School of Geography - Theses
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ItemEnvironmental policy and orthodox economics: a case study of Victorian solid waste( 2007)In this thesis I use the idea of 'rational ideologies' to investigate the value and role of orthodox economics in solid waste policy in Victoria, and its relationship with a dominant set of policy ideas that I call industrial ecology. I show that many orthodox economists criticise industrial ecology and prescribe alternative policies based principally on market-based instruments (MBIs) and cost-benefit analysis (CBA) with environmental valuation. They largely ignore the economic underpinnings of industrial ecology. I report on four empirical research projects. Firstly, I investigate the influence of unit-based pricing of domestic garbage in Melbourne on garbage quantities. I find its effects trivial except where rates were set at levels higher than orthodox economic theory would suggest is appropriate. Home owners have reduced garbage for non-economic reasons. Secondly, I compare 37 cost-benefit studies of recycling, revealing enormously varied approaches and results that are often apparently infused by analyst ideology or sponsor interests. Rather than the hard rationality it seems to promise, CBA with environmental externality valuation diverts debate into complexities that are the preserve of experts. The ideological foundations of some orthodox economic interpretations of environmental issues are shown to be weakly supported by theory or logic. Thirdly, I review the history of Victorian solid waste policy since 1970. As an early pollution crisis was overcome, the agenda shifted to waste minimisation. Regulation, corporatist agreements, targets and strategies have helped to level off the quantity of waste to landfill and grow post-consumption recycling into a major industrial operation. Costs have risen substantially but public support remains strong. Industry, local government and environment groups have competed for influence in the policy arena. While waste management has been transformed into a competitive market structure, orthodox economics has played only a small role in the policy history. Where CBAs have not be desultory they have failed to resolve policy disputes. Use of MBIs has been beset by administrative and sunk-cost concerns. Finally, I report on a survey of 46 members of the solid waste policy community on the economics of solid waste. There is a surprisingly high degree of in-principle acceptance of orthodox economics conceptions of the environment, such as CBA, environmental valuation and MBIs. There is more disagreement over resource efficiency,, recycling targets and interpretation of the value of economic tools in practice. Variation in views is linked with professional grouping more than economics education. There is strong support for the economic underpinnings of industrial ecology. I suggest that environmentalists' simultaneous acceptance of orthodox economists' intellectual framework yet rejection of their prescriptions demonstrates the practical weakness of that framework but also represents a latent danger to environmentalism. In concluding, I interpret orthodox economics as a rational ideology that is blind to its ideological content. I argue that this blindness has led to overconfidence, inflexibility and overambition, and that these characteristics have marginalised orthodox economics in Victorian solid waste policy. I argue for analytical plurality and the supremacy of political judgement.
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ItemThe resistance of herbaceous vegetation to erosion: implications for stream form( 2006)Vegetation growing on the banks of a stream channel influences geomorphological processes operating in that channel. A large body of research has investigated the role of vegetation in controlling the erosion of stream channels, but the majority of this research has considered riparian trees and other woody vegetation. Consequently, our understanding of the influence of herbaceous vegetation on channel erosion is limited. The overall aim of this thesis was to address this knowledge gap by establishing the resistance to erosion of herbaceous vegetation in terms of shear stress and the length of time (duration) of exposure to shear stress, then comparing it to the shear stress and duration of exposure that occur in a number of streams in Victoria, Australia. The study focuses on the influence of herbaceous vegetation on the fluvial entrainment of sediment from horizontal surfaces. Horizontal surfaces are a particular subset of geomorphological features that occur in alluvial streams that include bars and benches. The erosion resistance of herbaceous vegetation directly sampled from horizontal surfaces in streams was estimated using a custom-built laboratory flume that generated very high bed shear stresses. The influence of stem length and substrate size on erosion resistance was tested in the flume study: mature herbaceous vegetation with long stems withstood high levels of shear stress for several days of continuous exposure. Erosion resistance was found to be inversely related to substrate size and positively related to stem length. The maximum erosion resistance of herbaceous vegetation in the flume study was greater than values reported in the literature for herbaceous vegetation growing in artificial drainage channels and on hillslopes. The shear stress exerted in stream channels is often estimated