Dr Alex Hagen-Zanker

Senior Lecturer
+44 (0)1483 682440
04 AA 03

Academic and research departments

Department of Civil and Environmental Engineering.


University roles and responsibilities

  • Director of Learning and Teaching
  • Module Leader
  • Personal Tutor
  • Module Contributor
  • Visiting Tutor
  • Principal Investigator
  • Co-Investigator
  • PhD Supervisor

My qualifications

MSc in Civil Engineering
University of Twente
PhD in Geographical Information Science
Maastricht University


Research interests

My teaching

Courses I teach on


Postgraduate taught

My publications


Michael G. Hutchins, David Fletcher, ALEX HIDDE HAGEN-ZANKER, Haifeng Jia, Laurence Jones, Hong Lin, Steven Loiselle, James Miller, Stefan Reis, Isabel Seifert Dähnn, Vanessa Wilde, Chong-Yu Xu, Dawen Yang, JINGYAN YU, Shen Yu (2021)Why scale is vital to plan optimal Nature-Based Solutions for resilient cities , In: Environmental Research Letters16(4)044008 IOP Publishing Ltd
A need for multi-functional assessment tools evaluating trade-offs and co-benefits for various types of Nature-Based Solution (NBS) has been increasingly identified in recent years. Methodologically, concepts for a tool are presented which include quantifying the demand and potential for NBS to enhance ecosystem service (ES) provision, and linking ecosystem services to readily quantifiable and legislatively-relevant environmental quality indicators (EQIs). The objective of tool application is to identify optimal NBS placement across a diverse set of socio-environmental indicators, whilst also incorporating issues of relative location of areas of implementation and benefit accrual. Embedded within the tool is the importance of evaluating outcomes in terms of economic benefits and of sustainable development goals. The concepts are illustrated with simplified examples, relating to the case of implementing urban forestry as an exemplar NBS. By summarising the knowledge base it is demonstrated that benefits of NBS are substantially scale-dependent in two main respects; those of extent and proximity to receptors. Evaluation tools should be capable of quantifying scale-dependence. The substantive importance of these considerations and how their dynamics vary between indicators and services is illustrated graphically through schematic functions. When developed, the tool should be used as a focus for consultation and co-design to pinpoint the size of NBS necessary to achieve a sufficient level of benefit for a particular receptor. This could be measured against target levels of benefit for each indicator, distinguishing between primary intended outcomes and those co-benefits or trade-offs that are secondary or unintended.
Nick Grudgings, Susan Hughes, Alex Hagen-Zanker (2021)The comparison and interaction of age and gender effects on cycling mode-share: An analysis of commuting in England and Wales, In: Journal of Transport & Health20101004 Elsevier Ltd
The physical and mental health benefits of cycling are well established. During the COVID-19 pandemic cycling has also presented additional health benefits by enabling social distancing compared to public transport modes. In low-cycling countries these benefits are unevenly realised, with substantial differences in cycling mode share by age and gender. In England and Wales women are four times less likely to commute by bicycle than men; and commuters aged 35–49 cycle more than other age categories. This paper explores these demographic effects and their interactions. It uses logit models to examine the relationship between 17 determinants of cycling mode share and cycling rates for six demographic groups (males and females in age categories of 18-34, 35–49 and 50–74) across 29,694 small geographic units in England and Wales. The determinants comprise: distance; population density; cycle paths; cycle lanes; traffic density; hilliness; temperature; sun; rain; wind; wealth; lower social status; children; green votes; bicycle performance; traffic risk and parking costs. Determinants associated with physical effort (hilliness and distance) and traffic (traffic density and cycle lanes) are more important in the older age groups for both men and women. More important than the qualitative mix of determinants is their combined effect, or utility. Women require a higher threshold of utility to start cycling than men; and in higher utility environments gender differences are almost non-existent. Differences in cycling rates by age-group also reduce in higher utility environments, although the effects are less pronounced and older commuters still cycle less than other age-groups even in the highest utility environemnts. The results provide insight into the relative importance of gender versus age, and illustrate that cycling rates are more strongly associated with gender than age. For both dimensions, better cycling environments are shown to be more equal cycling environments. •The analysis examines interactions between age, gender and determinants of cycling.•Gender has a greater influence on commuter cycling behaviours than age.•Physical and risk factors may be more important for older commuters.•More supportive cycling environments are more equal in terms of both age and gender.
Like Jiang, Alex Hagen-Zanker, Prashant Kumar, John Pritchard (2021)Equity in job accessibility and environmental quality in a segmented housing market: The case of Greater London, In: Journal of Transport Geography90 Elsevier Ltd
