ArcGIS to Unity: a design pipeline for creation of 3D terrain in serious egames for geology          下载免费PDF全文

Annabeth Robinson  Clare E. Gordon  Jacqueline Houghton  Geoffrey E. Lloyd  Daniel J. Morgan 《Geology Today》2015,31(6):237-240

One of the key challenges during the development of the Virtual World Project ‘egame environment’ discussed in this issue was the creation of the digital virtual landscape from an original 2002 base map of a field area. In this [online] paper we will walk through the design pipeline that was developed by the virtual worlds project team, and discuss some of the issues that were discovered when translating from a 2D map to a 3D environment using available software, for others interested in replicating this work.  相似文献   

Probabilistic spatial risk assessment of heat impacts and adaptations for London     

Katie Jenkins  Jim Hall  Vassilis Glenis  Chris Kilsby  Mark McCarthy  Clare Goodess  Duncan Smith  Nick Malleson  Mark Birkin 《Climatic change》2014,124(1-2):105-117

High temperatures and heatwaves can cause large societal impacts by increasing health risks, mortality rates, and personal discomfort. These impacts are exacerbated in cities because of the Urban Heat Island (UHI) effect, and the high and increasing concentrations of people, assets and economic activities. Risks from high temperatures are now widely recognised but motivation and implementation of proportionate policy responses is inhibited by inadequate quantification of the benefits of adaptation options, and associated uncertainties. This study utilises high spatial resolution probabilistic projections of urban temperatures along with projections of demographic change, to provide a probabilistic risk assessment of heat impacts on urban society. The study focuses on Greater London and the surrounding region, assessing mortality risk, thermal discomfort in residential buildings, and adaptation options within an integrated framework. Climate change is projected to increase future heat-related mortality and residential discomfort. However, adjusting the temperature response function by 1–2 °C, to simulate adaptation and acclimatisation, reduced annual heat related mortality by 32–69 % across the scenarios tested, relative to a no adaptation scenario. Similar benefits of adaptation were seen for residential discomfort. The study also highlights additional benefits in terms of reduced mortality and residential discomfort that mitigating the urban heat island, by reducing albedo and anthropogenic heat emissions, could have.  相似文献   

Calving retreat and proglacial lake growth at Hooker Glacier,Southern Alps,New Zealand     

Clare M. Robertson  Martin S. Brook  Kat A. Holt  Ian C. Fuller  Douglas I. Benn 《New Zealand geographer》2013,69(1):14-25

Hooker Glacier in the central Southern Alps of New Zealand has undergone significant downwasting and recession (～2.14 km) during the last two centuries. High retreat rates (51 m a^?1 1986–2001, 43 m a^?1 2001–2011) have produced a large (1.22 km²) proglacial lake. We present a retreat scenario for Hooker Glacier. A retreat scenario predicts that the glacier terminus will stabilise >3 km up‐valley of the current lake outlet after 2028 when ice velocity equals calving rate.  相似文献   

The political ecology of alcohol as “disaster” in South Africa’s Western Cape     

Clare Herrick 《Geoforum》2012,43(6):1045-1056

While attention to the socio-ecological and political economic influences on health grows, there remains a paucity of political ecological analyses of health (King, 2010). At the same time, the growing burden of non-communicable diseases (NCDs) in the Global South demands new conceptual and pragmatic engagements with their modifiable risk factors. Drawing on the example of South Africa, this paper argues that alcohol consumption might usefully be theorised in political ecological lexicon as a “disaster”. To do so, it draws attention to the upstream causes of vulnerability, rather than just the downstream effects of risky drinking. This reorientation is needed for sustainable, publicly acceptable alcohol policies. To realise this, it draws on Blaikie et al.’s (1994, 2003) political ecological approach to risk, vulnerability and coping and, more specifically, applies their Pressure and Release model to explore liquor as a situated “disaster” in South Africa’s Western Cape province. In so doing, it aims to mark out an under-explored research agenda that considers alcohol as a pervasive governance dilemma. In addition, it also reflects on the model’s utility as a means of communicating findings that might reorient policy discussions on alcohol control in both South Africa and countries of the Global South.  相似文献   

Rare Earth Element Determination in Olivine by Laser Ablation‐Quadrupole‐ICP‐MS: An Analytical Strategy and Applications          下载免费PDF全文

