EurOCEAN 2000 - Vlaams Instituut voor de Zee

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TOPIC 2.4. SEDIMENT TRANSPORT/SCOUR BY ACCOUNTING FOR THE EFFECT OF MOMENTARY LIQUEFACTION. This work includes the set up of two pore pressure models. They have been tested against each other, and against some laboratory data on wave induced pore pressures. Laboratory experiments have been conducted to examine the effect of seepage on the near bed hydrodynamics and bedload transport. Mean horizontal velocity profiles have been obtained near the bed. Comparison of direct Reynolds stress measurements with other shear stress estimates obtained close to the bed indicates that the turbulent kinetic energy and the inertial dissipation methods are inaccurate when significant seepage occurs. Preliminary results of some exploratory laboratory experiments indicate that seepage into the flow may result in enhanced bed load sediment transport, although further tests are required to substantiate this. TOPIC 2.5. PENETRATION OF BLOCKS INTO THE BED IN THE ABSENCE OF FILTERS. ISVA has undertaken an extensive series of experiments on the penetration of blocks into the bed in the absence of filters. The bed is exposed to progressive waves. Two kinds of experiments have been made: The undisturbed-flow experiments, and the experiments with the structure model (a pipe, a sphere, and a cube). In the former experiments, the pore-water pressure has been measured across the soil depth. The pore-water pressure builds up, as the waves progress. The soil is liquefied for wave heights larger than a critical value. Regarding the experiments with the structure model, the displacement of the structure (sinking or floatation) has been measured simultaneously with the pore-water pressure. The influence of various parameters (such as the initial position of the object, the specific gravity, the soil layer thickness, and the wave height) has been investigated. It was found that while the pipe sank in the soil to a depth of 2-3 times the pipe diameter, the sphere sank to even larger depths. The pipe with a relatively small specific gravity, initially buried, floats to the surface of the soil. The results have been published in Sumer et al. (1999). In another study in this topic, a random walk model has been developed to predict the buildup of pore pressures in soil with and without the presence of a structure, Sumer and Cheng (1999). TOPIC 2.6. CYCLIC STIFFNESS OF LOOSE SAND. NTNU has carried out an extensive experimental program to measure the geotechnical properties regarding the cyclic stiffness of loose sand from a sand quarry at Hokksund, Norway, and on the soil used by ISVA in their wave flume experiments. The results of the investigation have been published in two internal reports. REFERENCES Arntsen, O. A., Kuhnen, F., Menze, A., Lilleås, T. and Torum, A. (2000): Wave kinematics and wave bottom pressures in the surf zone. Abstract-in-depth. Submitted for presentation at the ICCE’ 2000, Sydney, Australia. Gironella X. and Sánchez-Arcilla A. (1999). Hydrodynamic behaviour of submerged breakwaters. Some remarks based on experimental results. Coastal Structures '99, Santander, Spain, 7-9 June, 1999, ASCE. 478
Ilstad, T., Svano; G., Torum, A., Arntsen, O. (2000). "Wave-induced pore pressure in non-linear soils", Abstract-in- depth submitted for presentation at the ICCE' 2000, Sydney, Australia. Mory, M., Larroudé, Ph., Carreiras, J., Seabra Santos, F.J. (1999). “Scour around pile groups”, Paper for Proceedings of Coastal Structures ’99, Santander, Spain, 7-9 June, 1999, ASCE. Roulund, A., Sumer, B.M., Fredsøe, J. and Michelsen, J. (1998). “3D mathematical modelling of scour around a circular pile in steady current”. Proceedings of the Seventh International Symposium on River Sedimentation, Hong Kong, China, 16-18 December, 1998 (eds. A.W. Jayawardena, J.H.W. Lee and Z.Y. Wang), Publisher: A.A. Balkema, Rotterdam, 1999, pp.131-137. Simons, R R. (1999). Assessment of the Stability of Bed Material Adjacent to Marine Structures. The effects of breaking waves, turbulence, and vortex shedding. HR Wallingford Report TR99. Sumer, B.M. and Fredsøe, J. (1998). “Wave scour around group of vertical piles”. ASCE J. Waterway, Port, Coastal and O cean Engineering, vol. 124, No. 5, 248-256. Sumer, B.M. and Cheng, N.-S. (1999): “A random-walk model for pore pressure accumulation in marine soils”. Proceedings of the 9 th International Offshore and Polar Engineering Conference, ISOPE-99, Brest, France, 30. May-4. June, 1999. Sumer, B.M. and Fredsøe, J. (2000). “Experimental study of two-dimensional scour and its protection at a rubble-mound breakwater”. Coastal Engineering. Vol. 40, Issue 1, pp. 59-87. Sumer, B.M. and Fredsøe, J., Christensen, S. and Lind, M.T .