Job accessibility and environmental quality are rarely equally distributed in spatial and/or social dimensions within metropolitan regions. Availability of these affects the quality of residential locations, and can be expected to be capitalised into house prices. For prospective house owners, their options will be limited to sub housing markets within certain price bands depending on their available housing budgets. Availability and marginal prices of job accessibility and environmental quality, as well as trade-offs between them, might be different between these submarkets. Using Greater London as the case metropolitan region, this study explored such differences, to shed light on the role of housing market in equity and/or inequity in job accessibility, environmental quality and their interactions. Results of this study show that lower-price submarkets have advantages in job accessibility in terms of marginal price, but are disadvantaged in terms of availability. Differences are more mixed in marginal price and availability between the submarkets for environmental quality. When balancing job accessibility and environmental quality within constrained housing budgets, households in lower-price submarkets would find it relatively easier to gain job accessibility with less sacrifice on environmental quality as compared to those searching in higher-price submarkets, but hard to reach the higher levels of job accessibility that are mainly reserved for the higher-price submarkets. •Sub housing markets are defined by price band to reflect housing affordability.•Lower-price submarkets hardly reach most accessible places.•Lower-price submarkets only offer flats and no houses in moderately accessible places.•Trading off environmental quality for job accessibility is more rewarding in lower-price submarkets.
Infrastructure operators are facing the challenges of managing assets under pressures from reduced budgets, aging infrastructure and increasing travel demand. This happens in the context uncertain climate change prompting the need for ever more robust and flexible decision support tools. One major risk to bridges in both current and future climate conditions is bridge scour- the removal of riverbed material at bridge foundations due to the flow of water. Scour is the foremost cause of bridge failure both in the UK and worldwide. This thesis explores climate change impacts on the management of scour risk for national bridge stocks. To do this a selection of methods is compiled to model the chain of processes linking climate change to scour risk at a network level, exploring the role of key uncertainties. One main research finding is that the current scour assessment techniques used in Network Rail may be insensitive to the effects of climate change. This is a result of a number of factors, including the use of over-conservative models, exceedance probabilities and safety factors. This conservatism is not well understood and leads to the reduced ability of Network Rail to objectively assess bridge scour risk at a network level, which has repercussions both in the context of current and future climate. Another key finding is that climate change uncertainty, which is largely aleatory, may in some cases be overshadowed by asset uncertainties, which can be reduced. Some model inputs, such as floodplain width and abutment width, are found to be both subjected to high uncertainty and also influential for the estimation of scour risk, leading to reduction in the confidence in scour risk assessments. Understanding model sensitivities and the relevant uncertainties would enable bridge operators to improve the quality of scour risk assessments by improving the quality of relevant data. This thesis makes a number of key recommendations that will enable Network Rail and other bridge stock managers to effectively adapt scour risk management practices for national bridge stocks to climate change.
The bicycle is an efficient way to travel. There are individual and population-level health and wellbeing benefits that arise when more people cycle. However, cycling is rare in England and Wales and commuter cyclists are disproportionately likely to be male and middle aged (35 to 49). Society therefore misses out on the wider benefits of higher cycling levels, and women and certain age groups miss out on the individual level benefits. This thesis uses geospatial analysis to examine cycling behaviours at multiple scales, seeking to understand the interactions between demographics and causal factors of commuter cycling mode share. It also examines the influence of vehicular traffic in detail and considers what actions local authorities might take to increase cycling levels. Using both aggregate (area-based) and network (route based) modelling approaches, it identifies that the most important factors influencing cycling behaviours are hilliness, traffic, wealth, temperature and population density. Whilst these and other factors differ somewhat in their relative importance between demographic groups, differences in cycling rates are best explained by group-specific responses to the combined influence of all factors – the relative utility of cycling. On average, women and older (>49) or younger (<35) commuters require a higher level of utility before they start cycling to work. Findings also show how the different traffic characteristics of a commuter’s route to work - such as vehicle speed, volume and direction - have distinct individual and combined influences on cycling propensity. Vehicle speeds are shown to be the most influential traffic characteristic. Policy should work towards making urban areas compact, dense and traffic free, with vehicle speeds under 30kph and with suitable levels of cycling infrastructure along key corridors to work. Urban form should be designed primarily with female cyclists in mind and male cyclists will benefit accordingly.
