Spatial‐temporal patterns of snow cover in western Canada

Snow cover is often measured as snow‐water equivalent (SWE), which refers to the amount of water stored in a snow pack that would be available upon melting. Snow cover and SWE represent a source of local snow‐melt release, and are sensitive to regional and global atmospheric circulation, and changes in climate. Monitoring SWE using satellite‐based passive microwave radiometry has provided nearly three decades of continuous data for North America. The availability of spatially and temporally extensive SWE data enables a better understanding of the nature of space‐time trends in snow cover, changes in these trends and linking these trends to underlying landscape and terrain characteristics. To address these interests, we quantify the spatial pattern of SWE by applying a local measure of spatial autocorrelation to 25 years of mean February SWE derived from passive microwave retrievals. Using a method for characterizing the temporal trends in the spatial pattern of SWE, temporal trends and variability in spatial autocorrelation are quantified. Results indicate that within the Canadian Prairies, extreme values of SWE are becoming more spatially coherent, with potential impacts on water availability, and hazards such as flooding. These results also highlight the need for Canadian ecological management units that consider winter conditions.     

Assessing the geotechnical component of road construction suitability across Australia

Given Australia's dispersed population distribution the construction and maintenance of transportation infrastructure is both essential and expensive. This paper presents a simple model for assessing geotechnical suitability for road construction across the continent, based upon the three major phases of road construction: earthworks, pavement construction and sealing. Data from the recently completed geotechnical landscape map of Australia have been used to operationalise the model at a national scale. The map was coded to the basic spatial units (modified local government areas) of the Australian Resources Information System, so forming an extensive geographic data base suited to a variety of national transport suitability assessments. As a demonstration, the road construction suitability model and the geotechnical data have been applied to the task of mapping the average suitability of each basic spatal unit in Australia for each of the three phases of road construction. The resulting maps provide a comprehensive overview of the instrinsic difficulty of providing roading throughout Australia.     

Estimates of Historical Tree Densities in the North Lachlan River Catchment,New South Wales,Australia

Vegetation structure and composition during the pre‐ and early‐European period in Australia is often proposed as a benchmark against which to measure the effects of modern landscape management practices. However, little quantifiable information exists for that historical period. One potential source of information is the land survey record, used in this study to provide estimates of tree densities that existed during the period 1870 to 1900 in part of central New South Wales. Estimates were obtained for 23 parishes in the north Lachlan River valley, between the towns of Condobolin and Tottenham. Densities were calculated from portion corner to nearest tree data obtained from historical survey plans, using the plotless, closest individual method. Densities ranged from 6.0 to 31.4 trees per hectare for parishes with enough data points for reliable calculation. These figures would account for trees of a diameter large enough to be blazed with a survey mark. Any smaller trees would be additional and, although no quantitative data existed for this, qualitative evidence suggested that the figures obtained were more likely to be underestimates due to the presence of such small trees. The study area was predominantly covered by woodlands which varied in density across the landscape, in comparison to the modern landscape where much of the native vegetation has been cleared for agriculture. Although the tree density figures should be considered to be indicative rather than precise, they provide quantifiable historical figures for past conditions in an area where the historical record is otherwise sparse. Such information is valuable for interpreting ecological changes brought about by modern land management.     

Transient groundwater impacts on the development of paleoclimatic lake records in semi-arid environments

Lacustrine sedimentary deposits are a primary archive of terrestrial paleoclimatic information, and groundwater fluxes under arid climates can dominate water budgets in lake and playa environments. In this paper, we investigate the effects of basin‐scale water table fluctuations on lacustrine paleoclimatic records in arid regions using the hydrogeologic model MWT3D. Boundary conditions for paleo‐recharge over the past 57 ka, land surface topography, the location of lakes, and subsurface geology were based on information available for a 600‐km cross section across the western Murray Basin, Australia. Results indicate the importance of the physical interaction between the water table and the land surface in controlling the location and the timing of formation of paleoclimatic lacustrine records. Lakes in different positions across the watershed preserved different records of climate (wet versus dry), although the same recharge history was applied. Changes in groundwater seepage to the surface lagged behind the climatic signal between 500 and 220 years across the basin. The size of the flow system, specifically the distance from the local discharge point to the adjacent groundwater divide, was the primary control on the time lag. With large fluctuations in water table elevation (>50 m) this distance changes considerably from wet to dry climatic conditions. Our results are largely consistent with observed paleoclimatic records derived from lakes across the Murray Basin.     

