Theophanis V. Karambas - Academia.edu (original) (raw)

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Papers by Theophanis V. Karambas

Research paper thumbnail of Modelling beach profile response during a storm in Praia de Faro, Portugal: Comparison of three beach profile models

The aim of the present contribution is to compare three numerical models on the grounds of their ... more The aim of the present contribution is to compare three numerical models on the grounds of their performance in simulating beach profile response on a monitored storm event in the Praia de Faro, South Portugal. The discussed storm occurred on February 1st, 2009, with duration ~24 hours and WSW waves, with maximum observed significant wave height and peak period, around

Research paper thumbnail of BREAKING WAVE EVOLUTION OVER MONOLITHIC SUBMERGED BREAKWATERS: AN EXPERIMENTAL AND NUMERICAL STUDY

Coastal Engineering 2002 - Solving Coastal Conundrums - Proceedings of the 28th International Conference, 2003

Research paper thumbnail of Modelling of waves and currents around submerged breakwaters

... For modelling wave dissipation over submerged breakwaters, it was found necessary to modify t... more ... For modelling wave dissipation over submerged breakwaters, it was found necessary to modify the wave breaking theory in order ... (1984) while the bottom friction dissipation ... The phase-resolving method is based on a 2DH-Boussinesq-type model for wave evolution over porous ...

Research paper thumbnail of Boussinesq Model for Weakly Nonlinear Fully Dispersive Water Waves

Journal of Waterway, Port, Coastal, and Ocean Engineering, 2009

In the present work a new post-Boussinesq type dispersive wave propagation model is proposed. It ... more In the present work a new post-Boussinesq type dispersive wave propagation model is proposed. It is developed for fully dispersive and weakly nonlinear irregular waves. The momentum equations include only one frequency dispersion term, expressed through convolution integrals, which are estimated using appropriate impulse functions. The model is applied to simulate the propagation of regular and irregular waves using a simple explicit scheme of finite differences. The results of the simulations are compared with experimental data. The comparisons show that the method is capable of simulating weakly nonlinear dispersive wave propagation over finite water depth, as well as breaking wave-induced currents, in a satisfactory way.

Research paper thumbnail of Morphology and sedimentology of a microtidal beach with beachrocks: Vatera, Lesbos, NE Mediterranean

Continental Shelf Research, 2009

The present contribution considers the dynamics of beaches occupied by outcropping/buried beachro... more The present contribution considers the dynamics of beaches occupied by outcropping/buried beachrocks, i.e. hard coastal formations consisting of beach material lithified by in situ precipitated carbonate cements. The dynamics of a Greek microtidal beach with beachrocks (Vatera, Lesbos) are examined through the collection and analysis of morphological and sedimentary field data, a 2-D nearshore hydrodynamic model and a specially constructed 1-D morphodynamic model. The results showed that the beachrock-occupied part of the beach is characterised by distinctive morphodynamics as: (i) its beachface is associated with large slopes; (ii) there is a good spatial correlation between the sub-aerial and shallow submerged mean beach profile and the buried/outcropping upper beachrock surface; and (iii) the seaward margins of the submerged beachrock outcrops are always associated with a 'scour step' i.e. a submerged cliff. The results also showed that beachrock outcrops can bias crossshore sediment exchanges by impeding onshore transport due to the presence of the scour step. In this sense, beachrock outcrops may be considered as offshore transport 'conduits' for the beach sediments. A conceptual model of beach sediment transport, based on the field data and the hydrodynamic modelling is proposed. According to this model, fresh beach material from adjacent terrestrial sources is transported alongshore, towards the central part of the embayment, where a littoral transport convergence zone occurs under most wave conditions. There, the laterally supplied sediments are lost offshore.

Research paper thumbnail of Modelling of waves and currents around submerged breakwaters

Coastal Engineering, 2005

... For modelling wave dissipation over submerged breakwaters, it was found necessary to modify t... more ... For modelling wave dissipation over submerged breakwaters, it was found necessary to modify the wave breaking theory in order ... (1984) while the bottom friction dissipation ... The phase-resolving method is based on a 2DH-Boussinesq-type model for wave evolution over porous ...

Research paper thumbnail of Simulation of tsunami generation, propagation and coastal inundation in the Eastern Mediterranean

Ocean Science, Aug 27, 2015

In the present work, an advanced tsunami generation, propagation and coastal inundation 2-DH mode... more In the present work, an advanced tsunami generation, propagation and coastal inundation 2-DH model (i.e. 2-D Horizontal model) based on the higher-order Boussinesq equations – developed by the authors – is applied to simulate representative earthquake-induced tsunami scenarios in the Eastern Mediterranean. Two areas of interest were selected after evaluating tsunamigenic zones and possible sources in the region: one at the southwest of the island of Crete in Greece and one at the east of the island of Sicily in Italy. Model results are presented in the form of extreme water elevation maps, sequences of snapshots of water elevation during the propagation of the tsunamis, and inundation maps of the studied low-lying coastal areas. This work marks one of the first successful applications of a fully nonlinear model for the 2-DH simulation of tsunami-induced coastal inundation; acquired results are indicative of the model's capabilities, as well of how areas in the Eastern Mediterranean would be affected by eventual larger events.

