Quantification of energy losses at a surcharging manhole

Hydraulic models of sewer systems are commonly used to predict the risk of urban flooding. However, suitable calibration datasets in flood conditions are scarce. The quantification of energy losses within manhole structures is a current source of uncertainty within such models. To address this gap, a scaled physical manhole model is used to quantify hydraulic energy losses during surcharging and non-surcharging conditions. Two different novel configurations were tested; (1) With and without the presence of a manhole lid; (2) With and without the presence of a shallow flow on the surface. Results showed that total head losses were found to increase in surcharging conditions. The presence of the lid also marginally increased total head losses. The datasets are used to assess the performance of a numerical urban flood model (SIPSON) and comparisons highlighted that SIPSON tends to overestimate energy losses in surcharging conditions

Social inequalities in rural England: Impacts on young people post-2008

This is the author accepted manuscript. The final version is available from Elsevier via the DOI in this recordThis paper investigates the cumulative impacts of the 2008 economic crisis and its aftermath (including policy changes) on young people in a sparsely populated rural area of northern England. The paper locates the research in the context of youth studies, Bourdieu's theory of practice, concepts of welfare regimes and welfare mix, and studies of the impacts of the crisis and austerity policies on the distribution of social and societal risk. The empirical findings reveal the challenges which faced young people in rural England before the financial crisis still persist. Moreover, the overwhelming reliance of young people on family for support generates further inequalities through what might be termed ‘secondary impact austerity’: young people feel indirectly and unevenly the economic effects and policy changes which impact on parents' and communities' ability to offer them support. Thus, changes to the welfare system, loss of services and less secure forms of employment exacerbate the transfer of social risk and the deepening of poverty for vulnerable groups. This is worsened in this rural area by the moral imperatives which stigmatise access to state and charitable support. Thus, moral capital and local habitus intersect with social, economic and cultural capitals in structuring inequalities.Newcastle Universit

CFD modelling of the transport of soluble pollutants from sewer networks to surface flows during urban flood events

Surcharging urban drainage systems are a potential source of pathogenic contamination of floodwater. While a number of previous studies have investigated net sewer to surface hydraulic flow rates through manholes and gullies during flood events, an understanding of how pollutants move from sewer networks to surface flood water is currently lacking. This paper presents a 3D CFD model to quantify flow and solute mass exchange through hydraulic structures featuring complex interacting pipe and surface flows commonly associated with urban flood events. The model is compared against experimental datasets from a large-scale physical model designed to study pipe/surface interactions during flood simulations. Results show that the CFD model accurately describes pipe to surface flow partition and solute transport processes through the manhole in the experimental setup. After validation, the model is used to elucidate key timescales which describe mass flow rates entering surface flows from pipe networks. Numerical experiments show that following arrival of a well-mixed solute at the exchange structure, solute mass exchange to the surface grows asymptotically to a value equivalent to the ratio of flow partition, with associated timescales a function of the flow conditions and diffusive transport inside the manhole

Protocol for a realist review of complex interventions to prevent adolescents from engaging in multiple risk behaviours

Objectives - Adolescent risk behaviours are a key health concern. The purpose of this research is to gain a deeper understanding of how, why, for whom, and in what circumstances complex adolescent risk behaviour prevention programmes are most successful. Methods and analysis - To understand how adolescent risk behaviour prevention programmes work in a real life context, a realist synthesis will be undertaken, operationalised in four phases. Phase one - Developing a framework to map the theoretical and conceptual landscape of adolescent risk behaviour prevention. Guided by stakeholder consultation. Phase two - Formulating initial programme theories through exploration of the literature, along with primary data from professional stakeholder interviews. Phase three - Refining programme theories through more purposeful, in depth screening of the literature, along with primary qualitative data, from young people and professionals. Data will be collected through semi structured focus groups, to explore specific elements of the emerging programme theories. Phase four - Testing programme theories through interviews with youth workers, following consultation with young people, using vignettes to explore the relationship between specific programme theories. This relatively novel method of primary and secondary data integration within a realist synthesis will provide deeper insight in to young peoples lived experience of risk behaviour prevention programmes, while maintaining transparency in the process of programme theory development. Methods and analysis Data analysis - A realist logic of analysis will be used to align data from each phase with context mechanism outcome configurations or specific elements thereof. Substantive theory will then be sought to understand and explain the findings. Ethics and dissemination - This study has been approved by the Ethics committee at Northumbria University, UK. Findings will be disseminated through knowledge exchange with stakeholders, publications in peer-reviewed journals, conference presentations, and formal and informal reports

Spatial justice and locality: the conceptual framework and application

Place-based strategies are widely discussed as powerful instruments of economic and community development. In terms of the European debate, the local level - cities, towns and neighbourhoods - has recently come under increased scrutiny as a potentially decisive actor in Cohesion Policy. As understandings of socio-spatial and economic cohesion evolve, the idea that spatial justice requires a concerted policy response has gained currency. Given the political, social and economic salience of locale, this book explores the potential contribution of place-based initiatives to more balanced and equitable socio-economic development, as well as to growth in a more general sense. The overall architecture of the book and the individual chapters address place-based perspective from a number of vantage points, including the potential of achieving greater effectiveness in EU and national level development policies, through a greater local level and citizens\u27 role and concrete actions for achieving this, enhancing decision-making autonomy by pooling local capacities for action; linking relative development autonomy to local outcomes and viewing spatial justice as a concept and policy goal. The book highlights, through the use of case-studies, how practicable and actionable knowledge can be gained from local development experiences. This book targets researchers, practitioners and students who seek to learn more about place-based development and its potentials. Its cross-cutting focus on spatial justice and place will ensure that the book is of wider international interest

Experimental calibration and validation of sewer/surface flow exchange equations in steady and unsteady flow conditions

This is the final version of the article. Available from Elsevier via the DOI in this record.The linkage between sewer pipe flow and floodplain flow is recognised to induce an important source of uncertainty within two-dimensional (2D) urban flood models. This uncertainty is often attributed to the use of empirical hydraulic formulae (the one-dimensional (1D) weir and orifice steady flow equations) to achieve data-connectivity at the linking interface, which require the determination of discharge coefficients. Because of the paucity of high resolution localised data for this type of flows, the current understanding and quantification of a suitable range for those discharge coefficients is somewhat lacking. To fulfil this gap, this work presents the results acquired from an instrumented physical model designed to study the interaction between a pipe network flow and a floodplain flow. The full range of sewer-to-surface and surface-to-sewer flow conditions at the exchange zone are experimentally analysed in both steady and unsteady flow regimes. Steady state measured discharges are first analysed considering the relationship between the energy heads from the sewer flow and the floodplain flow; these results show that existing weir and orifice formulae are valid for describing the flow exchange for the present physical model, and yield new calibrated discharge coefficients for each of the flow conditions. The measured exchange discharges are also integrated (as a source term) within a 2D numerical flood model (a finite volume solver to the 2D Shallow Water Equations (SWE)), which is shown to reproduce the observed coefficients. This calibrated numerical model is then used to simulate a series of unsteady flow tests reproduced within the experimental facility. Results show that the numerical model overestimated the values of mean surcharge flow rate. This suggests the occurrence of additional head losses in unsteady conditions which are not currently accounted for within flood models calibrated in steady flow conditions.The research has been supported by the UK Engineering and Physical Sciences Research Council (grants ID: EP/K040405/1)