small Scale Model ◽  
Design Construction

This paper describes the design, construction and development of a rig that allows small scale model turbines to be tested at near ambient conditions and low power levels. The objective being to obtain reliable performance data quickly and at low cost. The testing of a model turbine, installed in this rig, is described and design details of the turbine are included.

scholarly journals Influence of the Existing Cavern on the Stability of Adjacent Tunnel Excavation by Small-Scale Model Tests

2014 ◽  
Vol 15 (12) ◽  
pp. 117-128
Author(s):  
Minchul Jung ◽  
Jungsoon Hwang ◽  
Jongseob Kim ◽  
Seungwook Kim ◽  
Seungcheol Baek
Keyword(s):  
Model Tests ◽  
Scale Model ◽  
Small Scale ◽  
Tunnel Excavation ◽  
The Stability ◽  
Small Scale Model

Pillar-reinforcement technology beneath existing structures: Small-scale model tests

2014 ◽  
Vol 18 (3) ◽  
pp. 819-826 ◽  
Author(s):  
H. J. Seo ◽  
H. Choi ◽  
K. H. Lee ◽  
G. J. Bae ◽  
I. M. Lee
Keyword(s):  
Model Tests ◽  
Scale Model ◽  
Small Scale ◽  
Existing Structures ◽  
Small Scale Model
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