The Sound of Silence: Valuing Acoustics in Heritage Conservation

This paper explores the reasons behind the omission of historic acoustic values from heritage assessments in Australia. Best practice dictates that all cultural heritage values associated with significant places should be assessed in order to make informed conservation and management decisions. However, the multi‐sensory nature of aesthetics has been reframed in guidance documentation in ways that run counter to the primary frame. Conventions that have developed around the way places are assessed also work against comprehensive identification of values. As a result, the consideration of aesthetics in cultural heritage is limited to contemporary visual qualities. Furthermore, because the assessment of historic value takes a diachronic rather than synchronic approach, we have little knowledge of the places past communities valued for the sounds they experienced there. Research into landscape preference and acoustic ecology highlights the importance of identifying the inherent acoustic dimension of places and the role sound plays in developing a sense of place. Two landscape areas in Western Australia's south‐west with historic acoustic values, the Boranup Sand Patch and the Lower Reaches of the Blackwood River, illustrate how historic soundscapes can provide insightful contrasts and resonances with contemporary values, and how vulnerable such places are when the sound of place is overlooked in land management policies.     

Fluvial Geomorphology and River Management

Australian river landscapes offer many challenges for management. Much Australian river research is novel, but practical concerns have always had an influence on the research agenda. Australia’s distinctive contributions to fluvial geomorphology include recognition of the great age of many fluvially eroded landscapes; understanding complex levee, terrace and valley fill sequences; analysing the impacts of rare major floods; interpreting the effects of impoundment, mining and urbanisation; and understanding the great anastomosing inland river systems. River restoration is now a major theme in the literature of river engineering, fluvial geomorphology and landscape design. Great achievements are occurring in geo‐ecological river management and engineering. Changing people’s thinking is becoming at least as important as gaining new scientific knowledge. The existing understanding needs to be more widely shared and enhanced by greater involvement with Asian countries where river management issues daily affect the lives of millions of people.     

Empirical Zoning Distributions for Small Area Data

It is well established that using data summaries for a set of geographic areas or zones to estimate the parameters of a statistical model, commonly called ecological inference, frequently leads to the modifiable area unit problem (MAUP). In this article, the zoning effect of the MAUP is investigated for a range of scales. A zoning distribution is defined, and then used to characterize the zoning effect for parameter estimates from ecological analyses. Zone‐independent parameter estimates are obtained using the mean of the zoning distribution, and assessed using the variance of the zoning distribution. Zoning distributions are illustrated for parameter estimates from two ecological regression models at multiple scales using Australian National Health Survey data. For both a continuous response variable and a binary response variable, the empirical zoning distributions are unimodal, relatively symmetrical with appreciable variation, even when based on a large number of zones. The “ecological mean,” or expected value of the empirical zoning distribution at each scale, displays systematic variation with scale and the zoning distribution variance also depends on scale. The results demonstrate that the zoning effect should not be ignored, and the sensitivity of ecological analysis results to the analysis zones should be assessed.     

THE LOCATION THEORY OF THE PLANTATION*

ABSTRACT This paper develops a method for studying noninfinitesimal operational units, with the Thünen location and land use model. With constant returns to scale and perfect divisibility of nonland inputs, all operational units would occupy only a point on the landscape. The present model uses increasing returns to scale to generate large operational units, called “plantations” and studies the comparative statics. The setting of the model is an agricultural operation in which some processing of raw crop must be conducted prior to shipment to market. The processing is assumed to have increasing returns to scale.     

