Browsing College of Engineering and Informatics by Author "Nash, Stephen"
Now showing items 21-38 of 38
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Modelling phytoplankton dynamics in a complex estuarine system
Nash, Stephen; Hartnett, Michael; Dabrowski, Tomasz (2011)The primary objective of this research was to develop a generic methodology for numerical modelling of the water quality within estuarine systems; in particular, this research focused on modelling nutrient dynamics and ... -
Nested circulation modelling of inter-tidal zones: details of a nesting approach incorporating moving boundaries
Nash, Stephen; Hartnett, Michael (2010)Nested circulation models developed to date either exclude the flooding and drying process or prohibit flooding and drying of nested boundaries; they are therefore ill-suited to the accurate modelling of inter-tidal areas. ... -
A nested hydrodynamic model incorporating flooding and drying
Nash, Stephen; Hartnett, Michael (2009)A one-way nested version of the hydrobiological model DIVAST (Depth Integrated Velocity and Solute Transport) is introduced. The nested model allows flooding and drying of intertidal areas, a process often present in areas ... -
A nested version of the combined hydrodynamic and water quality model, DIVAST
Nash, Stephen (2007)The present research deals with the development of a one-way nested version of the combined hydrodynamic and water quality model DIVAST (Depth Integrated Velocity and Solute Transport). Initial research has concentrated ... -
Numerical simulation and assessment of the effects of inlet configuration on the flushing time of a potable water service reservoir
O'Neill, Colin J.; Nash, Stephen; Clifford, Eoghan; Mullligan, Sean (Conferences and Events at DigitalCommons@USU, 2018-05-15)Service reservoirs provide the dual function of balancing supply with demand and providing adequate pressure in the water supply network by maintaining sufficient pressure head. In a potable water service reservoir, the ... -
Nutrient dynamics in Cork Harbour
Nash, Stephen; Hartnett, Michael (2005)Estuaries are commonly characterised by high productivity due to frequent if not continuous inputs of nutrients from domestic and industrial discharge effluents and from freshwater and marine sources. These forms of nutrient ... -
Parameterization of turbulence models using 3DVAR data
Olbert, Agnieszka Indiana; Nash, Stephen; Hartnett, Michael (City University of New York, 2014-01-08)In this research the 3DVAR data assimilation scheme is implemented in the numerical model DIVAST in order to optimize the performance of the numerical model by selecting an appropriate turbulence scheme and tuning its ... -
A Performance Assessment Protocol for Structured Mesh Multi-Scale Models
Nash, Stephen; Hartnett, Michael (2011)Nesting techniques are used to develop multi-scale models giving higher resolution and thus greater accuracy in nested domains. The assessment of model accuracy is therefore important for the successful implementation of ... -
Regional modelling of the 21st century climate changes in the Irish Sea
Olbert, Agnieszka Indiana; Dabrowski, Tomasz; Nash, Stephen; Hartnett, Michael (Elsevier, 2012-06)An assessment of the complex evolution of climate change signals in the Irish Sea over the 21st century is presented in this paper. Potential impacts of climate change on the local hydrography are explored and interrelationships ... -
A review study of water quality index models and their use for assessing surface water quality
Uddin, Md Galal; Nash, Stephen; Olbert, Agnieszka Indiana (Elsevier, 2020-12-17)The water quality index (WQI) model is a popular tool for evaluating surface water quality. It uses aggregation techniques that allow conversion of extensive water quality data into a single value or index. Globally, the ... -
Tide-surge interactions and their effects on total sea levels
Olbert, Agnieszka Indiana; Nash, Stephen; Cunnane, Conleth; Hartnett, Michael (Springer Verlag, 2013-05-08)The research presented in this paper involves the application of the joint probability method to the estimation of extreme water levels resulting from astronomical tides and surge residuals and the investigation of the ... -
Tide-surge interactions and their effects on total sea levels in Irish coastal waters
Olbert, Agnieszka Indiana; Nash, Stephen; Cunnane, Conleth; Hartnett, Michael (Springer, 2013-06)The research presented in this paper involves the application of the joint probability method to the estimation of extreme water levels resulting from astronomical tides and surge residuals and the investigation of the ... -
Turbulence modelling using 3DVAR data assimilation in laboratory conditions
Olbert, Agnieszka Indiana; Nash, Stephen; Hartnett, Michael (2013)The viability of turbulence parameter estimation in a numerical model using 3DVAR data assimilation technique is explored in this research. Water currents measured in a physical model are assimilated into the numerical ... -
A two and three-dimensional CFD investigation into performance prediction and wake characterisation of a vertical axis turbine
Mannion, Brian; Leen, Sean B.; Nash, Stephen (AIP Publishing, 2018-05-24)The emergence of tidal energy as a key renewable energy source requires the development of computational design models for accurate prediction of turbine performance and wake effects whilst also being computationally ... -
A two and three-dimensional CFD investigation into performance prediction and wake characterisation of a vertical axis turbine
Mannion, Brian; Leen, Sean B.; Nash, Stephen (AIP Publishing, 2018-05-24)The emergence of tidal energy as a key renewable energy source requires the development of computational design models for accurate prediction of turbine performance and wake effects whilst also being computationally ... -
The use of digital resources in civil engineering education: Enhancing student learning and achieving accreditation criteria.
Nash, Stephen; McCabe, Bryan; Goggins, Jamie; Healy, Mark G. (2012)The use of digital resources in higher education has risen significantly over the last ten years and will continue to do so for the foreseeable future. The challenge for educational instructors is in determining how to ... -
The use of digital resources in civil engineering education: student learning and achieving accreditation criteria
Nash, Stephen; McCabe, Bryan A.; Goggins, Jamie; Healy, Mark G. (Cambridge Scholars Publishing, 2012)The use of digital resources in higher education has risen significantly over the last ten years and will continue to do so for the foreseeable future. The challenge for educational instructors is in determining how to ... -
Vortex drop shaft structures: state-of-the-art and future trends
Mulligan, Sean; Plant, Joss; Nash, Stephen; Clifford, Eoghan (International Association for Hydro-Environment Engineering and Research (IAHR), 2019-09-01)Vortex drop shaft structures have played a critical role in hydraulic engineering; from one of their first applications in hydroelectric energy dissipation in the 1940s, to numerous contemporary installations throughout modern ...