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9 results on '"Avdis, Alexandros"'

3. Prediction of shoreline–shelf depositional process regime guided by palaeotidal modelling

Author

Collins, Daniel S, Avdis, Alexandros, Wells, Martin R, Dean, Christopher, Mitchell, Andrew J, Allison, Peter A, Johnson, Howard D, Hampson, Gary J, Hill, Jon, Piggott, Matthew D, Collins, Daniel S, Avdis, Alexandros, Wells, Martin R, Dean, Christopher, Mitchell, Andrew J, Allison, Peter A, Johnson, Howard D, Hampson, Gary J, Hill, Jon, and Piggott, Matthew D

Abstract

Ancient shoreline–shelf depositional systems are influenced by an unusually wide array of geological, biological and hydrodynamic processes, with sediment transport and deposition primarily determined by the interaction of river, wave (including storm) and tidal processes, and changes in relative sea level. Understanding the impact of these processes on shoreline–shelf morphodynamics and stratigraphic preservation remains challenging. Numerical modelling integrated with traditional facies analysis provides an increasingly viable approach, with the potential to quantify, and thereby improve understanding of, the impact of these complex coastal sedimentary processes. An integrated approach is presented here that focuses on palaeotidal modelling to investigate the controls on ancient tides and their influence on sedimentary deposition and preservation – one of the three cornerstones of the ternary process classification scheme of shoreline-shelf systems. Numerical tidal modelling methodology is reviewed and illustrated in three palaeotidal model case studies of different scales and focus. The results are synthesised in the context of shoreline–shelf processes, including a critique and modification of the process-based classification scheme. The emphasis on tidal processes reflects their global importance throughout Earth’s history. Ancient palaeotidal models are able to highlight and quantify the following four controls on tidal processes: (1) the physiography (shape and depth) of oceans (1000s km scale) determines the degree of tidal resonance; (2) the physiography of ocean connections to partly enclosed water bodies (100–1000s km scale) determines the regional-scale flux of tidal energy (inflow versus outflow); (3) the physiography of continental shelves influences shelf tidal resonance potential; and (4) tides in relatively local-scale embayments (typically 1–10s km scale) are influenced by the balance of tidal amplification due to funnelling, shoaling and resonance, Copyright © 2021, Collins, D et al. This document is the author’s accepted version of the journal article. You are advised to consult the published version if you wish to cite from it., NHM Repository

Published
2021

4. Optimising tidal range power plant operation

Author

Angeloudis, Athanasios, Kramer, Stephan, Avdis, Alexandros, Piggott, Matthew, Natural Environment Research Council (NERC), and Engineering & Physical Science Research Council (EPSRC)

Subjects
Technology, REPRESENTATION, 010504 meteorology & atmospheric sciences, bepress|Engineering, EarthArXiv|Engineering, Computational Engineering, 02 engineering and technology, Oceanography, 01 natural sciences, Resource assessment, 09 Engineering, Engineering, Marine energy, Physical Sciences and Mathematics, 0202 electrical engineering, electronic engineering, information engineering, UK, Hydraulic Engineering, Energy, EarthArXiv|Engineering|Civil and Environmental Engineering, bepress|Engineering|Electrical and Computer Engineering|Power and Energy, Oceanography and Atmospheric Sciences and Meteorology, Electrical and Computer Engineering, bepress|Engineering|Civil and Environmental Engineering|Civil Engineering, General Energy, Electricity generation, SEVERN BARRAGE, Available energy, LAGOON, Tidal power, Marine engineering, Communication channel, bepress|Physical Sciences and Mathematics, Civil and Environmental Engineering, Engineering, Chemical, EarthArXiv|Physical Sciences and Mathematics|Oceanography and Atmospheric Sciences and Meteorology, EarthArXiv|Engineering|Civil and Environmental Engineering|Civil Engineering, Tidal range, Energy & Fuels, Power station, 020209 energy, SCHEMES, EarthArXiv|Engineering|Civil and Environmental Engineering|Hydraulic Engineering, Power and Energy, HYDRODYNAMIC IMPACTS, Management, Monitoring, Policy and Law, Civil Engineering, bepress|Engineering|Civil and Environmental Engineering|Hydraulic Engineering, EarthArXiv|Physical Sciences and Mathematics|Oceanography and Atmospheric Sciences and Meteorology|Oceanography, EarthArXiv|Engineering|Electrical and Computer Engineering|Power and Energy, Energy(all), bepress|Engineering|Computational Engineering, bepress|Engineering|Electrical and Computer Engineering, bepress|Physical Sciences and Mathematics|Oceanography and Atmospheric Sciences and Meteorology, ESTUARY, EarthArXiv|Engineering|Computational Engineering, OPTIMIZATION, 14 Economics, bepress|Physical Sciences and Mathematics|Oceanography and Atmospheric Sciences and Meteorology|Oceanography, 0105 earth and related environmental sciences, Science & Technology, business.industry, Mechanical Engineering, Tidal lagoon, Gradient-based optimisation, FOS: Earth and related environmental sciences, Building and Construction, Optimal control, Control optimisation, EarthArXiv|Physical Sciences and Mathematics, MODEL, bepress|Engineering|Civil and Environmental Engineering, EarthArXiv|Engineering|Electrical and Computer Engineering, business, Tidal range energy, FOS: Civil engineering, GENERATION
Abstract

Tidal range power plants represent an attractive approach for the large-scale generation of electricity from the marine environment. Even though the tides and by extension the available energy resource are predictable, they are also variable in time. This variability poses a challenge regarding the optimal transient control of power plants. Here we consider simulation methods which include the main modes of operation of tidal power plants, along with algorithms to regulate the timing of these.This paper proposes a framework where simplified power plant operation models are coupled with gradient-based optimisation techniques to determine the optimal control strategy over multiple tidal cycles. The optimisation results in turn inform coastal ocean simulations that include tidal power plants to gauge whether the benefits of an adaptive operation are preserved once their hydrodynamic impacts are also taken into consideration. The combined operation of two prospective tidal lagoon projects within the Bristol Channel and the Severn Estuary is used as an example to demonstrate the potential benefits of an energy maximisation optimisation approach.For the case studies considered, the inclusion of pumping and an adaptive operation is shown to deliver an overall increase in energy output of 20-40 % compared to a conventional two-way uniform operation. The findings also demonstrate that smaller schemes stand to gain more from operational optimisation compared to designs of a larger scale.

Published
2018

6. Tidal range energy resource and optimization – Past perspectives and future challenges

Author

Neill, Simon P., primary, Angeloudis, Athanasios, additional, Robins, Peter E., additional, Walkington, Ian, additional, Ward, Sophie L., additional, Masters, Ian, additional, Lewis, Matt J., additional, Piano, Marco, additional, Avdis, Alexandros, additional, Piggott, Matthew D., additional, Aggidis, George, additional, Evans, Paul, additional, Adcock, Thomas A.A., additional, Židonis, Audrius, additional, Ahmadian, Reza, additional, and Falconer, Roger, additional

Published
2018
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