Incorporating climate change and morphological uncertainty into coastal change hazard assessments     

Heather M. Baron  Peter Ruggiero  Nathan J. Wood  Erica L. Harris  Jonathan Allan  Paul D. Komar  Patrick Corcoran 《Natural Hazards》2015,75(3):2081-2102

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Jenniferann.com,regional development,and realising the aspirations of mana whenua in Pōkeno     

John Ryks  Jonathan Kilgour  Jesse Whitehead  Amy Whetu  James Whetu 《New Zealand geographer》2019,75(3):152-162

During the 1990s, the township of Pōkeno was held up as an example of a declining rural Aotearoa/New Zealand. By‐passed from the national state highway, it lost its status as a service hub and drastic measures were introduced to revitalise the town, including renaming the town “ Jenniferann.com .” Pōkeno has since undergone an unlikely transformation, with foreign investment and its location within an extended Auckland commuter zone meaning that the township has grown exponentially. This article describes the transformation of Pōkeno and uncovers what has been missing from discussions about Pōkeno's reinvention, namely, the place of mana whenua.  相似文献   

Evaluation of regional ocean circulation models for the Mediterranean Sea at the Strait of Gibraltar: volume transport and thermohaline properties of the outflow     

Javier Soto-Navarro  Samuel Somot  Florence Sevault  Jonathan Beuvier  Francisco Criado-Aldeanueva  Jesús García-Lafuente  Karine Béranger 《Climate Dynamics》2015,44(5-6):1277-1292

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English Jurassic Limestone Country: Stroud,Central Cotswolds          下载免费PDF全文

Jonathan Paul 《Geology Today》2015,31(1):28-32

The area around Stroud, a small English market town perched on the steep west‐facing Cotswold escarpment, offers some of the most dramatic outcrops of Jurassic limestone in the UK. From sweeping vistas of the Severn Vale, to the deeply wooded river valleys that indent the escarpment, its landscape is undeniably one of the area's greatest assets. Recently, the geology and physiography of the landscape has been drawn into close focus by several notable UK media stories: protests against hydraulic fracturing (fracking) in the underlying Lias clays; landslides causing weeks of repeated disruption across the Cotswold road and railway networks; and the recent death of a local engineer in a pit collapse of Fuller's Earth. In order to understand these stories in greater depth, it is useful to consider the story of Stroud's unique physical setting.  相似文献   

Joint modelling of wave spectral parameters for extreme sea states     

Philip Jonathan  Jan Flynn  Kevin Ewans 《Ocean Engineering》2010,37(11-12):1070-1080

Characterising the dependence between extremes of wave spectral parameters such as significant wave height (H_S) and spectral peak period (T_P) is important in understanding extreme ocean environments and in the design and assessment of marine structures. For example, it is known that mean values of wave periods tend to increase with increasing storm intensity. Here we seek to characterise joint dependence in a straightforward manner, accessible to the ocean engineering community, using a statistically sound approach.Many methods of multivariate extreme value analyses are based on models which assume implicitly that in some joint tail region each parameter is either independent of or asymptotically dependent on other parameters; yet in reality the dependence structure in general is neither of these. The underpinning assumption of multivariate regular variation restricts these methods to estimation of joint regions in which all parameters are extreme; but regions where only a subset of parameters are extreme can be equally important for design. The conditional approach of Heffernan and Tawn (2004), similar in spirit to that of Haver (1985) but with better theoretical foundation, overcomes these difficulties.We use the conditional approach to characterise the dependence structure of H_S and T_P. The key elements of the procedure are: (1) marginal modelling for all parameters, (2) transformation of data to a common standard Gumbel marginal form, (3) modelling dependence between data for extremes of pairs of parameters using a form of regression, (4) simulation of long return periods to estimate joint extremes. We demonstrate the approach in application to measured and hindcast data from the Northern North Sea, the Gulf of Mexico and the North West Shelf of Australia. We also illustrate the use of data re-sampling techniques such as bootstrapping to estimate the uncertainty in marginal and dependence models and accommodate this uncertainty in extreme quantile estimation.We discuss the current approach in the context of other approaches to multivariate extreme value estimation popular in the ocean engineering community.  相似文献   

A diatom‐inferred record of lake variability during the last 900 years in Lützow–Holm Bay,East Antarctica          下载免费PDF全文

Rachel C. Rudd  Jonathan J. Tyler  John Tibby  Yusuke Yokoyama  Ines Tavernier  Elie Verleyen  Manabu Fukui  Yoshinori Takano 《第四纪科学杂志》2016,31(2):114-125

Decadal–centennial‐scale climate variability in coastal Antarctica remains poorly understood due to the limited number of highly resolved, well‐dated records. We present a 900‐year, decadal‐scale reconstruction based on sedimentary diatoms from Lake Abi in Lützow–Holm Bay, East Antarctica. Hydrological change is inferred from diatom ecological preferences in conjunction with an existing regional training set and implies that lake water specific conductivity, depth and nitrogen availability are the key drivers of diatom assemblage change. Lake Abi underwent a series of subtle environmental changes related to these environmental variables, possibly driven by changes in catchment snow melt and the duration of seasonal ice cover. Ordination is used to trace the major patterns of change in the diatom community, with notable shifts identified between 470 and 400 and at ～350 cal a BP (where present = CE 1950). The frequency of environmental variability at Lake Abi is broadly consistent with a record of the Interdecadal Pacific Oscillation during the last millennium, but contrasts with the apparent climate stability elsewhere in eastern Antarctica. Further research is required to constrain the limnological and ecological responses of lakes in coastal Antarctica to obtain more rigorous palaeoclimate reconstructions from these sites of immense potential.  相似文献   

Approach to calculating spatial similarity degrees of the same river basin networks on multi-scale maps     

Haowen Yan  Yuzhong Shen  Jonathan Li 《国际地球制图》2016,31(7):765-782

Obtaining spatial similarity degrees among the same objects on multi-scale maps is of importance in map generalization. This paper firstly defines the concepts of ‘map scale change’ and ‘spatial similarity degree’; then it proposes a model for calculating the spatial similarity degree between a river basin network at one scale and its generalized version at another scale. After this, it validates the new model and gets 16 points in the model validation process. The x-coordinate and y-coordinate of each point are map scale change and spatial similarity degree, respectively. Last, a formula for calculating spatial similarity degree taking map scale change as the only variable is obtained by the curve fitting method. The formula along with the model can be used to automate the algorithms for simplifying river basin networks.  相似文献   

Assessing Illinois’s flood vulnerability using Hazus-MH     

Jonathan W. F. Remo  Nicholas Pinter  Moe Mahgoub 《Natural Hazards》2016,81(1):265-287

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Enrichment and toxicity of trace metals in near-shore bottom sediments of Cuddalore,SE coast of India     

M. Jayaprakash  V. Gopal  K. Anandasabari  R. Kalaivanan  S. B. Sujitha  M. P. Jonathan 《Environmental Earth Sciences》2016,75(19):1303

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Depositional facies and ichnology of a tidally influenced coastal plain deposit: the Ogwashi Formation,Niger Delta Basin     

O. C. Ekwenye  G. Nichols 《Arabian Journal of Geosciences》2016,9(18):700

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