Imperial College London

DrMariosChristou

Faculty of EngineeringDepartment of Civil and Environmental Engineering

Lecturer
 
 
 
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Contact

 

+44 (0)20 7594 6043marios.christou Website

 
 
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Assistant

 

Miss Rebecca Naessens +44 (0)20 7594 5990

 
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Location

 

334Skempton BuildingSouth Kensington Campus

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Summary

 

Publications

Publication Type
Year
to

20 results found

Jaouen F, Waals O, de Jong M, van der Hout A, Christou Met al., Methodology for the design of LNG terminals in a nearshore environment, 35th Conference of Ocean, Offshore and Arctic Engineering

Conference paper

Makri I, Rose S, Christou M, Gibson R, Feld Get al., Examining field measurements of deep-water crest statistics, Conference of Ocean, Offshore and Arctic Engineering

Conference paper

Wu Y, Randell D, Christou M, Ewans K, Jonathan Pet al., 2016, On the distribution of wave height in shallow water, Coastal Engineering, Vol: 111, Pages: 39-49, ISSN: 1872-7379

The statistical distribution of the height of sea waves in deep water has been modelled using the Rayleigh (Longuet-Higgins, 1952) and Weibull distributions (Forristall, 1978). Depth-induced wave breaking leading to restriction on the ratio of wave height to water depth requires new parameterisations of these or other distributional forms for shallow water. Glukhovskiy (1966) proposed a Weibull parameterisation accommodating depth-limited breaking, modified by van Vledder (1991). Battjes and Groenendijk (2000) suggested a two-part Weibull–Weibull distribution. Here we propose a two-part Weibull-generalised Pareto model for wave height in shallow water, parameterised empirically in terms of sea state parameters (significant wave height, HS, local wave-number, kL, and water depth, d), using data from both laboratory and field measurements from 4 offshore locations. We are particularly concerned that the model can be applied usefully in a straightforward manner; given three pre-specified universal parameters, the model further requires values for sea state significant wave height and wave number, and water depth so that it can be applied. The model has continuous probability density, smooth cumulative distribution function, incorporates the Miche upper limit for wave heights (Miche, 1944) and adopts HS as the transition wave height from Weibull body to generalised Pareto tail forms. Accordingly, the model is effectively a new form for the breaking wave height distribution. The estimated model provides good predictive performance on laboratory and field data.

Journal article

Christou M, Ewans K, 2014, Field Measurements of Rogue Water Waves, JOURNAL OF PHYSICAL OCEANOGRAPHY, Vol: 44, Pages: 2317-2335, ISSN: 0022-3670

Journal article

Gibson R, Christou M, Feld G, 2014, The statistics of wave height and crest elevation during the December 2012 storm in the North Sea, OCEAN DYNAMICS, Vol: 64, Pages: 1305-1317, ISSN: 1616-7341

Journal article

Spinneken J, Christou M, Swan C, 2014, Force-controlled absorption in a fully-nonlinear numerical wave tank, Journal of Computational Physics, Vol: 272, Pages: 127-148, ISSN: 0021-9991

An active control methodology for the absorption of water waves in a numerical wave tank is introduced. This methodology is based upon a force-feedback technique which has previously been shown to be very effective in physical wave tanks. Unlike other methods, an a-priori knowledge of the wave conditions in the tank is not required; the absorption controller being designed to automatically respond to a wide range of wave conditions. In comparison to numerical sponge layers, effective wave absorption is achieved on the boundary, thereby minimising the spatial extent of the numerical wave tank. In contrast to the imposition of radiation conditions, the scheme is inherently capable of absorbing irregular waves. Most importantly, simultaneous generation and absorption can be achieved. This is an important advance when considering inclusion of reflective bodies within the numerical wave tank.In designing the absorption controller, an infinite impulse response filter is adopted, thereby eliminating the problem of non-causality in the controller optimisation. Two alternative controllers are considered, both implemented in a fully-nonlinear wave tank based on a multiple-flux boundary element scheme. To simplify the problem under consideration, the present analysis is limited to water waves propagating in a two-dimensional domain.The paper presents an extensive numerical validation which demonstrates the success of the method for a wide range of wave conditions including regular, focused and random waves. The numerical investigation also highlights some of the limitations of the method, particularly in simultaneously generating and absorbing large amplitude or highly-nonlinear waves. The findings of the present numerical study are directly applicable to related fields where optimum absorption is sought; these include physical wavemaking, wave power absorption and a wide range of numerical wave tank schemes.