Clare V. Stead  Emma L. Tomlinson  Balz S. Kamber  Michael G. Babechuk  Cora A. McKenna 《Geostandards and Geoanalytical Research》2017,41(2):197-212

Olivine offers huge, largely untapped, potential for improving our understanding of magmatic and metasomatic processes. In particular, a wealth of information is contained in rare earth element (REE) mass fractions, which are well studied in other minerals. However, REE data for olivine are scarce, reflecting the difficulty associated with determining mass fractions in the low ng g^?1 range and with controlling the effects of LREE contamination. We report an analytical procedure for measuring REEs in olivine using laser ablation quadrupole‐ICP‐MS that achieved limits of determination (LOD) at sub‐ng g^?1 levels and biases of ~ 5–10%. Empirical partition coefficients (D values) calculated using the new olivine compositions agree with experimental values, indicating that the measured REEs are structurally bound in the olivine crystal lattice, rather than residing in micro‐inclusions. We conducted an initial survey of REE contents of olivine from mantle, metamorphic, magmatic and meteorite samples. REE mass fractions vary from 0.1 to double‐digit ng g^?1 levels. Heavy REEs vary from low mass fractions in meteoritic samples, through variably enriched peridotitic olivine to high mass fractions in magmatic olivines, with fayalitic olivines showing the highest levels. The variable enrichment in HREEs demonstrates that olivine REE patterns have petrological utility.  相似文献   

Biological reduction of chlorinated solvents: Batch-scale geochemical modeling     

Irina Kouznetsova  Xiaomin Mao  Clare Robinson  D.A. Barry  Jason I. Gerhard  Perry L. McCarty 《Advances in water resources》2010

Simulation of biodegradation of chlorinated solvents in dense non-aqueous phase liquid (DNAPL) source zones requires a model that accounts for the complexity of processes involved and that is consistent with available laboratory studies. This paper describes such a comprehensive modeling framework that includes microbially mediated degradation processes, microbial population growth and decay, geochemical reactions, as well as interphase mass transfer processes such as DNAPL dissolution, gas formation and mineral precipitation/dissolution. All these processes can be in equilibrium or kinetically controlled. A batch modeling example was presented where the degradation of trichloroethene (TCE) and its byproducts and concomitant reactions (e.g., electron donor fermentation, sulfate reduction, pH buffering by calcite dissolution) were simulated. Local and global sensitivity analysis techniques were applied to delineate the dominant model parameters and processes. Sensitivity analysis indicated that accurate values for parameters related to dichloroethene (DCE) and vinyl chloride (VC) degradation (i.e., DCE and VC maximum utilization rates, yield due to DCE utilization, decay rate for DCE/VC dechlorinators) are important for prediction of the overall dechlorination time. These parameters influence the maximum growth rate of the DCE and VC dechlorinating microorganisms and, thus, the time required for a small initial population to reach a sufficient concentration to significantly affect the overall rate of dechlorination. Self-inhibition of chlorinated ethenes at high concentrations and natural buffering provided by the sediment were also shown to significantly influence the dechlorination time. Furthermore, the analysis indicated that the rates of the competing, nonchlorinated electron-accepting processes relative to the dechlorination kinetics also affect the overall dechlorination time. Results demonstrated that the model developed is a flexible research tool that is able to provide valuable insight into the fundamental processes and their complex interactions during bioremediation of chlorinated ethenes in DNAPL source zones.  相似文献   

Identifying farmer attitudes towards genetically modified (GM) crops in Scotland: Are they pro- or anti-GM?     

Clare Hall 《Geoforum》2008,39(1):204-212

The GM debate in the European Union has been consistently presented as being conflictual and contentious, characterised as being polarised into those who are pro-GM and those who are anti-GM. This is largely based on the positions adopted by the public (consumers), non-governmental organisations (NGOs), and industry and corporate bodies. One group largely lacking from this debate is farmers, and yet their decisions about whether or not to cultivate GM crops will be crucial to the future of the technology in European agriculture. This paper reports findings from a study investigating farmers’ attitudes to GM crops in Scotland using Q methodology. Results reveal three discourses, one inclined to be positive towards the idea of GM and demonstrating an expectation of benefits, the second representing a more uncertain position, wary of the potential risks of the technology but likely to be reluctant adopters, and the third describing a group who demonstrate a somewhat fatalistic attitude towards the issue of GM technology adoption and impact. These findings contribute to the GM debate by elaborating the views of this important stakeholder group and suggest that they may be less profoundly pro- or anti-GM than other groups involved in the debate. This is significant if they represent the ‘middle ground’ between the biotechnology industry and the public.  相似文献   

