Infrastructure Engineering - Research Publications
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ItemThe behavior of stratified pools in the Wimmera River, Australia(AMER GEOPHYSICAL UNION, 1996-10)Numerous inland Australian streams contain density‐stratified or saline pools, which are usually located on channel bends. Saline pools consist of a layer of saline water underlying a layer of fresh water. Saline pools generally form as a result of saline groundwater seeping into the stream and collecting in scour depressions during periods of low flow. Inflows of saline river water can also collect in scour depressions. Field and laboratory investigations of saline pool mixing by overflowing fresh water reveal that mixing depends on a balance between interfacial shear and buoyancy forces acting on a thin dense layer flowing up the downstream slope of the scour depression, and on the bend sharpness. Convection associated with surface cooling also causes mixing. A model for saline pools formed by groundwater inflows and mixed by fresh overflows is proposed and applied to several saline pools in the Wimmera River.
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ItemPreferred states in spatial soil moisture patterns: Local and nonlocal controls(AMER GEOPHYSICAL UNION, 1997-12)In this paper we develop a conceptual and observational case in which soil water patterns in temperate regions of Australia switch between two preferred states. The wet state is dominated by lateral water movement through both surface and subsurface paths, with catchment terrain leading to organization of wet areas along drainage lines. We denote this as nonlocal control. The dry state is dominated by vertical fluxes, with soil properties and only local terrain (areas of high convergence) influencing spatial patterns. We denote this as local control. The switch is described in terms of the dominance of lateral over vertical water fluxes and vice versa. When evapotranspiration exceeds rainfall, the soil dries to the point where hydraulic conductivity is low and any rainfall that occurs essentially wets up the soil uniformly and is evapotranspired before any significant lateral redistribution takes place. As evapotranspiration decreases and/or rainfall increases, areas of high local convergence become wet, and runoff that is generated moves downslope, rapidly wetting up the drainage lines. In the wet to dry transitional period a rapid increase in potential evapotranspiration (and possibly a decrease in rainfall) causes drying of the soil and “shutting down” of lateral flow. Vertical fluxes dominate and the “dry” pattern is established. Three data sets from two catchments are presented to support the notion of preferred states in soil moisture, and the results of a modeling exercise on catchments from a range of climatic conditions illustrate that the conclusions from the field studies may apply to other areas. The implications for hydrological modeling are discussed in relation to methods for establishing antecedent moisture conditions for event models, for distribution models, and for spatially distributing bulk estimates of catchment soil moisture using indices.
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Item[Review of the book Fermat's last theorem](The Victorian Bar, 1997)Two recent books celebrate the long sought solution of a venerable maths problem.
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Item[Review of the books Skunk works: a personal memoir of my years at Lockheed and The story of Webster's Third: Philip Gove's controversial dictionary and its critics](The Victorian Bar, 1995)Description of two creative men and their work products – innovative top secret US military aircraft and the current edition of Webster’s Third New International Dictionary.
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ItemImplementing LIS/GIS from a customary land tenure perspective: the Fiji experience( 1995)This paper briefly reviews Fiji's national land information system (LIS) strategy and the major land and geographic information systems (LIS/GIS) initiatives that have been under way in the major government organisations in Fiji up to April 1994. It also describes and attempts to examine the impact that these initiatives have had on the people who continue to live under Fiji's customary land tenure systems.
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ItemImplications of incorporating Customary Land Tenure Data into a Land Information System( 1995)Land Information Systems (LIS) have been primarily developed to serve the needs of countries that use a 'western' style land market where individual land rights are the norm. However many countries that have a large proportion of lands held under customary land tenures where communally held land rights are common, are also wishing to establish LIS. For these countries LIS is a tool to facilitate the management and administration of their land resources, preserve their customs and traditions and promote the development of a market economy. In order to be effective, the LIS introduced into these countries will need to incorporate customary land tenure data. This paper considers the implications of incorporating such customary land tenure data into a LIS.Firstly the attributes of western land tenures that are currently used in Land Information Systems are reviewed; then drawing examples from Fiji, the paper examines some of the attributes of customary tenure that could be entered into a LIS. This is followed by a discussion of some of the major issues associated with including customary tenure data into a LIS.
