Architecture, Building and Planning - Theses
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ItemDevelopment of a visual compatability model for suburban landscape : a pilot study in City of Melbourne and its eastern suburbs( 2003)The aim of this research project is to develop a procedure which will lead to the development of a landscape model, applicable to the urban and suburban landscape in Melbourne or other cities. Such a model will enable landuse planners to deal with the intricate problem of conflicts between visual character of a place and the threat of development impacts likely to impinge on the character. The author is interested in identifying and quantifying the visual characters and gauging the public perception of these characters so that a landscape model can be developed. It can be in the form of a set of equations, a list of significant factors in quantitative or descriptive format, a measuring scale of preference scores or a combination of these. The intent is to devise a comprehensive method which would be useful as a tool in assisting landscape planners and designers in decision-making about preserving existing landscape character subject to development pressure or changes. The landscape model may consist of predictive, quantitative, descriptive or perceptual landscape sub-model or some combination of these sub-models. Its role is to provide a yardstick for planners to process development proposal by comparing how the potential impacts would affect the original site with the standard landscape model. Firstly, it is necessary to look at how to identify the landscape character of residential landscape. From literature review and site analysis, five key visual landscape factors contributing to the landscape characters were identified. The factors are Vegetation, Land, Density, Design and View, most of which can be quantified under a set of criteria in any specific residential area. Amongst these factors, Vegetation has been the most popular subject in past literature in landscape assessment studies. There were other landscape studies involving some aspects of the factors of Land and View. However, very little research has explored components of the Density and Design factors. Public perception surveys are also a useful means of measuring residents' preference about their living environment which is considered to be a more objective or rigorous valuation procedure. Field and public perception surveys combined with expert judgments are employed to identify the following: the visual characteristics of a place ; the landscape types of residential suburbs in Melbourne; the public perception of visual characteristics of these suburbs ; the development of a Composite Landscape Model consisting of the following landscape sub-models: 1) Predictive Landscape Sub-Model 2) Quantitative Landscape Sub-Model 3) Descriptive Landscape Sub-Model 4) Perceptual Landscape Sub-Model From analysis of the field and perception surveys, sixty streets from fifteen eastern suburbs in Melbourne have been classified into three groups of residential landscape types. Quantitative factors showing significant correlation with suburban visual appeal were identified from correlation and regression studies. Categorical and descriptive factors were analyzed by paired t-test, ANOVA and multiple response analysis. Multi-dimensioning scale analysis is used for identifying the extent of variation in certain characteristics of suburbs and their groupings. The results of perception surveys from Melbourne and Hong Kong were compared and found to be highly correlated which is consistent with other cross-cultural preferences studies elsewhere in the past and therefore were combined for further analysis. The results formed the basis for the development of Composite Landscape Models for the study area as a whole and landscape sub-types for sixty streets from fifteen suburbs within it. These landscape models and types can be developed by quantifying the key factors contributing to visual characteristics and by carrying out public perception surveys in specific areas. This would lead to the development of Visual Compatibility Models (VCM). The application of these ICI would be useful in comparison of the possible changes caused by the proposed development with the predetermined VCM landscape models. It will assist landuse planners to assess the merits and demerits of any development whether it would contribute to the existing visual characteristic and how well. Therefore this procedure would be useful in decision making in dealing with development and planning proposals. The findings of the research appear to be promising in the determination of visual characteristics and landscape types and demonstrate its potential in developing a landscape model aiming at preserving or even enhancing the visual character of a place. This research appears to be timely given that the Victorian Government intends to consolidate the sprawl of residential areas around Melbourne by increasing the density of residential landuse in the suburbs which would have implications for the visual character of these suburbs.