A Hagen-Zanker, G Engelen, J Hurkens, R Vanhout, I Uljee (2006)Map Comparison Kit 3: User Manual Research Institute for Knowledge Systems
A Hagen-Zanker (2007)Quantification and classification of urban change patterns, In: Proceedings of the 9th International Conference on Geocomputationpp. 1-3 National University of Ireland
Nick Grudgings, Alex Hagen-Zanker, Susan Hughes, Birgitta Gatersleben, Marc Woodall, Will Bryans (2018)Why don't more women cycle? An analysis of female and male commuter cycling mode-share in England and Wales, In: Journal of Transport and Health10pp. 272-283 Elsevier
Women are under-represented in commuter cycling in England and Wales. Consequently, women miss out on the health benefits of active commuting over distances where walking is less practical. Similarly, where cycling could replace motorised forms of transport, society is missing out on the wider health benefits associated with reductions in air pollution, road noise and social severance. This paper uses aggregate (ecological) models to investigate the reasons behind the gender gap in cycling. The relative attractiveness of cycling in different areas is described using a set of 17 determinants of commuter cycling mode share: distance, population density, cycle paths, cycle lanes, traffic density, hilliness, temperature, sun, rain, wind, wealth, lower social status, children, green votes, bicycle performance, traffic risk and parking costs. The correlation between these determinants and census-recorded cycling mode share is examined in logit models for commuters who work 2-5 km from home. The models explain a large share of the variation in cycling levels. There are small but significant differences in the importance of individual determinants between men and women. However, the gender gap is largely explained by a differentiated response to the relative attractiveness of an area for cycling, the sum effect of all determinants. The ratio of male to female cycling rates is greatest in areas that are less attractive for cycling, whereas in the most attractive areas the ratio approaches parity. On average, women require a more conducive environment for cycling than men. Since the typical environment in England and Wales is not conducive for cycling, women are under-represented in commuter cycling rates and miss out on the health dividend. The results suggest improvements to the cycling environment may be moderated by the existing attractiveness of the environment for cycling, with improvements in less attractive areas having a smaller absolute effect on cycling rates.
A Hagen-Zanker (2007)A state-space representation for measuring urban change, In: 7th IALE World Congresspp. 870-871 IALE
Alex Hagen-Zanker, B Straatman, I Uljee (2005)Further developments of a fuzzy set map comparison approach, In: International Journal of Geographical Information Science19pp. 769-785
Fuzzy set map comparison offers a novel approach to map comparison. The approach is specifically aimed at categorical raster maps and applies fuzzy set techniques, accounting for fuzziness of location and fuzziness of category, to create a similarity map as well as an overall similarity statistic: the Fuzzy Kappa. To date, the calculation of the Fuzzy Kappa (or K-fuzzy) has not been formally derived, and the documented procedure was only valid for cases without fuzziness of category. Furthermore, it required an infinitely large, edgeless map. This paper presents the full derivation of the Fuzzy Kappa; the method is now valid for comparisons considering fuzziness of both location and category and does not require further assumptions. This theoretical completion opens opportunities for use of the technique that surpass the original intentions. In particular, the categorical similarity matrix can be applied to highlight or disregard differences pertaining to selected categories or groups of categories and to distinguish between differences due to omission and commission.
L Llano, MK Chryssanthopoulos, A Hagen-Zanker, MI Rafiq (2013)Stochastic modeling of chloride-induced pitting corrosion of reinforcement bars in concrete, In: Safety, Reliability, Risk and Life-Cycle Performance of Structures and Infrastructures - Proceedings of the 11th International Conference on Structural Safety and Reliability, ICOSSAR 2013pp. 2659-2664
Chloride induced corrosion, caused primarily by salt spray in marine environments, airborne salts and de-icing salts, is one of the most common deterioration processes in reinforced concrete structures. At present, most of the models found in literature describe uniform corrosion and those that do address localized corrosion focus on a simplified definition of the reduced cross-sectional area of corroded rebars without due attention to physical characteristics and spatial variability. This may be attributed to the limitations of current manual methods used in evaluating the corrosion characteristics on the surface of reinforcement. In this paper, an automated procedure for the acquisition of corrosion depth data on rebars based on 3D laser scanning is investigated. Moreover, the first results of an analysis process based on image analysis using wavelet theory are presented. These results show a promising way of improving the classification of corrosion depths. This can be useful for the relation between spatial distribution of corrosion and mechanical properties of the corroded element. © 2013 Taylor & Francis Group, London.