using methods based on cross-sectional average hydraulic conditions. Comparison of cross-sectional mean shear stress and the local shear stress exerted on horizontal surfaces estimated at six study sites in Victoria using high-resolution two-dimensional hydraulic modelling indicated that the erosion of horizontal surfaces is unlikely to be accurately predicted by mean shear stress. It is also possible that mean shear stress will not accurately predict the erosion of other sub-cross-section-scale geomorphological features. The frequency of erosion of horizontal surfaces covered with herbaceous vegetation was estimated at the study sites using erosion prediction analyses that combined the erosion resistance data from the flume study, estimates of local shear stress and exposure duration of horizontal surfaces at the study sites. The exposure duration was estimated by analysing the long-term sub-daily discharge records. The erosion prediction analyses indicated that mature herbaceous vegetation had sufficient resistance to erosion to withstand the shear stress and exposure duration at all study sites, and consequently would not be eroded. Immature herbaceous vegetation, however, would be eroded at all study sites; the frequency of erosion varied and was dependent on the stem length. The erosion prediction analysis method was applied to investigate the variation in the effectiveness of herbaceous vegetation in stabilising horizontal surfaces at the catchment-scale. Although the results were not conclusive, it appears that the influence of herbaceous vegetation is greatest in the upper catchment, which contrasts with previous research that identified a mid-catchment peak in fluvial entrainment of bank material. The duration of exposure to inundation is likely to be the main driver of herbaceous vegetation degradation in the lower catchment, as hydrograph attenuation leads to long duration events that cause oxygen deprivation stress on the herbaceous vegetation. A number of conceptual models of the temporal variation in erosion resistance of horizontal surfaces for different management scenarios were developed. Further data on the influence of vegetation other than herbaceous vegetation on the erosion resistance of horizontal surface are required, but based on the outcomes of the thesis and previous research it is clear that stream restoration designs that aim to increase channel stability with woody vegetation should be carefully considered. It is possible that rather than stabilising the channel, the impact of the maturing woody vegetation on the herbaceous vegetation understorey will lead to a reduction in overall stability.
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ItemMeasuring rural community sustainability: the use of social indicators in an adaptive approach to catchment management( 2005)An understanding of social issues is imperative for effective planning and policy development to foster sustainability. Social sustainability, or well-being, of communities is integral to any assessment of sustainability since it reflects, and impacts upon, ecological and economic sustainability. One area where this has direct implications is the management of natural resources. The catchment, or watershed, has assumed importance as a planning unit for natural resource management (NRM) in Australia. Integrated catchment management (ICM) has widely been adopted for NRM at the catchment scale but is largely confined to biophysical issues. To combat this bias, social issues need to be represented in a format that can be used to assist decision-making. Such feedback can fulfil a range of purposes. In the case of ICM, insight into social conditions can be used to both inform the social context for decision-making and provide feedback on policy and program outcomes, to enable an adaptive approach to catchment management. This thesis was concerned with the development of a system to monitor trends in the social sustainability of rural communities. Several theoretical areas and a multi-staged empirical investigation informed this thesis. In particular, it is ground in the notions of 'community sustainability' and 'social sustainability' that evolved from the discourse on sustainable development; consideration of methodological frameworks for social indicators; and through a case study. The case study draws upon the needs and concerns held by local stakeholders from multiple communities across the Woady Yaloak catchment in rural Victoria, Australia. Through interviews, personal observation and questionnaires, some insight is offered into the social dimensions of community sustainability in a rural context, and a suite of perceptual social indicators were constructed and applied to validate the tool and measure how stakeholders consider the social condition of their communities. A series of social indicators were developed and validated to represent the components of community sustainability in a manageable format that can be quantified. This provides a comprehensive framework of the issues to consider, a mechanism that can be applied to inform the social context for decision-making and the strengths that can be harnessed or the weaknesses that need to be addressed, for planning or policy evaluation, or for sustainability considerations. It is argued that this system of perceptual social indicators is useful to counter the emphasis on objective measures. This system can be used in conjunction with objective measures to provide a broader picture.