Evolution of Mesozoic fluvial systems along the SE flank of the West Siberian Basin, Russia     

Daniel Paul Le Heron  Micha M. Buslov  Clare Davies  Keith Richards  Inna Safonova 《Sedimentary Geology》2008,208(1-2):45-60

The Mesozoic stratigraphy in the subsurface of the West Siberian Basin contains prolific hydrocarbon accumulations, and thus the depositional environments of marine and marginal marine Jurassic and Cretaceous age sediments are well-established. However, no information is currently available on strata of equivalent age that crop out along the SE basin margin in the Mariinsk–Krasnoyarsk region, despite the potential of these exposures to supply important information on the sediment supply routes into the main basin. Detailed sedimentological analysis of Jurassic–Cretaceous clastic sediments, in conjunction with palaeo-botanical data, reveals five facies associations that reflect deposition in a range of continental environments. These include sediments that were deposited in braided river systems, which were best developed in the Early Jurassic. These early river systems infilled the relics of a topography that was possibly inherited from earlier Triassic rifting. More mature fluvial land systems evolved in the Mid to Late Jurassic. By the Mid Jurassic, well-defined overbank areas had become established, channel abandonment was commonplace, and mudrocks were deposited on floodplains. Coal deposition occurred in mires, which were subject to periodic incursions by crevasse splay processes. Cretaceous sedimentation saw a renewed influx of sand-grade sediment into the region. It is proposed that landscape evolution throughout the Jurassic was driven simply by peneplanation rather than tectonic processes. By contrast, the influx of sandstones in the Cretaceous is tentatively linked to hinterland rejuvenation/ tectonic uplift, possibly coeval with the growth of large deltaic clinoform complexes of the Neocomian in the basin subsurface.  相似文献   

Inter‐annual variation in the topographic controls on catchment‐scale snow distribution in a maritime alpine catchment,New Zealand          下载免费PDF全文

Clare S. Webster  Daniel G. Kingston  Tim Kerr 《水文研究》2015,29(6):1096-1109

Seasonal snow is a globally important water resource that contributes substantially to upland and lowland water resources. As such, there is a need to understand the controls on the spatial and temporal variation in snow distribution. This study meets this research need by investigating the topographic controls on snow depth distribution in the upper Jollie catchment in the Southern Alps of New Zealand. Furthermore, inter‐annual variation in the importance of the topographic controls is examined and linked to variation in the dominant synoptic‐scale weather patterns over a 4‐year period (2007–2010). Through the use of regression trees, the relative importance of the topographic controls on snow depth was shown to vary between the four study years. In particular, elevation explained the greatest amount of variance in 2007 and 2008 and east‐exposure explained the greatest variance in 2009 and 2010. The other wind exposure variables also had a large effect on the snow depth distribution in 2009 and 2010. Differences in the frequency and duration of synoptic weather patterns were physically consistent with the changing importance of these variables. In particular, a higher frequency of troughing events in 2009 and 2010 is thought to be associated with a reduced importance of elevation and greater influence of wind exposure on snow depth in these years. These findings demonstrate the importance of using multi‐year data sets, and of considering topographic and climatic influences, when attempting to model alpine snow distribution. Copyright © 2014 John Wiley & Sons, Ltd.  相似文献   

Determining cooling rates from mica 40Ar/39Ar thermochronology data: Effect of cooling path shape     

Christopher S. McDonald  Clare J. Warren  Felix Hanke  Julian Chard 《地学学报》2019,31(3):234-246

Tectonic models are commonly underpinned by metamorphic cooling rates derived from diffusive‐loss thermochronology data. Such cooling ages are usually linked to temperature via Dodson's closure temperature (T_C) formulation, which specifies a 1/time‐shaped cooling path (Contributions to Mineralogy and Petrology, 1973, 40, 259). Geologists, however, commonly discuss cooling rates as a linear temperature/time shape. We present the results of a series of simple finite‐difference diffusion models for Ar diffusion in muscovite and biotite that show that the difference in recorded age between 1/t and linear cooling paths increases significantly with hotter starting temperatures, slower cooling rates and smaller grain sizes. Our results show that it is essential to constrain the cooling path shape in order to make meaningful interpretations of the measured data.  相似文献