A Hagen-Zanker (2006)Map Comparison Kit: Beta extension for continuous valued data Research Institute for Knowledge Systems (RIKS)
A Hagen-Zanker (2006)Map comparison methods that simultaneously address overlap and structure, In: Journal of Geographical Systems8pp. 165-185
Alex Hagen-Zanker, Hristo Dikanski, Boulent Imam, K Avery (2017)Climate change impacts on railway structures: bridge scour, In: Proceedings of the Institution of Civil Engineers: Engineering Sustainability170(5)pp. 237-248 ICE Publishing
Weather-related disruption is a pressing issue for transport infrastructure in the UK, which is expected to aggravate due to climate change. Infrastructure managers, such as Network Rail, need to adapt to these changes, tackling the challenges brought about by wide-ranging uncertainties from various sources. This paper explores the relationship between climate change and bridge scour, identifying barriers to sustainable adaptation. Scour is the removal of riverbed material at bridge foundations due to hydraulic action and is the foremost cause of bridge failure in the UK and worldwide. A model is developed that simulates the causal chain from climate change to scour risk. This is applied to four case study bridges in Wales and the south-west of England, quantifying the effects of climate change and tracing key uncertainties in the process. Results show that the current scour risk models in Network Rail may be insensitive to increases in risk due to climate change. One way to tackle this may be to introduce models to assess absolute risk; current scour risk models are used only for the prioritisation of vulnerable sites.
I Rivas, Prashant Kumar, Alex Hagen-Zanker (2017)Exposure to air pollutants during commuting in London: are there inequalities among different socio-economic groups?, In: Environment International101pp. 143-157 Elsevier
People with low-income often experience higher exposures to air pollutants. We compared the exposure to particulate matter (PM1, PM2.5 and PM10), Black Carbon (BC) and ultrafine particles (PNC; 0.02-1 µm) for typical commutes by car, bus and underground from 4 London areas with different levels of income deprivation (G1 to G4, from most to least deprived). The highest BC and PM concentrations were found in G1 while the highest PNC in G3. Lowest concentrations for all pollutants were observed in G2. We found no systematic relationship between income deprivation and pollutant concentrations, suggesting that differences between transport modes are a stronger influence. The underground showed the highest PM concentrations, followed by buses and a much lower concentrations in cars. BC concentrations in the underground were overestimated due to Fe interference. BC concentrations were also higher in buses than cars because of a lower infiltration of outside pollutants into the car cabin. PNCs were highest in buses, closely followed by cars, but lowest in underground due to the absence of combustion sources. Concentration in the road modes (car and bus) were governed by the traffic conditions (such as traffic flow interruptions) at the specific road section. Exposures were reduced in trains with non-openable windows compared to those with openable windows. People from lower income deprivation areas have a predominant use of car, receiving the lowest doses (RDD<1 µg h-1) during commute but generating the largest emissions per commuter. Conversely, commuters from higher income deprivation areas have a major reliance on the bus, receiving higher exposures (RDD between 1.52-3.49 µg h-1) while generating less emissions per person. These findings suggest an aspect of environmental injustice and a need to incorporate the socioeconomic dimension in life-course exposure assessments.
A Hagen-Zanker (2009)An improved Fuzzy Kappa statistic that accounts for spatial autocorrelation, In: International Journal of Geographical Information Science23pp. 61-73
The Fuzzy Kappa statistic expresses the agreement between two categorical raster maps. The statistic goes beyond cell-by-cell comparison and gives partial credit to cells based on the categories found in the neighborhood. When matching categories are found at shorter distances the agreement is higher. Like the well-established Kappa statistic the Fuzzy Kappa statistic expresses the mean agreement relative to the expected agreement. The model underlying the expected agreement assumes absence of spatial autocorrelation in both compared maps. In reality however, spatial autocorrelation does lower the expected agreement as matching categories become less likely to be found close-by. Since most maps have some degree of spatial autocorrelation, the calculated expected agreement is generally higher than the true expected agreement. This leads to counterintuitive results when maps that appear to have considerable agreement obtain negative Fuzzy Kappa values. Furthermore, the Fuzzy Kappa may be biased, as it systematically attributes lower agreement to maps with stronger spatial autocorrelation. This paper proposes an improved Fuzzy Kappa statistic that is based on the same local agreement and has the same attractive properties as the original Fuzzy Kappa. The novelty is that the new statistic accounts for spatial autocorrelation, such that the expected Fuzzy Kappa for maps that are not cross-correlated is equal to zero. The improved statistic is applied on two cases to demonstrate its properties.