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ItemWhat is the value of a hole in the ground?: What is the value of discrete choice contingent valuation?( 2001)The inability of market price systems to reflect the social value associated with environmental conservation presents a barrier to the achievement of overall allocative efficiency. Stated preference valuation techniques such as the contingent valuation method have been found to be useful in capturing and measuring unexpressed preferences for environmental protection and enhancement. When applied correctly, these techniques can alleviate some of the most intractable market failures, such as those which involve pure public goods. This thesis explores the theoretical validity of different approaches to contingent valuation questioning through a survey of Victorian households' attitudes to the dereliction of open gold mine pits in the Victorian countryside. The methodological research involves comparison of discrete and continuous models of contingent valuation questioning, including a wide scale test of a new approach to discrete questioning, referred to as the "dissonance minimising choice" method, which seeks to correct the upward bias of yea-saying suspected in dichotomous choice studies. The results reveal a notable level of community concern about present mining practices in Victoria and a considerable willingness to pay for minesite rehabilitation. The results for the contingent valuation method indicate that survey respondents made robust and rational utility-maximimsing choices. The discrete-choice results were still significantly higher than the results for open ended study, with the performance of the dissonance mimimising choice method rather mixed in comparison with the traditional dichotomous choice approach. i
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ItemSpatial variation in benthic community structure in upland streams: the influence of fine sediment transport( 2000)Physical factors can play an important role in structuring plant and animal communities. Together with spatial variation in their magnitude, differences in species tolerances to these factors are thought to explain considerable variation in the structure of natural assemblages. This thesis examines spatial variation in fine sediment transport in upland streams, and the effects of this on the structure of benthic invertebrate assemblages in this system. I initially surveyed sediment transport rates (3 times) using box type bedload traps and the faunal assemblages (twice) on individual stones at 12 sites on 3 regulated and 3 unregulated streams in the upper reaches of the Acheron and Yarra catchments, which drain from the Great Dividing Range, southeastern Australia. This study region spans a geologic boundary, and includes areas of acid volcanics in the north, and granite and sandstone to the south. Sediment transport rates, which were measured only at low flow ranged from 5+2 to 821+115 g.day' (mean f 1 SE) at each site. Transport rates between the volcanic and granitic/sandstone catchments accounted for most of the variation between sites, and thus differences in transport rates between the two geologies approached 3 orders of magnitude. The flow diversion weirs on some of the streams were found to negate any differences in sediment transport rates between the two catchment types. Multivariate analysis of macroinvertebrate assemblages clearly distinguished between assemblages from sites in the volcanic and granitic areas. Overlaid on these differences was the effect of flow regulation, in which assemblages at regulated sites in both catchments converged toward one another in terms of overall assemblage structure. The composition of the assemblages at these regulated sites differed from unregulated sites in both catchment types. Notably, although multivariate techniques clearly established the above patterns of difference, commonly measured variables such as species richness, total abundance and the abundance of common taxa showed ambiguous patterns with respect to catchment geology. The multivariate analyses suggest that differences in community structure between granitic and volcanic streams are partly related to the effects of sediment transport. However, I was not able to demonstrate this to be the case. In a field experiment in which sediment transport was excluded across individual patches of the streambed at 6 of the unregulated study sites, no changes were observed in the fauna colonising these patches relative to controls in which sediment transport was maintained at natural levels. This was so in both the volcanic and granite catchments. Nevertheless, multivariate analyses again showed assemblages within the granite and volcanic catchments to differ in a similar fashion as observed in the original survey. In a set of artificial stream channels located adjacent to one of the study streams, changes in the benthic community were monitored in response to short-term and long-term sediment addition. These two experiments considered changes in sediment loads that might occur, in the short term as a result of small spates (a pulse disturbance), and in the long-term as a result of natural variation in sediment loads, or alternatively as a result of human impacts (a press disturbance). In both cases sediment addition caused only minor, but consistent changes in the benthic assemblage. In the case of disturbance caused by spates, it appears that changes in flow are the predominant mechanism disturbing the community during these events. Overall, these communities appear to be resistant to the effects of sediment transport. Presumably this resistance relies on the maintenance of suitable habitat, and thus sedimentation of rocky substrates would probably cause far greater changes than were detected here in response to sediment transport. It is possible that in the granite streams surveyed, the effects of sediment transport are to some degree mediated by the ability of animals to find refuge from sediment induced abrasion, perhaps by seeking shelter on the lee side of rocks, or in dead water zones where scour by sediment transport is minimised. Future research must concentrate on the physiological tolerance to sediment transport of these organisms, and whether behavioural adaptations allow stress to be minimised in heterogeneous stream reaches.