A Nested Approach to Survey in the Egiin Gol Valley,Mongolia

Abstract

Defining an appropriate and adequate survey area is usually the first and most difficult step in survey research design. This paper presents an example from the Egiin Gol Survey project in which current models for nomadic polity development were evaluated against spatial data collected from a valley in north central Mongolia. The survey presented methodological challenges since no prior systematic survey had been conducted in Mongolia and the mobility of steppe groups likely produced significant variation in social scales across the region in question. To address these factors, we did not select a pre-defined survey area with a fixed boundary. Instead, we expanded our regional perspective by creating zones of different survey resolution and applying knowledge of site location from higher resolution surveys to areas still unstudied. Through this nested resolution method, we acquired data at progressively lower cost, enlarged our survey coverage dramatically, and accounted for shifts in socio-spatial scales relevant to our research problem.     

Obscure oases: natural,cultural and historical geography of western Queensland's Tertiary sandstone springs

The distribution of surface water dictates human and animal activity in arid zones. Although typically small, hidden, and inaccessible, springs and wells fed by local aquifers were the only sources of reliable water across vast areas of inland Australia until the last century. Compared to larger, more accessible water sources such as riverine waterholes and Great Artesian Basin discharge springs, their history is sketchy and poorly documented, although rich in intrigue and mythology. Since the expansion of artificial waters and motorised transport, many of these small oases have been forgotten, and their location and permanence are now less well‐known than for thousands of years. We examine the distribution, hydrogeology, cultural history, and biological values of Tertiary sandstone springs in western Queensland based on a review of historical literature, interviews with long‐term residents, and extensive field surveys. One hundred and sixty springs were documented, and nearly 40% of these have declined in flow or become inactive since pastoral settlement for reasons that are not well understood. While their decline in some areas seems related to shallow bores sunk into their local aquifers, it is possible that some smaller springs owed their existence to regular human maintenance. Others are probably naturally dynamic over decadal time scales. This study documents an almost‐forgotten aspect of Queensland's natural and cultural history.     

Making heritage in an Australian coastal tourist resort: Constructing a cultural landscape through a comparative narrative

Abstract

The concept of cultural landscape embodies a dynamic understanding of history, in which past, present and future are seamlessly connected. This paper, drawn from a larger research project investigating the integration of tourism in small coastal settlements, introduces a multi‐method research strategy for interpreting cultural landscapes of tourism. The case study of a well‐known resort area on the east coast of Australia demonstrates the dynamic relationship between patterns in the landscape narrative and patterns in the built environment of small coastal settlements. In Noosa, a distinctive built form has evolved in parallel with the narrative of the place as a relaxed but stylish resort village dominated by nature. Both the narrative and physical landscape have been shaped by local and external processes of constant comparison and contrast with well known Australian and international coastal resorts. The paper illustrates how recurring themes in the local dialogue of place have flowed between key urban design/planning decisions, ephemeral tourism literature, publications, and the perceptions of residents, tourists and key informants as reported in focused conversational interviews.     

Legislating nature for biodiversity offsets in New South Wales,Australia

In the contemporary environmental management landscape, legislation is a principal means through which sustainable outcomes are negotiated. Yet the relations between legislation (as a social practice), nature and justice have been subjected to limited scrutiny. This paper explores these relations through consideration of a system of biodiversity offsets currently being implemented in New South Wales, Australia, following the enactment of the Threatened Species Conservation Amendment (Biodiversity Banking) Act 2006 (NSW). In this paper we investigate the work this legislation does in enacting the materiality of nature in order to explore the interrelations of materiality, law and concerns for environmental and ecological justice. We argue that the act of ‘legislating nature’ is simultaneously a ‘mode of matter-ing’ (Law 2004) that in the case of biodiversity banking (BioBanking), resituates biodiversity within new meanings, spatialities, human–nature relations, and which accounts for biodiversity at a state, rather than local, scale. Utilising the work of Latour, we examine the processes of ‘translation’ required to generate abstracted ‘biodiversity values’ that can be traded and moved between locations. Examination of these processes leads to a consideration of the broad requirements of environmental and ecological justice as a theoretical and political response to BioBanking.     

Local Media and Experts: Sources of Environmental Policy Initiation?