Hristo Dikanski, Boulent Imam, Alex Hagen-Zanker (2017)Effects of uncertain asset stock data on the assessment of climate change risks: a case study of bridge scour in the UK, In: Structural Safety71pp. 1-12 Elsevier
Bridge owners worldwide manage large numbers of assets with limited budgets through risk assessments, using asset-specific data. However, when managing a large stock of aging assets, maintaining robust and up-to-date data records can be challenging. This issue comes to the fore when trying to understand asset vulnerability to current and future weather events in the context of a changing climate. By using a sample of data on railway bridges in the UK, this paper explores uncertainty associated with raw data used in bridge scour risk assessments for bridge stocks and its interaction with climate change uncertainty. Results indicate that our ability to foresee climate change impacts is not only limited by the aleatory uncertainty of climate change projections; avoidable uncertainty in basic asset data can outweigh aleatory uncertainty by an order of magnitude. Some parameters, such as floodplain width and the width of abutments, were found to be both subject to high uncertainty and also very influential for the estimation of scour risk, leading to reduction in the confidence in scour risk assessments. This finding contrasts with the unchallenged assumption in the field that dimensions of bridge elements are not associated with uncertainty. The nature of scour implies that a potential increase in the frequency and severity of extreme weather events will increase scour risk. This paper shows that in order to be able to understand and account for this increase, scour management processes must effectively address data uncertainty. Active measures to control data quality would be an effective step towards understanding and managing bridge resilience in the context of current and future climatic conditions.
AH Hagen-Zanker, Y Jin (2015)Adaptive Zoning for Efficient Transport Modelling in Urban Models, In: Computational Science and Its Applications -- ICCSA 20159157pp. 673-687 Springer
Transport modelling and in particular transport assignment is a well-known bottleneck in computation cost and time for urban system models. The use of Transport Analysis Zones (TAZ) implies a trade-off between computation time and accuracy: practical computational constraints can lead to concessions to zone size with severe repercussions for the quality of the transport representation in urban models. This paper investigates how a recently developed geographical topology called adaptive zoning can be used to obtain more favorable trade-offs between computational cost and accuracy than traditional TAZ. Adaptive zoning was developed specifically for representing spatial interactions; it makes use of a nested zone hierarchy to adapt the model resolution as a function of both the origin and destination location. In this paper the adaptive zoning method is tied to an approach to trip assignment that uses high spatial accuracy (small zones) at one end of the route and low spatial accuracy (large zones) at the other end of the route. Opportunistic use of either the first or second half of such routes with asymmetric accuracy profiles leads to a method of transport assignment that is more accurate than traditional TAZ based assignment at reduced computational cost. The method is tested and demonstrated on the well-known Chicago Regional test problem. Compared with an assignment using traditional zoning, an adaptive-zoning-based assignment that uses the same computation time reduces the bias in travel time by a factor 16 and link level traffic volume RMSE by a factor 6.4.
A Hagen-Zanker, P Martens (2011)A framework of map comparison methods to evaluate geosimulation models from a geospatial perspective, In: Geocomputation, Sustainability and Environmental Planningpp. 251-269 Springer Berlin / Heidelberg
Geosimulation is a form of microsimulation that seeks to understand geographical patterns and dynamics as the outcome of micro level geographical processes. Geosimulation has been applied to understand such diverse systems as lake ecology, traffic congestion and urban growth. A crucial task common to these applications is to express the agreement between model and reality and hence the confidence one can have in the model results. Such evaluation requires a geospatial perspective; it is not sufficient if the micro-level interactions are realistic. Importantly the interactions should be such that the meso and macro level patterns that emerge from the model are realistic. In recent years, a host of map comparison methods have been developed that address different aspects of the agreement between model and reality. This paper places such methods in a framework to systematically assess the breadth and width of model performance. The framework expresses agreement at the continuum of spatial scales ranging from local to the whole landscape and separately addresses agreement in structure and presence. A common reference level makes different performance metrics mutually comparable and guides the interpretation of results. The framework is applied for the evaluation of a constrained cellular automata model of the Netherlands. The case demonstrates that a performance assessment lacking either a multi-criteria and multi-scale perspective or a reference level would result in an unbalanced account and ultimately false conclusions.