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ItemThe geographical dimensions of social banditry: the Kelly outbreak 1878 -1880( 1977)Bushranging was an integral part of nineteenth century- rural settlement in Australia and the bushranger earned a favoured place in the nation's folklore. There he has remained Academic studies of the bushranger and bushranging outbreaks have been few in number and limited in scope to biographical studies, divorcing the bushranger from his times. An academic tradition exists that treats the bushranger as a social aberration. Many, in fact, were social bandits, similar to those in southern Europe as identified and described by Hobsbawm. The bushranger often represented an extreme reaction to social conditions. His views were more extreme than but still compatible with social attitudes and mores developed in rural areas during the conflict that accompanied political ' attempts to foster agricultural settlement in nineteenth century Australia. This thesis examines the Kelly Outbreak of 1878-1880 in North-Eastern Victoria, sets the Outbreak in the context of its time and examines the inter-relationship between settlement failure and social banditry. Three successive rural land-use systems dominated the North-East between 1835 and 1884. The pastoralists (squatters) were the first settlers establishing huge runs for sheep. Gold discoveries of 1852 disrupted squatting land-use and mining dominated the region " for a decade. Declining yields and political ferment brought the first of the selection acts in I860. The digger was expected to turn to agriculture for his. livelihood. The acts pitted the selector and squatter against each other in a competition for the control and utilisation of the region's rural resources. The squatters' easy victory compounded the problems already posed by the failure of selection as a commercial agrarian enterprise. Selector communities developed a code of ethics that accepted selective stock theft. The four members of the Kelly Gang came from local selector communities in the North-East. All had served jail sentences for stock theft or crimes related to stock theft. The Kelly brothers belonged to a clan whose members had failed as selectors and who were notorious to the police and local squatters as stock thieves. The Kelly's had much in common with their selector neighbours and although their views were more extreme, they were never alien to those who lived in the same communities. In 1878, when four young selectors' sons formed the Kelly Gang after the tragedy at Stringybark Creek, they found widespread local support amongst selector communities in the region, a support that enabled them to elude the police for over I8 months. Without the failure of selection as an agrarian settlement process, a failure rooted in the conflict for the control of rural resources by two socially antagonistic groups, and the development of attitudes in rural areas favourable to the existence of social banditry, the Kelly Outbreak would not have posed the serious challenge to the Victorian authorities that it came to be. And the existence of social banditry in the capitalistic social structure of nineteenth century colonial Victoria suggests that the preconditions and social situation described by Hobsbawm as being necessary for the development of social banditry should be modified.