Research on the process of policy change often involves a direct or indirect analysis of the roles of policy entrepreneurs and the mass media. In Colorado, beginning in 1998, twelve communities decided to obtain water rights for recreational in-channel purposes such as kayaking and whitewater rafting. These water rights stirred political controversy within some communities in Colorado related to spending public money, appropriate uses of water, and the role of recreation in local economies. Using a comparative case study research method, this research analyzes the role that policy entrepreneurs and local media coverage of recreational water rights played in initiating policy change in local communities. The most critical finding from this study is that in communities where citizens acted as policy entrepreneurs there was more controversy, less positive media coverage, and more media coverage early in the process. This case contradicts the assumption that local media coverage helps to highlight policy problems within communities. It supports the idea that experts wield higher levels of influence than citizens in promoting policy agendas.     

‘Are we wasting our time?’: bushfire practitioners and flammable futures in northern Australia

Humans are ‘fire creatures’ that have used fire for millennia to shape local environments to diverse purposes. Our capacity for combustion has also forced global climatic changes and rendered the planet increasingly flammable, creating the conditions for progressively higher impact bushfires now and into the future. Meanwhile, governments in fire-prone countries such as Australia have continued to allow settlements to be established (and re-established) in wildland–urban interfaces. Like other ‘natural hazards’, bushfire is thereby a social phenomenon bound up with human values, practices and decisions. But, while studies of the social dimensions of ‘natural hazards’ are steadily rising, this scholarship has rarely addressed natural hazard management practitioners directly, precisely those authorised and entrusted to intervene in the distribution of hazard probabilities and consequences. This paper seeks to help remediate this research gap, illustrating how cultural, ecological, economic and political factors thoroughly condition hazard management and modes of intervention. Drawing on a case study in the Northern Territory’s Greater Darwin region, this paper suggests not only that examining such sociocultural realities provides new insights into hazards and their distribution, but also that attention to such issues is crucial to understanding our flammable future in the Anthropocene.     

The Amenity Complex: Towards a Framework for Analysing and Predicting the Emergence of a Multifunctional Countryside in Australia

There is growing consensus among academics, regional development organisations and rural communities that the future growth and development of rural regions is increasingly dependent upon their ability to convey, to both established and prospective residents, the ‘amenity’ of their local physical, social and economic environments. However, little research to date has sought to identify exactly what comprises ‘amenity’ in the rural context, or has examined how this conceptually slippery quality is distributed across rural Australia, or how it influences local demographic, socio‐economic and land use change. This paper attempts a broad scale investigation of rural amenity in the south‐east Australian ecumene, identifying its core components in this context, mapping its distribution and assessing the nature of its influence over in‐migration rates over the past three decades. The paper finds that, at a macro‐scale, amenity tends to follow a general gradient from high to low according to distance from the coast, and that its relationship with in‐migration rates has increased substantially between 1976–1981 and 1996–2001.     

Surveying for Mars Analogue Research Sites in the Central Australian Deserts

In anticipation of a future crewed mission to Mars, the international non‐profit organisation known as the Mars Society is currently establishing four mockup bases at which planetary surface operations simulations, equipment testing and personnel training exercises will be conducted over the next decade. These should provide valuable design data for, and raise public awareness about, plans to explore the red planet. One of these bases, which are organised around a habitat of the kind that is likely to serve as shelter for surface‐dwelling astronauts, is to be sited in central Australia under the name MARS‐OZ. To find a suitable location, the Mars Society Australia has conducted a ground‐truth survey of 15 potential sites as practical scientific analogues of the Martian surface, recording these in a specialised database. Each site was assessed on a set of geomorphic, science/engineering, logistic and visual analogue criteria. Six circular exploration zones 200 km in diameter were identified as clusters of the most significant, observed, comparative planetological features. These zones were then ranked to recommend a series of ‘landing sites’, at which future field seasons of exploratory science may be conducted.     