After having set out the challenges connected with land ownership and real estate in the insular, micro context of Reunion Island, we plan to create a robot land-use model based on satellite images integrated with a cellular robot. Once the general framework of the modelling has been established, we will make the case for calibrating the cellular robot, and will discuss four scenarios in an approach to long-term territorial planning. La problématique de l'usage du sol à La Réunion.
AH Hagen-Zanker (2009)New ways of supporting decision making: linking qualitative storylines with quantitative modelling, In: Planning Support Systems Best Practice and New Methods95pp. 347-367 Springer
To explore how people will live and work in Europe, what the landscape will look like and what the environmental consequences will be in some 35 years from now, the PRELUDE project (EEA 2007) of the European Environment Agency developed five different land-use scenarios for Europe. The project was carried out according to a Story And Simulation (SAS) approach in which, iteratively, storylines developed in participatory sessions are underpinned by land-use models. Storylines in this context are defined as narratives about future developments in Europe. They provide qualitative information on a broad range of issues in an integrated context.
A Hagen-Zanker, HJP Timmermans (2008)A metric of compactness of urban change illustrated to 22 European countries, In: Lecture Notes in Geoinformation and Cartography: The European Information Society, Taking Geoinformation Science One Step Furtherpp. 181-200 Springer Berlin Heidelberg
Most metrics of urban spatial structure are snapshots, summarizing spatial structure at one particular moment in time. They are therefore not ideal for the analysis of urban change patterns. This paper presents a new spatio-temporal analytical method for raster maps that explicitly registers changesin patterns. The main contribution is a transition matrix which cross-tabulates the distance to the nearest urbanized location at the beginning and end of the analyzed period. The transition matrix by itself offers a powerful description of urban change patterns from which further metrics can be derived. In particular, a metric that is an indicator of the compactness of urban change is derived. The new metric is applied first to a synthetic dataset demonstrating consistency with existing classifications of urban change patterns. Next, the metric is applied country by country on the European CORINE land cover dataset. The results indicate a striking contrast in change patterns between Western and Eastern European counties. The method can be further elaborated in many different ways and can therefore be the first in a family of spatio-temporal descriptive statistics.
I Rivas, Prashant Kumar, Alex Hagen-Zanker, M Andrade, AD Slovic, JP Pritchard, KT Geurs (2017)Determinants of black carbon, particle mass and number concentrations in London transport microenvironments, In: Atmospheric Environment161pp. 247-262 Elsevier
We investigated the determinants of personal exposure concentrations black carbon (BC), ultrafine particle number concentrations (PNC), and particulate matter (PM1, PM2.5 and PM10) in different travel modes. We quantified the contribution of key factors that explain the variation of the previous pollutants in four commuting routes in London, each covered by four transport modes (car, bus, walk and underground). Models were performed for each pollutant, separately to assess the effect of meteorology (wind speed) or ambient concentrations (with either high spatial or temporal resolution). Concentration variations were mainly explained by wind speed or ambient concentrations and to a lesser extent by route and period of the day. In multivariate models with wind speed, the wind speed was the common significant predictor for all the pollutants in the above-ground modes (i.e., car, bus, walk); and the only predictor variable for the PM fractions. Wind speed had the strongest effect on PM during the bus trips, with an increase in 1 m s-1 leading to a decrease in 2.25, 2.90 and 4.98 μg m-3 of PM1, PM2.5 and PM10, respectively. PM2.5 and PM10 concentrations in car trips were better explained by ambient concentrations with high temporal resolution although from a single monitoring station. On the other hand, ambient 32 concentrations with high spatial coverage although lower temporal resolution predicted better the concentrations in bus trips, due to bus routes passing through streets with a high variability of traffic intensity. In the underground models, wind speed was not significant and line and type of windows on the train explained 42% of the variation of PNC and 90% of all PM fractions. Trains in the district line with openable windows had an increase in concentrations of 1684 cm-3 for PNC and 40.69 μg m-3 for PM2.5 compared with trains that has non-openable windows. The results from this work can be used to target efforts to reduce personal exposures of London commuters.