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ItemTraditional land tenure issues for LIS in Fiji( 1995)With the help of the New Zealand Government, a national LIS is currently being implemented in Fiji, under the auspices of the Department of Lands. Like many other Pacific Island countries, Fiji has a complex land tenure system. This is the first of two papers that aims at examining the implications of LIS for traditional land tenures. Since LIS is a product of the industrialised world, attributes of the conventional `western' land tenures can easily be incorporated into any LIS. However, attributes of traditional land tenures are yet to be identified and incorporated into an LIS. Unless traditional land tenure issues are considered and taken into account when implementing an LIS, the LIS will not be fully accepted and utilised by the traditional peoples, and will therefore not be truly successful. The emphasis in these papers therefore will be on the traditional aspects of land tenure. This paper reviews Fiji's dual land tenure systems, with particular emphasis on it's traditional land tenure system, and raises some issues and problems of it for an LIS.
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ItemAppropriate cadastral systems( 1995)This paper discusses the role of cadastres in developing countries, reviews why cadastral systems have become much more important in the eyes of policy makers over the last ten years, particularly in the developing world, and finally highlights some important lessons arising from establishing cadastral systems in developing countries over the past decade.
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ItemEstablishing coordinated cadastres: Australian experiences( 1996)Australian cadastral systems have been strongly influenced by the historical settlement of the Australian states and territories. An important consequence is that no cadastral office was ever established and as a result a coordinated cadastre never developed. Departments of Lands or Surveyors General departments administered the ever decreasing Crown lands as a result of rapid alienation, as well as the jurisdictions' surveying and mapping infrastructure. As a result Australia lacked a European style cadastral office providing a complete cadastral record which could be used for land administration purposes. Land Titles Offices historically had the responsibility for all freehold or private lands, which now comprise the vast majority of land parcels in the states. These Offices have been responsible for examining all cadastral surveys and ensuring appropriate regulations for such surveys, however they have only ever been concerned with individual transactions in support of an efficient land market. The maintenance of the cadastral map for each jurisdiction however has usually remained under the control of the Surveyor General or in recent years a geographic information coordination agency. Increasingly the title register in each jurisdiction is including all Crown and government lands and is assuming the role of a European cadastre, albeit the cadastral index has legal significance since it is based on actual land titles. Due to computerisation of the titles register and the establishment of digital cadastral data bases (DCDB), the trend in Australia is for the textual and spatial components of the cadastre to come together technically and administratively. This has allowed Australian jurisdictions for the first time to have a complete cadastral record to support land administration. The resulting model has permitted Australia to move from a land administration structure that was conceptually well behind that of most developed and many developing countries to a position at the forefront of developments due to innovation and computerisation. The development of coordinated cadastres formed by upgrading the now complete DCDBs in Australia is the key in the future improvement of Australia's cadastral systems. This paper reviews this development and shows how the Australian systems differ from their European counterparts. It concludes by attempting to describe a future conceptual model for an Australian state wide geographic information system based on a legal cadastre. Australian states and territories are well advanced to achieving this vision.
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ItemA land information vision for Victoria( 1996)Objective: To develop a vision and milestones to achieve the vision, for the use and management of land parcel related spatial data (here after termed land information) in Victoria in ten years. While the primary focus of the vision is on land parcel data, the vision recognises that to be useful and effective, land parcel data needs to be integrated with or utilise other appropriate components of the State's digital map base (SDMB), and particularly the topographic data. This vision must complement the other visions being prepared by the Victorian Government as part of the development of a holistic vision for the management of spatial information in Victoria. The other visions include: • Environment and Heritage • Industry Development • Socio-Economic Planning • Intermodal Transport • Emergency Response