Wave Loads of Slender Marine Cylinders Depending on Interaction Effects of Adjacent Cylinders

2006 ◽  
Author(s):  
Uwe Sparboom ◽  
Hocine Oumeraci
Keyword(s):  
Large Scale ◽  
Research Programme ◽  
Basic Research ◽  
Irregular Waves ◽  
Research Centre ◽  
Wave Loads ◽  
Freak Waves ◽  
First Results ◽  
Set Up ◽  
Coastal Research

Within a basic research programme at the Coastal Research Centre (FZK) in Hannover large-scale wave experiments were performed with single vertical and inclined Cylinders (Oumeraci, 2004). Additionally, cylinder groups were investigated with special reference to shelter and amplification effects depending on cylinder spacing. Nonbreaking regular and irregular waves as well as breaking freak waves were generated. The test set-up and some first results of the experiments looking to the maximum wave loads are reported in the paper.

Large-Scale Experiments of Wave-Overtopping Loads on Walls: Layer Thicknesses and Velocities

2018 ◽  
Author(s):  
Lorenzo Cappietti ◽  
Irene Simonetti ◽  
Andrea Esposito ◽  
Maximilian Streicher ◽  
Andreas Kortenhaus ◽  
...  
Keyword(s):  
Large Scale ◽  
Scale Validation ◽  
Irregular Waves ◽  
Scale Model ◽  
Small Scale ◽  
Wave Loads ◽  
Wave Overtopping ◽  
Large Scale Model ◽  
Vertical Walls ◽  
Set Up

Wave-Overtopping loads on vertical walls, such as those located on top of a dike, have been investigated in several small-scale experiments in the past. A large-scale validation for a mild foreshore situation is still missing. Hence the WALOWA (WAve LOads on WAlls) experimental campaign was carried out to address this topic. This paper, first presents a description of the large-scale model, the measurement set-up and the experimental methodologies, then it focuses on the layer thicknesses and velocities of the flows created on the promenade by the wave overtopping. A set of resistive wave gauges, ultrasonic distance sensors and velocimeters have been used to conduct these measurements. Preliminary data analysis and results, related to a 1000 irregular waves long test, are discussed. The momentum flux of these flows is studied and its implications, for the wave-overtopping loads acting on the vertical walls, are highlighted.

Large-Scale Investigations of Geotextile Sandcontainers Used for Scour Protection of Offshore Monopiles Supporting Wind Energy Turbines

2006 ◽  
Author(s):  
Joachim Gru¨ne ◽  
Uwe Sparboom ◽  
Reinold Schmidt-Koppenhagen ◽  
Zeya Wang ◽  
Hocine Oumeraci
Keyword(s):  
Large Scale ◽  
Research Programme ◽  
Scale Model ◽  
Research Centre ◽  
Large Wave ◽  
Wave Channel ◽  
Large Scale Model ◽  
First Results ◽  
The Stability ◽  
Scour Protection

An innovative scour protection for monopile structures was proposed by using geotextile sand containers in a research programme started recently. Large-scale model tests on the stability of such alternative scour protection are being performed in the Large Wave Channel (GWK) of the Coastal Research Centre (FZK). First results are reported from basic test series performed with single geotextile sand containers and container groups with different container weights, varied in sizes and percentages of filling. Further an empirical approach on the stability of sand containers is estimated as a first approximation from the results.

scholarly journals WAVE LOADS ON AND BENEATH BONDED PERMEABLE REVETMENTS

2011 ◽  
Vol 1 (32) ◽  
pp. 17
Author(s):  
Gisa Ludwigs ◽  
Hocine Oumeraci ◽  
Tijl Staal
Keyword(s):  
Large Scale ◽  
Water Structure ◽  
Scale Model ◽  
Research Centre ◽  
Wave Loads ◽  
Large Wave ◽  
Wave Flume ◽  
Large Scale Model ◽  
Wide Range ◽  
Coastal Research

Permeable revetments made of bonded mineral aggregates may increasingly be favoured compared to standard revetments. However, the physical processes associated with the water–structure–soil-interaction for a wide range of wave conditions are still not well understood. Therefore, systematic large-scale model tests have been performed in the Large Wave Flume (GWK) of the Coastal Research Centre (FZK) in Hannover, with the intention of improving the understanding of these processes.