Michael G. Hutchins, Scott J. McGrane, James D. Miller, Alex Hagen-Zanker, Thomas R. Kjeldsen, Simon J. Dadson, Clare S. Rowland (2016)Integrated modeling in urban hydrology: reviewing the role of monitoring technology in overcoming the issue of ‘big data’ requirements, In: Wiley Interdisciplinary Reviews: Water4(1) Wiley
Increasingly, the application of models in urban hydrology has undergone a shift toward integrated structures that recognize the interconnected nature of the urban landscape and both the natural and engineered water cycles. Improvements in computational processing during the past few decades have enabled the application of multiple, connected model structures that link previously disparate systems together, incorporating feedbacks and connections. Many applications of integrated models look to assess the impacts of environmental change on physical dynamics and quality of landscapes. Whilst these integrated structures provide a more robust representation of natural dynamics, they often place considerable data requirements on the user, whereby data are required at contrasting spatial and temporal scales which can often transcend multiple disciplines. Concomitantly, our ability to observe complex, natural phenomena at contrasting scales has improved considerably with the advent of increasingly novel monitoring technologies. This has provided a pathway for reducing model uncertainty and improving our confidence in modeled outputs by implementing suitable monitoring regimes. This commentary assesses how component models of an exemplar integrated model have advanced over the past few decades, with a critical focus on the role of monitoring technologies that have enabled better identification of the key physical process. This reduces the uncertainty of processes at contrasting spatial and temporal scales, through a better characterization of feedbacks which then enhances the utility of integrated model applications.
Chloride-induced corrosion is regarded as one of the most important sources of deterioration in reinforced concrete (RC) structures, whose maintenance during their service life is of foremost importance in order to avoid unnecessary human risks and economic losses. The availability of effective mechanisms for quantifying the condition and performance of these structures is, therefore, indispensable. The search for improved methods to assess this type of corrosion and its impact on tensile mechanical properties is the main objective of this research. Time variant non-spatial models are currently the methods of choice for the assessment of the effect of corrosion on the mechanical properties of reinforcing bars. Although these models, based on the relationship between mechanical properties and critical points in the geometry, give fairly good predictions, they still leave room for improvement. The consideration of the spatial component of corrosion has barely been addressed in relation to reinforcing bars embedded in concrete. Thus, the present study focuses on the spatial structure of chloride-induced corrosion on steel reinforcing bars and its effects on mechanical properties using a variety of approaches. The use of innovative techniques, originating from different disciplines and applications, has offered new possibilities in tackling this problem. First, based on the application of anodic current to steel reinforcing bars embedded in concrete from an external power source, a set of artificially corroded bars, at different degrees of severity, was produced. The use of a three-dimensional (3D) computerized imaging methodology was utilised to characterise these rebars in terms of a grid of corrosion depth measurements. After the acquisition of these measurements, use was made of a variety of surface metrology and image analysis techniques, through which a number of intensity, texture and shape corrosion quantifiers have been proposed for the spatial characterisation of corrosion patterns. Surface-metrological based parameters and image analysis-based features were found to yield useful metrics to investigate the corrosion structure of corroded rebars. The lack of an objective definition for a pit could be overcome with the characterisation of corrosion defects in terms of their depth and size using image segmentation. All the corroded bars were subjected to a uniaxial tension test and the relevant tensile mechanical properties throughout the strain-stress response were recorded. It was confirmed that traditional non-spatial corrosion models had limitations in terms of identifying and utilising a single corrosion quantifier, and, as a result, the introduction of different possible spatial corrosion quantifiers was investigated, in order to improve the model performance. It was concluded that the addition of spatial quantifiers as predictors, resulted in improved predictions of mechanical properties, compared to the currently used non-spatial models. However, for the range of corrosion levels examined in this study, the improvement in the prediction was relatively modest (circa 10% on the coefficient of determination), confirming the maximum corrosion depth or the minimum cross-sectional area as the pre-eminent quantifiers. The range of techniques developed in this thesis can be implemented in other applications where spatial corrosion characteristics need to be explored.

Additional publications