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ItemUrban road traffic noise and health( 2000)Some people say they are annoyed by traffic noise. There is rather a lot of evidence to show that where traffic noise is louder, more people say they are annoyed by it. On the basis of this sort of evidence, there is a consensus that road traffic noise causes annoyance. Traffic noise is also suspected of being dangerous to health: of making people ill; so ill they reach for painkillers or even visit a doctor to get medicine prescribed. The fundamental aim of this thesis is to find out whether this is happening in Melbourne. The available evidence contains anomalies: people seem to be healthy where noise is loudest. Even annoyance studies sometimes detect unexplained peaks of annoyance in quieter places; or a plateau of annoyance in high noise. However, the anomalies display a certain consistency. Traffic noise is orthodoxly measured by loudness. Several studies have found a peak of annoyance at around 60 decibels. The consistency of the anomalies suggests that some other physical characteristic of noise may be responsible for the anomalous responses. This thesis sets out to explore the urban soundscape in an attempt to find such a characteristic, and discovers the pattern of alternation of passby noise and background sound: passby patterns. The orthodox loudness measure is essentially a proxy for the daily average sound energy delivered to the ear by traffic. To define patterns requires taking this measure apart - splitting traffic noise into two sounds: the sound of passbys and the background sound. The definition builds up through the use of point source theory, observations in urban and rural environments, experiments with a typical sedan in isolated locations, and experimentation with techniques for the measurement of background sound generated by roads. The tools applied are ears, stopwatch and sound meter. The result is a set of techniques aimed to measure patterns of passby noise in urban environments. Application of these techniques at 102 randomly selected sites spread over 150km2 of urban environments detects passby patterns in Melbourne. By way of an example, the final stage of this investigation embeds pattern measurements within a small, orthodox study of the annoyance and health responses to traffic noise measured by decibels. The results are consistent with regular or rapidly alternating passby patterns being closely associated with annoyance and ill health. In particular, in relation to people who are sensitive to noise, it should no longer be assumed that peak distress at approximately 60dB(A) is anomalous. It may well be due to high levels of patterning of passby noise. The result requires confirmation, to be sure, but the evidence is sufficiently strong to suggest that traffic noise and patterns of passby noise, or something closely associated with them, are probably associated with health problems in Melbourne.
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ItemHolocene sea levels and related environmental changes in Anderson Inlet, Victoria, Australia( 2000)Anderson Inlet in south eastern Australia preserves marine sediments that were deposited facing the Southern Ocean during the Holocene. Data obtained from near surface sediment samples together with topographic data are used to investigate the geomorphology, stratigraphy, Holocene sea level changes and related physical environment in Anderson Inlet, Victoria, Australia. The Holocene strata in the Anderson Inlet area in Victoria can be stratigraphically divided into four units, Unit I, Unit II, Unit HI, and Unit IV. Unit I and Unit IV lack fossils and were deposited in non-marine, probably fluvial, environments. Unit E and Unit IE contain abundant foraminifers with molluscs, ostracods and bryozoans. Foraminiferal analysis suggests that Unit IE was deposited in a partially sheltered marine environment, while the high plankton content and relatively high diversity of benthic species in Unit E indicate that this unit was deposited in an open bay at water depths possibly less than 5 m. The faunal data are integrated with radiocarbon dates to arrive at the following Holocene palaeoenvironmental history in this area: 1. Low alluvial plain stage (10000-7000 yr BP); 2. Open bay environment stage (7000-5500 yr BP); 3. Partially sheltered marine environment stage (5500-4500 yr BP); 4. Alluvial plain and coastal lagoon environment stage (since about 4500 yr BP). Contrary to interpretations made elsewhere in south eastern Australia, evidence exists for multiple higher Holocene sea levels in this area. Evidence for two higher Holocene sea level events with one lower sea level event in between has been identified. The timing of these Holocene sea level fluctuations correlates with the deglaciation history of Antarctica and climatic changes inferred from the geological record of mountain glaciers and fossil plants. The evidence suggests that the Anderson Inlet area has been strongly influenced by cold water regimes from the Southern Ocean during the middle Holocene and that marked environmental changes have occurred in the area during the Holocene, associated with the sea level fluctuations. During the last interglacial when sea level was 6.55 m higher than present, the Anderson Inlet area was an open marine environment consisting of several smaller embayments. The shoreline during this time followed the coastal cliffs and bluffs. During the first higher Holocene sea level stage (ca.7000-6000 yr B.P.), sea level was 1.8 m higher than present, the area was also an open marine embayment. During the second higher Holocene sea level stage (ca.5500-4500 yr B.P.) when sea level was 0.5 m higher than present, a minor sand spit developed which partially restricted the marine * embayment. It is inferred that the higher sea levels are likely to have been eustatic events associated with the deglaciation of Antarctica during the Holocene. The modem barrier system of Anderson Inlet is made up of a complex of sand dunes built up in response to the Holocene sea level fluctuations, especially during regressive events since the middle Holocene. The sand dune system of Anderson Inlet is very similar to other coastal barrier systems in south eastern Australia that have built up during the Holocene.