(1999). “Sinking/Floatation of pipelines and other objects in liquefied soil under waves”. Coastal Engineering, vol. 38/2, October 1999, 53-90. Sutherland, J., Whitehouse, R. J. S. and Chapman, B. (1999 a). Scour and deposition around a detached rubble mound breakwater. In: Proceedings of Coastal Structures ’99, Santander, Spain, 7-9 June, ASCE. Sutherland, J S, Chapman, B and Whitehouse, R J S. (1999 b). SCARCOST Experiments in the UK Coastal Research Facility. Data on scour around a detached rubble-mound breakwater. HR Wallingford Report TR98. Whitehouse, R. J. S. (1998). Scour at Marine Structures. Thomas Telford, 216 p. INTERNET ADDRESS OF THE PROJECT http://www.isva.dtu.dk/scarcost/scarcost.html 479
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OFFICE FOR OFFICIAL PUBLICATIONS OF
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EurOCEAN 2000 The European Conferen
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TABLE OF CONTENTS (Volumes I - II)
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Integrated nitrogen model for europ
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II.1.2 Mehtods for monitoring, fore
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III.2.2 Oceanographic measurement a
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380
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382
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Jan van de Graaff Delft University
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dimensional near-field hydrodynamic
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ISVA, turbulence under spilling bre
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Most important results until now: W
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TITLE : PREDICTION OF COHESIVE SEDI
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394 PREDICTION OF COHESIVE SEDIMENT
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processes of CBS. This is particula
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liquefaction (e.g. induced by wave
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TITLE : COASTAL STUDY OF THREE-DIME
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COASTAL STUDY OF THREE-DIMENSIONAL
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morphological change. Their predict
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O’Connor B.A., and Nicholson J. (
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Professor F Seabra-Santos Universid
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The INDIA Project brings together m
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412 (CCMS-POL, USC) and bed sonar e
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Prof. D. Myrhaug (NTNU) Norwegian U
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project is focussed on relevant pra
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Modelling results for the flat bed
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engineering firms (coastal engineer
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422
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Luigi Alberotanza Inst. for the Stu
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All three sites are equipped with i
Page 62 and 63: 2.3 Assessment of methods for the i
Page 64 and 65: TITLE : OPERATIONAL MODELLING FOR C
Page 66 and 67: ‰ B. Model investigations on oper
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Page 70 and 71: TITLE: A USER-FRIENDLY TOOL FOR THE
Page 72 and 73: EUROWAVES OVERVIEW A quick illustra
Page 74 and 75: Figure 1 An example of the EUROWAVE
Page 76 and 77: Figure 4 Example output field for s
Page 78 and 79: 444 EUROPEAN RADAR OCEAN SENSING He
Page 80 and 81: Figure1: WERA current field. Figure
Page 82 and 83: information in maps has proven to b
Page 84 and 85: Universidad Politecnica de Cataluny
Page 86 and 87: esources, such as in ship routing.
Page 88 and 89: Data Analysis The basic idea of adv
Page 90 and 91: implemented in system analyses and
Page 92 and 93: Dr. Claude Millot CNRS LOB/COM B.P.
Page 94 and 95: MEDITERRANEAN FORECASTING SYSTEM PI
Page 96 and 97: ADCP and line three mooring consist
Page 98 and 99: 464 MeteoFrance ftp site Ocean forc
Page 100 and 101: TITLE: ASSESSMENT OF ANTIFOULING AG
Page 102 and 103: INTRODUCTION Antifouling paints are
Page 104 and 105: e.g. diuron was detected in Swedish
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Page 108 and 109: TITLE: SCOUR AROUND COASTAL STRUCTU
Page 110 and 111: Conference among others, and will b
Page 114 and 115: TITEL: VALIDATION OF LOW LEVEL ICE
Page 116 and 117: Ice compressive strength tests were
Page 118 and 119: subsequent inclined shear failure.