The work of the British School at Athens, 2014–2015

2015 ◽  
Vol 61 ◽  
pp. 34-48
Author(s):  
Catherine Morgan
Keyword(s):  
Social Sciences ◽  
Large Scale ◽  
Fine Arts ◽  
Research Programme ◽  
Research Centre ◽  
Fine Grained ◽  
The Past ◽  
British School ◽  
The Social ◽  
Funded Project

Over the past year the School has delivered a rich and varied research programme combining a range of projects in antiquity, spanning the Palaeolithic to Byzantine periods, science-based archaeology to epigraphy (including the work of the Fitch Laboratory and the Knossos Research Centre), with research in sectors from the fine arts to history and the social sciences (see Map 2).At Knossos, new investigation in the suburb of Gypsadhes, directed by Ioanna Serpetsedaki (23rd EPCA), Eleni Hatzaki (Cincinnati), Amy Bogaard (Oxford) and Gianna Ayala (Sheffield), forms part of Oxford University's ERC-funded project Agricultural Origins of Urban Civilisation. The Gypsadhes excavation features large-scale bioarchaeological research, aimed at providing the fine-grained information necessary to reconstruct the Knossian economy through time.

scholarly journals HYDRAULIC PERFORMANCE OF ELASTOMERIC BONDED PERMEABLE REVETMENTS AND SUBSOIL RESPONSE TO WAVE LOADS

2011 ◽  
Vol 1 (32) ◽  
pp. 22
Author(s):  
Hocine Oumeraci ◽  
Tijl Staal ◽  
Saskia Pfoertner ◽  
Matthias Kudella ◽  
Stefan Schimmels ◽  
...  
Keyword(s):  
Large Scale ◽  
Hydraulic Performance ◽  
Soil Liquefaction ◽  
Scale Model ◽  
Research Centre ◽  
Wave Loads ◽  
Large Scale Model ◽  
Wide Range ◽  
Physically Based ◽  
Run Up

Elastomeric bonded permeable revetments, also called PBA (Polyurethane bonded aggregate) revetments, are highly porous structures made of mineral aggregates (e.g. crushed stones) which are durably and elastically bonded by polyurethane (PU). Despite their numerous advantages as compared to conventional revetments and the large experience available from more than 25 pilot projects, physically-based design formulae to predict their hydraulic performance, wave loading and response are still lacking. Therefore, the present study aims at improving the understanding of the processes involved in the interaction between wave, revetment and foundation, based on large-scale model tests performed in the Coastal Research Centre (FZK), Hannover/Germany, and to provide prediction formulae/diagrams. This paper is focused on the prediction of the hydraulic performance (wave reflection, wave run-up and run-down) and the response of the sand core (pore pressure and effective stress) beneath the revetment for a wide range of wave conditions, including the analysis of an observed failure due to transient soil liquefaction.

Small and Large Scale Experimental Investigations of Wave Loads on a Slender Pile Within Closely Spaced Neighbouring Piles

2014 ◽  
Author(s):  
Lisham Bonakdar ◽  
Hocine Oumeraci
Keyword(s):  
Laboratory Tests ◽  
Large Scale ◽  
Model Tests ◽  
Scale Model ◽  
Research Centre ◽  
Experimental Investigations ◽  
Small Scale ◽  
Wave Loads ◽  
Large Wave ◽  
Wave Flume

Wave loads on a slender pile within a group of piles are studied by means of (i) large-scale laboratory tests carried out in the Large Wave Flume (GWK) of the Coastal Research Centre (FZK) in Hannover, and (ii) small scale experiments performed in 2 m-wide wave flume of Leichtweiss-Institute for Hydraulic Engineering and Water Resources (LWI), in Braunschweig, Germany. The small scale model tests (LWI) were scaled down (1:6.5) by Froude law from the large scale model tests (GWK). Scale and model effects are examined by comparing the results of small and large scale laboratory tests.

JEAN-PHILIPPE RAMEAU: INTERNATIONAL ANNIVERSARY CONFERENCE ST HILDA’S COLLEGE OXFORD, 11–14 SEPTEMBER 2014

2015 ◽  
Vol 12 (2) ◽  
pp. 263-266
Author(s):  
THIERRY FAVIER ◽  
MARIE DEMEILLIEZ
Keyword(s):  
Large Scale ◽  
Research Programme ◽  
Fiftieth Anniversary ◽  
Research Centre ◽  
Multidisciplinary Research ◽  
University Of Oxford ◽  
Formed Part

This conference coincided with the two hundred and fiftieth anniversary of the composer's death and formed part of the Rameau Project, a large-scale multidisciplinary research programme devoted to the operas of Jean-Philippe Rameau, supported by The Oxford Research Centre in the Humanities and directed by Graham Sadler (University of Oxford and Birmingham Conservatoire), Alain Viala (University of Oxford) and Jonathan Williams (University of Oxford).