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ItemAsian migration and changing employment and occupation in Melbourne( 1997)This thesis examines the employment and occupation of South Asian migrants in Melbourne. To this end, census and cross sectional data from the Australian Bureau of Statistics (ABS) and Bureau of Immigration and Population Research (0FR) as well as the survey data collected for this study, are used. In this study special attention is paid to South Asian migrants in terms of their demographic and economic characteristics, occupational adjustment, job quality and process of self-employment. The analysis of South Asian migrants is made according to birthplace, gender and policy category under which they enter into Australia. In examining the South Asian migrants, the study reviews the relevant literature and existing theories and models about their economic success and occupational adjustment overseas and in Australia. In this regard the main factors that influence migrants' occupational adjustment and economic success in the host country have been identified at and applied to the study of South Asian migrants in Melbourne. The study also reviews the Victorian economy in this context. The study describes demographic and economic characteristics, general flow and skill composition of South Asian migrants in Australia. According to the BIPR and survey data, most of the migrants from Bangladesh, India and Sri Lanka are professional and came under the skill migration category. The data also show that South Asian migrants are distinctively different from other non-English speaking background migrants or other Asian migrants in respect of education, professional and occupational backgrounds and skills. The study examines transition and occupational adjustment, quality of jobs and experience of unemployment held by South Asian migrants in the local labour market. The data reveal that the majority of the qualified migrants from Bangladesh, India and Sri Lanka have adjusted well in their own profession through a sequence of jobs. A considerable number have regained either the same or higher status jobs compared to their pre-migration position. Although a considerable number of South Asian migrants have adjusted into occupations similar to their pre-migration occupations, the data show that they in fact status lost. The data also provide evidence that a significant number of migrants have shifted from professional and managerial to non-professional blue collar jobs in the process of their occupational adjustment in Melbourne. The findings reveal that the economic success and occupational adjustment of the migrants in the labour market vary according to birthplace and gender. Although the statistical test indicated that there is no significant difference between the present occupation status and policy category of the migrants, the chi square test indicates that there is some difference between birthplace groups in terms of the distribution of migrants' present occupation and industry. The chi-square test confirmed the significant difference between gender in terms of the distribution of migrants' present occupation. The evidence also shows that a significant number have not been able to enter the labour market since their arrival in Australia and were not able to utilise their professional, technical and academic skills.The study also examines the experiences of self-employed South Asian migrants. Again, the evidence suggests that the majority of these migrants are able to utilise their skills and potentials in their business. However, the case studies indicate that the career advancement of some migrants has been blocked due to this self-employment. The study also analyses the influence of structural change, particularly changes in employment and labour force characteristics, upon the participation of Asian migrants in different industries and occupations. The evidence reveals that South Asian migrants have been affected in terms of their participation according to industry and occupation due to the structural changes occurred in the 10 years to 1996. In conclusion, the study of South Asian migrants discussed relevant theories and models in the light of ABS and survey data. The examination of these data provides evidence that the human capital of migrants plays a significant role in their economic success and occupational adjustment particularly in terms of income and /or employment. In this regard they are able to utilise their skills and potentials in the local labour market. However, the theory of migrants has not paid attention to occupational status which this study identifies as an important indicator for economic success and occupational adjustment of South Asian migrants. The theory of migrants mainly focused on the overall labour market outcomes of the migrants in relation to employment, income differences, participation and unemployment rates.