Page 120 and 121: 486 Fig. 1 Fig. 2
Page 122 and 123: ir. M. Willems FC/FH - Flanders Hyd
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Page 126 and 127: Both the Zeebrugge and the Petten s
Page 128 and 129: alternative methods for the evaluat
Page 130 and 131: PORTUGAL Dr. César Andrade Centro
Page 132 and 133: Dr. Yolanda Foote Centre for Enviro
Page 134 and 135: cliff erosion and the life span of
Page 136 and 137: BIOLOGICAL PROCESSES ESPED recognis
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Page 144 and 145: 510 AUTOMATIC IDENTIFICATION AND CH
Page 146 and 147: complexity of the data. Once traine
Page 148 and 149: INTEGRATING IDENTIFICATION AND CHAR
Page 150 and 151: TITLE: SEDIMENT IDENTIFICATION FOR
Page 152 and 153: 518 SEDIMENT IDENTIFICATION FOR GEO
Page 154 and 155: The way to sense the marine environ
Page 156 and 157: 6. Data processing and inversion (L
Page 158 and 159: TITLE: TRANSMISSION OF ELECTROMAGNE
Page 160 and 161: 526 Attenuation dB/m 10 4 10 3 10 2
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Figure 2 Spectral response for wave
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TITLE: IMPROVED MICROSTRUCTURE MEAS
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IMPROVED MICROSTRUCTURE MEASUREMENT
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committee proposed the new establis
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of the profiler. Thus, the ACC98 se
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Figure 3b: Measurements of and diss
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TITLE: APPLICATIONS OF 3-DIMENSIONA
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2. OBJECTIVES The first objective o
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to demonstrate a capability for col
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546 ADIAC: DIATOMS GO DIGITAL M. Ba
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SLIDE SCANNING FOR DIATOM LOCALIZAT
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performance of normal PCs and the a
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TITLE : SUBSEA TOOLS APPLICATION RE
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554 SUBSEA TOOLS: A CRAFT PROJECT T
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RESULTS The deliverable is a multi-
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TITLE: DINOFLAGELLATE CATEGORISATIO
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1998) has simplified the developmen
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Fig. 3: Example specimen images 562
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REFERENCES Culverhouse PF, Ellis RE
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566
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INTRODUCTION 568 LOTUS Long Range T
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DESIGN OF EXPERIMENTAL EQUIPMENT Th
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Figure 2: Complex base-band impulse
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ACKNOWLEDGEMENTS This work is funde
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576 THE SEISCAN INITIATIVE: SEISMIC
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een fed through to the scanning cen
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Data scanned At the time of writing
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The digital transcription forms an
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584 SUMMARY OF SWAN PROJECT OBJECTI
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Apart from suffering from ISI, a mu
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TITLE : LONG-RANGE SHALLOW-WATER RO
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OBJECTIVES Present communication sy
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RESULTS OF THE DATA ANALYSIS Analys
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TITLE : UNDERWATER DIVING INTERPERS
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Orientation The electrical field ap
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[6] Virr LE (1987) « Role of elect
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TITLE : ELECTROACOUSTIC PROTOTYPE F
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specimen of bottlenose dolphin capt
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REFERENCES Cameron, G. 1999. Report
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606
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608 HIGH RESOLUTION IN SITU HOLOGRA
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due to thermal expansion. The power
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612 200 mm stages with optics and C
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III.1.4 Submarine geotechnics 615
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TITLE : GROUTED OFFSHORE PILES FOR
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Solution One solution to this probl
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technology. Harbour works, wharves,
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• A major characterisation progra
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VERY HIGH RESOLUTION MARINE 3D SEIS
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Monaco harbour (France) A very comp
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End-users highlighted the current,
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C. Smith Institute of Marine Biolog
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package for Automatic Mobile Invest
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The operation of ARAMIS The typical
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• ROV landing on the sea bottom t
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EURODOCKER - A UNIVERSAL DOCKING -
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RESULTS: EURODOCKER SYSTEM DESCRIPT
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THE PROTOTYPE The Construction of t
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TITLE : LIGHTWEIGHT COMPOSITE PRESS
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OBJECTIVES: The aim of the project
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TITLE : ADVANCED SYSTEM INTEGRATION
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651 Differential GPS - Reference St
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Figure 3.a The DELFIM ASC Figure 3.
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place vertically in the framework o
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[8] A. Pascoal, . P. Oliveira, C. S
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Eng. J.-M.Coudeville ORCA Instrumen
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THE GEOSTAR PROTOTYPE GEOSTAR proto
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CONCLUSIONS GEOSTAR 2 is a project
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goals of the project and results of
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III.2.2. Oceanographic measurement
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TITLE : GAS HYDRATE AUTOCLAVE CORIN
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initially most important parameters
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3.4 Finalization of delayed tasks i
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Dr. Margaret Yelland Southampton Oc
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RESULTS FROM THE FIRST PROJECT PERI
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Taylor,P. K. and M. J. Yelland, 199
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TRACE METAL MONOTORING IN SURFACE M
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THE FLUORESCENCE SIGNAL OBTAINED WH
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The reaction of 6-mercaptopurine, l
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TITLE : OCEAN TOMOGRAPHY OPERATIONA
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The OCTOPUS project has been runnin
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Fig. 2: Typical TOMOLAB input: Tomo
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The establishment of a data bank fo
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TITLE: SPECTROSCOPY USING OPTICAL F
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The overall objective of the SOFIE
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devoted to investigate the behaviou
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TITLE : DEVELOPMENT AND TEST OF AN
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in-situ (Nitrate, Nitrite, Ammonia,
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Apart from the measurements made in
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MANUFACTURE OF CALIBRATION SOLUTION
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einz-Detlef Kronfeldt, Heinar Schmi
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