scholarly journals EXTERNAL AND INTERNAL WAVE SET-UP AT POROUS PBA REVETMENTS ON A SAND FOUNDATION

2012 ◽  
Vol 1 (33) ◽  
pp. 27
Author(s):  
Gisa Foyer ◽  
Hocine Oumeraci
Keyword(s):  
Large Scale ◽  
Wave Length ◽  
Irregular Waves ◽  
Scale Model ◽  
Large Scale Model ◽  
Internal Set ◽  
Deep Water Wave ◽  
Set Up ◽  
The Stability ◽  
Almost All

Wave set-up is generally considered for the stability analysis of beaches, but not or not explicitly for the design of revetments. Based on large-scale model results with regular and irregular waves, it is shown in this paper that this is not justified. For this purpose, the wave set-up on a porous bonded revetment and the related internal set-up in the sand foundation below the revetment are analysed for different breaker types. The results particularly show that (i) considerable set-up values are obtained for almost all breaker types, (ii) a good correlation exists with the deep water wave length for both external and internal set-up and (iii) the internal set-up is significantly affected by the wave set-up on the slope. Empirical formulae for the prediction of the external and internal set-up are also proposed for both regular and irregular waves.

Epidemiology of primary hyperparathyroidism in Russia (the first results from the database of Federal state institution «Endocrinological Research Centre»)

2011 ◽  
Vol 57 (3) ◽  
pp. 3-10 ◽  
Author(s):  
I I Dedov ◽  
N G Mokrysheva ◽  
S S Mirnaia ◽  
L G Rostomian ◽  
E A Pigarova ◽  
...  
Keyword(s):  
Primary Hyperparathyroidism ◽  
Large Scale ◽  
Adult Population ◽  
State Institution ◽  
Epidemiological Studies ◽  
Research Centre ◽  
Federal State ◽  
The Past ◽  
First Results ◽  
Sporadic Disease

To elucidate specific features of epidemiology of various forms of primary hyperparathyroidism (PHPT) in this country using the information about 561 patients accumulated for 19 years in the database of Federal state institution «Endocrinological Research Centre». The incidence of PHPT in Moscow estimated from the database of Endocrinological Research Centre for 2007 was 6.8 per 1 000 000 adult population and the prevalence as per 2009 was 3.1/100 000. These values are significantly lower than those reported by foreign authors. The men to women ratio among the patients with PHPT was 1:8. The disease largely affects subjects at the age from 50 to 60 years. By the year of 2004, the frequency of the mild form of PHPT did not exceed 20% of the total (based on 2002 Consensus criteria). It increased to 37% during the past 5 years. Conservative treatment of PHPT can be recommended to 14% of the patients presenting with sporadic disease and to 32% of those with MEN syndrome. The frequency of asymptotic PHPT and its normocalcemic forms is estimated at 5% and 9% respectively. The above results are the first data on epidemiology of PHPT in this country; however, they are insufficient to comprehensively evaluate the real significance of the problem. Large-scale epidemiological studies are needed to ensure adequate assessment of the situation.

Large-Scale Model Investigation for Monopile Decommissioning of Offshore Wind Turbines: Overpressure and Vibratory Pile

2021 ◽  
Author(s):  
Nils Hinzmann ◽  
Patrick Lehn ◽  
Jörg Gattermann
Keyword(s):  
Large Scale ◽  
Planning Process ◽  
Complete Removal ◽  
Offshore Wind ◽  
Scale Model ◽  
Offshore Wind Turbines ◽  
Large Scale Model ◽  
First Results ◽  
Set Up ◽  
Large Scale Tests

Abstract As of now, only a small number of offshore foundations, related to offshore wind energy, were decommissioned in Europe. With a diameter up to nine meter, an embedment of about 40 meter and a set up effect over 25 years, the necessary force to pull the pile out of the seabed can be assumed, if at all determinable, to be enormous. The piles that were decommissioned were cut beneath the mud line, which leaves approximately one third of the foundation permanently in the seabed. Different methods and techniques for a complete removal of offshore pile foundation are currently investigated within the project DeCoMP. Vibratory extraction aims for a reduction of the pile skin friction by creating a layer of less density between the pile shaft and pending soil. During the design and planning process for vibratory installation or extraction a drivability prediction is a key element. In order to identify and characterize soil parameter for the numerical simulation of a drivability prediction, large-scale tests are performed by the Institute of Geomechanics and Geotechnics of the Technische Universität Braunschweig (IGG-TUBS) [1]. In this paper first results of pilot tests with two vibrators are presented and key elements such as crane uplift, frequency and acceleration displayed.

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