23 research outputs found
Final phase-resolving Boussinesq-type models (D42)
No full textThe design of structures to be built in the nearshore region generally involves the evaluation of different possible layouts, under the effects of local wave and cunents conditions, with the aim of minimizing costs and maximizing the desired results. In particular the design of lowcrested structures involves optimisation of several parameters, which influence both the position, and the shape of the structures. The possible layout of the structures to be designed can be tested experimentally in wave tanks and wave flumes using adequate scale models. An alternative and attractive procedure is to employ suitable numerical and mathematical models. In principle, a very advanced numerical model, able to conectly simulate all the nearshore phenomena (turbulence, waves, currents, sediment transport, etc.) could be equivalent or even superior to a physical model. In practice, the numerical models currently employed in engineering activities, use several assumptions and simplifications: the phenomena that can be simulated strictly depend on the governing equations solved by the model. Indeed, the great advantage of numerical and mathematica! models is that their application is usually much less expensive than physical ones: it is certainly more economie to modify a computer file describing the bathymetry of the area under investigation than rebuild a physical model layout. This report is structured into two discrete sections, the first one contributed by AUTh and the second one by UR3. In the first section a 2DH higher-order Boussinesq-type model combined with a porous flow model, developed tor simulating flow around porous submerged structures is presented. On the other hand, in the second section enhancements on the applicability of Boussinesq-type equations (BTE) into the surf and swash zone are described.Delo
Numerical modelling of a floating hybrid offshore wind and wave energy system by uilizing the generalized modes approach
No full textThe use of relict sand lying on the continental shelf for unprotected beach nourishment
No full textserie "Coastal Systems and Continental Margins"
EDS. Soft Shore Protection. An Environmental Innovation in Coastal Engineering. vol. 7, p. 39-4
FUNCTIONAL DESIGN OF SUBMERGED BREAKWATERS FOR COASTAL PROTECTION USING TWO WAVE/MORPHOLOGICAL MODELS
No full text
Professor William Macewen (1848-1924): The Scottish Pioneer of Surgery
No full textProfessor William Macewen (1848-1924) is one of the most important figures in world’s surgery during 18th and early 19th century. He managed to provide numerous innovative techniques and instruments in various fields of surgery such as general surgery, orthopedic surgery, neurosurgery, and thoracic surgery. His innovations had a great impact after his time and constituted the fundaments for further surgical developments. He also was a pioneer in clinical photography with the creation of a huge archive. During his surgical career, he received many honors. © The Author(s) 2020
Assessment of island beach erosion due to sea level rise: The case of the Aegean archipelago (Eastern Mediterranean)
No full textThe present contribution constitutes the first comprehensive attempt to (a) record the spatial characteristics of the beaches of the Aegean archipelago (Greece), a critical resource for both the local and national economy, and (b) provide a rapid assessment of the impacts of the long-term and episodic sea level rise (SLR) under different scenarios. Spatial information and other attributes (e.g., presence of coastal protection works and backshore development) of the beaches of the 58 largest islands of the archipelago were obtained on the basis of remote-sensed images available on the web. Ranges of SLR-induced beach retreats under different morphological, sedimentological and hydrodynamic forcing, and SLR scenarios were estimated using suitable ensembles of cross-shore (1-D) morphodynamic models. These ranges, combined with empirically derived estimations of wave run-up induced flooding, were then compared with the recorded maximum beach widths to provide ranges of retreat/erosion and flooding at the archipelago scale. The spatial information shows that the Aegean <q>pocket</q> beaches may be particularly vulnerable to mean sea level rise (MSLR) and episodic SLRs due to (i) their narrow widths (about 59ĝ€% of the beaches have maximum widths &lt;ĝ€20ĝ€m), (ii) their limited terrestrial sediment supply, (iii) the substantial coastal development and (iv) the limited existing coastal protection. Modeling results indeed project severe impacts under mean and episodic SLRs, which by 2100 could be devastating. For example, under MSLR of 0.5ĝ€m - representative concentration pathway (RCP) 4.5 of the Fifth Assessment Report (AR5) of the Intergovernmental Panel on Climate change (IPCC) - a storm-induced sea level rise of 0.6ĝ€m is projected to result in a complete erosion of between 31 and 88ĝ€% of all beaches (29-87ĝ€% of beaches are currently fronting coastal infrastructure and assets), at least temporarily. Our results suggest a very considerable risk which will require significant effort, financial resources and policies/regulation in order to protect/maintain the critical economic resource of the Aegean archipelago. © Author(s) 2017