Journal article

Gibson R, Christou M, Feld G, 2013, EXAMINING FIELD MEASUREMENTS DURING THE DECEMBER 2012 STORM IN THE NORTH SEA, PROCEEDINGS OF THE 13TH INTERNATIONAL WORKSHOP ON WAVE HINDCASTING & FORECASTING & 4TH COASTAL HAZARDS SYMPOSIUM, Banff, Canada

Conference paper

Maris J, Christou M, Huijsmans R, 2012, Investigating the Use of the Hilbert-Huang Transform for the Analysis of Freak Waves, PROCEEDINGS OF THE 31ST CONFERENCE OF OFFSHORE MECHANICS & ARCTIC ENGINEERING

Conference paper

Christou M, Ewans K, 2011, Examining a comprehensive dataset with thousands of freak wave events. Part 1 - Description of the data and the quality control procedure, PROCEEDINGS OF THE 30TH CONFERENCE OF OFFSHORE MECHANICS & ARCTIC ENGINEERING

Conference paper

Christou M, Rijnsdorp DP, Ewans K, 2011, Analysis of shallow water wave measurements recorded at the Field Research Facility, PROCEEDINGS OF THE 12TH INTERNATIONAL WORKSHOP ON WAVE HINDCASTING & FORECASTING & 3RD COASTAL HAZARDS SYMPOSIUM

Conference paper

Buchner B, Forristall G, Ewans K, Christou M, Hennig Jet al., 2011, New insights in extreme crest height distributions - A summary of the CresT JIP, PROCEEDINGS OF THE 30TH CONFERENCE OF OFFSHORE MECHANICS & ARCTIC ENGINEERING

Conference paper

Christou M, Ewans K, 2011, Examining a comprehensive dataset with thousands of freak wave events. Part 2 - Analysis and findings, PROCEEDINGS OF THE 30TH CONFERENCE OF OFFSHORE MECHANICS & ARCTIC ENGINEERING

Conference paper

Christou M, Ewans K, Clauss GF, Klein Met al., 2010, The spatial evolution of the spectral characteristics of the Draupner new year wave, 29TH CONFERENCE OF OFFSHORE MECHANICS & ARCTIC ENGINEERING

Conference paper

Christou M, 2009, Fully Nonlinear Computations of Waves and Wave-structure Interaction

Thesis dissertation

Christou M, Hague CH, Swan C, 2009, The reflection of nonlinear irregular surface water waves, ENGINEERING ANALYSIS WITH BOUNDARY ELEMENTS, Vol: 33, Pages: 644-653, ISSN: 0955-7997

Journal article

Christou M, Tromans P, Vanderschuren L, Ewans Ket al., 2009, Second-order crest statistics of realistic seas states, PROCEEDINGS OF THE 11TH INTERNATIONAL WORKSHOP ON WAVE HINDCASTING & FORECASTING & 2ND COASTAL HAZARDS SYMPOSIUM

Conference paper

Christou M, Swan C, Gudmestad OT, 2008, The interaction of surface water waves with submerged breakwaters, Coastal Engineering, Vol: 55, Pages: 945-958, ISSN: 0378-3839

Journal article

Christou M, Swan C, Gudmestad OT, Roos JSet al., 2008, The interaction of nonlinear waves with the submerged caissons of a gravity-based structure, PROCEEDINGS OF THE 27TH CONFERENCE OF OFFSHORE MECHANICS & ARCTIC ENGINEERING

Conference paper

Christou M, Ewans K, Buchner B, Swan Cet al., 2008, Spectral characteristics of an extreme wave measured in a laboratory basin, PROCEEDINGS OF THE 3RD CONFERENCE ON ROGUE WAVES

Conference paper

Christou M, SWAN C, GUDMESTAD OT, 2007, The description of breaking waves and theunderlying water particle kinematics, PROCEEDINGS OF THE 26TH CONFERENCE OF OFFSHORE MECHANICS & ARCTIC ENGINEERING

Conference paper

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