Research paper thumbnail of Modelling beach profile response during a storm in Praia de Faro, Portugal: Comparison of three beach profile models

The aim of the present contribution is to compare three numerical models on the grounds of their ... more The aim of the present contribution is to compare three numerical models on the grounds of their performance in simulating beach profile response on a monitored storm event in the Praia de Faro, South Portugal. The discussed storm occurred on February 1st, 2009, with duration ~24 hours and WSW waves, with maximum observed significant wave height and peak period, around

Research paper thumbnail of BREAKING WAVE EVOLUTION OVER MONOLITHIC SUBMERGED BREAKWATERS: AN EXPERIMENTAL AND NUMERICAL STUDY

Coastal Engineering 2002 - Solving Coastal Conundrums - Proceedings of the 28th International Conference, 2003

Research paper thumbnail of Modelling of waves and currents around submerged breakwaters

... For modelling wave dissipation over submerged breakwaters, it was found necessary to modify t... more ... For modelling wave dissipation over submerged breakwaters, it was found necessary to modify the wave breaking theory in order ... (1984) while the bottom friction dissipation ... The phase-resolving method is based on a 2DH-Boussinesq-type model for wave evolution over porous ...

Research paper thumbnail of Boussinesq Model for Weakly Nonlinear Fully Dispersive Water Waves

Journal of Waterway, Port, Coastal, and Ocean Engineering, 2009

In the present work a new post-Boussinesq type dispersive wave propagation model is proposed. It ... more In the present work a new post-Boussinesq type dispersive wave propagation model is proposed. It is developed for fully dispersive and weakly nonlinear irregular waves. The momentum equations include only one frequency dispersion term, expressed through convolution integrals, which are estimated using appropriate impulse functions. The model is applied to simulate the propagation of regular and irregular waves using a simple explicit scheme of finite differences. The results of the simulations are compared with experimental data. The comparisons show that the method is capable of simulating weakly nonlinear dispersive wave propagation over finite water depth, as well as breaking wave-induced currents, in a satisfactory way.

Research paper thumbnail of Morphology and sedimentology of a microtidal beach with beachrocks: Vatera, Lesbos, NE Mediterranean

Continental Shelf Research, 2009

The present contribution considers the dynamics of beaches occupied by outcropping/buried beachro... more The present contribution considers the dynamics of beaches occupied by outcropping/buried beachrocks, i.e. hard coastal formations consisting of beach material lithified by in situ precipitated carbonate cements. The dynamics of a Greek microtidal beach with beachrocks (Vatera, Lesbos) are examined through the collection and analysis of morphological and sedimentary field data, a 2-D nearshore hydrodynamic model and a specially constructed 1-D morphodynamic model. The results showed that the beachrock-occupied part of the beach is characterised by distinctive morphodynamics as: (i) its beachface is associated with large slopes; (ii) there is a good spatial correlation between the sub-aerial and shallow submerged mean beach profile and the buried/outcropping upper beachrock surface; and (iii) the seaward margins of the submerged beachrock outcrops are always associated with a 'scour step' i.e. a submerged cliff. The results also showed that beachrock outcrops can bias crossshore sediment exchanges by impeding onshore transport due to the presence of the scour step. In this sense, beachrock outcrops may be considered as offshore transport 'conduits' for the beach sediments. A conceptual model of beach sediment transport, based on the field data and the hydrodynamic modelling is proposed. According to this model, fresh beach material from adjacent terrestrial sources is transported alongshore, towards the central part of the embayment, where a littoral transport convergence zone occurs under most wave conditions. There, the laterally supplied sediments are lost offshore.

Research paper thumbnail of Modelling of waves and currents around submerged breakwaters

Coastal Engineering, 2005

... For modelling wave dissipation over submerged breakwaters, it was found necessary to modify t... more ... For modelling wave dissipation over submerged breakwaters, it was found necessary to modify the wave breaking theory in order ... (1984) while the bottom friction dissipation ... The phase-resolving method is based on a 2DH-Boussinesq-type model for wave evolution over porous ...

Research paper thumbnail of Simulation of tsunami generation, propagation and coastal inundation in the Eastern Mediterranean

Ocean Science, Aug 27, 2015

In the present work, an advanced tsunami generation, propagation and coastal inundation 2-DH mode... more In the present work, an advanced tsunami generation, propagation and coastal inundation 2-DH model (i.e. 2-D Horizontal model) based on the higher-order Boussinesq equations – developed by the authors – is applied to simulate representative earthquake-induced tsunami scenarios in the Eastern Mediterranean. Two areas of interest were selected after evaluating tsunamigenic zones and possible sources in the region: one at the southwest of the island of Crete in Greece and one at the east of the island of Sicily in Italy. Model results are presented in the form of extreme water elevation maps, sequences of snapshots of water elevation during the propagation of the tsunamis, and inundation maps of the studied low-lying coastal areas. This work marks one of the first successful applications of a fully nonlinear model for the 2-DH simulation of tsunami-induced coastal inundation; acquired results are indicative of the model's capabilities, as well of how areas in the Eastern Mediterranean would be affected by eventual larger events.