Reserve Selection for Nature Conservation in South Australia: Past,Present and Future

This paper re‐examines the chronology of reserve selection in South Australia in the context of changing social, political and economic attitudes. The effect of these changing attitudes on reserve selection in South Australia is assessed in the light of the principles of a comprehensive, adequate and representative (CAR) National Reserve System. The outcome of reserve selection in South Australia is the establishment of a vast network of reserves in the arid regions and many fragmented and small reserves in the agricultural regions. It is likely that the remnant ecological system in the agricultural regions is not representative of the regional environmental diversity and that land clearance has precluded the establishment of a CAR reserve system in South Australia. The rate of reserve selection for nature conservation has decreased over the past decade as the opportunities for reserve acquisition decrease. It is concluded that large‐scale and strategic revegetation will be required to facilitate a CAR reserve system in South Australia.     

Insect and clitellate annelid traces in mesofossil assemblages from the Cretaceous of Australasia

Mesofossil assemblages from several Cretaceous and Cenozoic units across Australia and New Zealand provide new evidence of insect and annelid behaviour. The earliest scale insects (Diaspididae, Coccoidea) from Australasia are described and represented by three scale morphotypes. The mesofossil assemblages also reveal clitellate annelid cocoon morphotypes, three morphotypes of arthropod coprolites and several insect piercement structures on gymnosperm leaf or stem fragments, possibly related to feeding or more likely oviposition. This research offers a new avenue for detecting cryptic terrestrial invertebrate groups and their interactions, particularly with plants, in the fossil record. The fossils demonstrate that insect/invertebrate activity can be preserved and identified in mesofossil suites, that such traces and exoskeleton fragments are relatively common in acid-extracted mesofossil suites, and that recognizable categories occur on multiple landmasses and at various ages.     

Potential Use of Radiometric Data for Wildlife Habitat Modelling

The potential use of existing radiometric data sets, previously collected for prospecting purposes, has very rarely been used as a variable predictor in wildlife habitat modelling. The utility of radiometric data for predicting vegetation community patterns and wildlife habitat was investigated in the Australian arid zone using the Burt Plain bioregion as a case study. Using spatial datasets and a Species Distribution Modelling Toolkit, arid zone vertebrate species were modelled with Generalised Linear Modelling (GLM) regression modelling techniques. These models were used to predict the probability of occurrence of a species at any given location, defined in terms of its environmental attributes. A statistical correlation between the radioactive elements uranium, thorium and potassium, and terrain aspect was found. No statistical correlations were established between the radioactive elements and vegetation patterns; although we suspect these exist at finer scales of mapping. Radiometric data were identified as explanatory variables in the habitat models of all of the 32 vertebrate species examined, and used as illustration in the development of probabilistic spatial predictions of three species (Red Kangaroo, Macropus rufus; Lesser Hairy‐footed Dunnart, Sminthopsis youngsoni; and Rabbit, Oryctolagus cuniculus) in the bioregion. Our analyses suggest that radiometric data sets involving the radioactive elements: (uranium, thorium, and potassium), and vegetation could be used as predictors of biodiversity patterns at the bioregional and landscape level. This is an important finding given the challenges posed in undertaking broad‐scale biological surveys in the arid zone of Australia.     

Spatial Variability of Controls on Downstream Patterns of Sediment Storage: a Case Study in the Lane Cove Catchment,New South Wales,Australia

This study uses GIS techniques to examine the spatial distribution of stream power along major streamlines in the Lane Cove catchment in northern Sydney, Australia. Channel gradient estimates derived from a 5 m resolution digital elevation model (DEM) are combined with streamflow data to estimate stream power along river courses. Stream power and its constituent components are then related to a detailed field‐based assessment of sediment storage along the trunk stream and primary tributaries. At the catchment scale, sediment storage per unit length decreases as channel gradient and gross stream power increase. However, local controls such as variability in valley width and occurrence of confluence zones exert a greater influence upon sediment storage, disrupting systematic catchment‐wide relationships. The total volume of storage along each streamline has a strong linear relationship to the area of the subcatchment, but the distribution of sediment along streamlines varies between subcatchments. The GIS framework employed in this project allows generation of continuous, empirical data, thereby providing catchment‐specific predictive capacity that can accompany theoretical approaches to stream power modelling.