Engineering Commons^™

Sediment Transport On The River Bandon, Co. Cork, Ireland, Laurence Lomasney

Theses

This thesis analyses sediment transport on the River Bandon, Co. Cork, Ireland. Bedload transport and suspended sediment transport were monitored on the River Bandon over an extended period to determine rates of transport over varying flow conditions. A literature review of sediment properties (individual and bulk sediment), sediment transport, and numerical modelling was undertaken. A manual field sampling programme was undertaken at different locations on the River Bandon to collect bed sediment and suspended sediment for laboratory testing. This data, and data collected using an automatic water sampler and bed sediment traps also, was used to determine baseline conditions for …

Analysis And Modelling Of Sediment Transport On The River Bandon, John Gamble

Theses

Sediment behaviour and transport in river systems has been studied for centuries and potentially impacts on river capacity, navigation, water quality, ecology and flooding. This thesis investigates sediment behaviour and transport on the River Bandon, a river system which has experienced severe flooding on a periodic basis. The River Bandon is located in the South Western River Basin District with a total catchment area of 608km“. The River Bandon offers a positive environment for biodiversity, facilitating habitats for some endangered species. This thesis presents a literature review on the River Bandon and its catchment, on sediment behaviour and transport and …

Suspended Sediment And Nutrient Concentrations And Loads In Two Irish Rivers, Sean T. Harrington

Theses

This thesis presents the results of new and original research on suspended sediment (SS) and nutrient concentrations and loads on the Rivers Bandon and Owenabue in the south of Ireland. It addresses the knowledge gap in SS and nutrient concentration data and in particular SS load/yield estimation methods. A comprehensive database of SS and nutrient concentrations has been established. An investigation into the relationship between water discharge and sediment and nutrient transport is presented and new original relationships between turbidity and suspended sediment concentration (SSC) and nutrients are developed. Turbidity-based suspended sediment loads (SSL) are estimated from the continuous turbidity …

A Technical And Economic Appraisal Of Insulation Retrofits, Niamh O'Brien

Theses

The main aim of this literature review is to further develop the project brief and to examine what research has previously been undertaken in the field of thermal conductivity and retrofitting insulation. The basis of this project is to determine the effect of moisture in domestic cavity walls on the effectiveness of retrofitted insulation. The research began by highlighting the reasoning behind the need for insulation within domestic dwellings within Ireland and the guiding legislation in place in relation to this. Carrying on from this, the current methods used to retrofit insulation were examined, along with the types of insulation …

The Potential For The Elimination Of Expansion Joints And Bridge Bearings From Existing Road Bridges In Ireland, Conor Keena

Theses

This research was focused on determining the feasibility of eliminating expansion joints and bridge bearings from existing short to medium span road bridges in Ireland. It is possible that this could provide a significant long-term economic benefit to bridge owners. A literature review was carried out as part of the research. This included investigations into research conducted in the areas of thermal movements of bridges, concrete creep and shrinkage, soil-structure interaction, lifetime costing, design standards and finite element analysis, and the elimination of bridge expansion joints in other countries.

Finite element analyses were carried out on two existing road bridges. …

Material And Energy Flow Analysis Of The Irish Construction Sector, Rachel Woodward

Theses

A national flow model for concrete was developed using the framework of material and energy flow analysis. Using this framework, the Irish concrete material and energy cycles for the year 2007 were constructed by firstly analysing the material life cycle of concrete which consists of the three phases of production (including extraction of raw materials and manufacture of cement), usage into stock (ready-mix and other concrete products), and waste management. In this year, approximately 35Mt of raw materials were extracted to produce both 5Mt of cement and 33Mt of concrete, with 4.5Mt of cement going into the production of concrete. …

The Optimum Energy Crop In Ireland For Biofuel, Eoin Deasy

Theses

The motivation for this research stems from the potential of biofuels to assist Ireland in meeting obligations outlined in the 'Renewable Energy Source Directive' (2009/28/EC) and to reduce dependency on fossil fuels. The purpose of this work is to establish the merits of biofuel production Ireland ,with a keen focus on the technical, economic and environmental aspects of each. The three biofuel options investigated are biodiesel, bioethanol and biomethane. Eight crop varieties were investigated, these include; wheat, oats, barley, OSR, maize silage, sugar beet, grass silage and potatoes. The approach taken within this thesis was to perform a life cycle …

Scenario Generation And Climate Change Modelling Of Nitrous Oxide Emissions From Grasslands In Ireland, Mark Cochrane

Theses

Described as a two-year study in relation to nitrous oxide emissions from agricultural grassland in the Republic of Ireland under a set or climate and environmental policy scenarios. Nitrous oxide is a greenhouse gas, with a global warning potential approximately three hundred times that or carbon dioxide. lt is required under the Kyoto Protocol that national inventories or all greenhouse gas emissions are established. The Intergovernmental Panel on Climate Change (IPCC) Tier approach is designed to establish current inventories of greenhouse gas emissions; however a scenario approach is also employed in order to estimate emissions in future years. Scenario sets …

Sediment Budgets In The Irish Estuarine Environment, Kevin Motherway

Theses

A sediment budget is the quantification of sediment sources and sinks for natural physical systems such as rivers and estuaries.

This thesis has developed estuarine sediment budgets for Cork Harbour, Kinsale Harbour and Youghal Harbour. The thesis includes a literature review of the properties of sediment, river and estuary related sediment transport, sediment management and sediment related legislation and the approaches used to develop a sediment budget for an estuary system.

An extensive study of riverine suspended sediments discharging to the estuaries has been undertaken. Both surface grab samples and depth integrating suspended sediment samples were collected, tested and analysed. …

Numerical Modelling Of Sediments In Cork Harbour, Jérémy Pingon

Theses

In recent years there have been considerable developments in the new and emerging field of hydroinformatics. This relatively new discipline is concerned with the application of computer and networking technology for the planning, management and protection of water bodies.

Environmental issues in estuaries require accurate and detailed knowledge of cohesive sediment transport processes to assess different issues including water quality, pollutant dispersion, and dredging and maintenance of navigation channels.

This thesis presents a review of the main sediment properties and processes required for modelling the behaviour and transport of sediments. It also introduces a new approach to sediment properties using …