John Ronald Spencer

Bounding Neighbourhoods: How Do Residents Do It?

Abstract The ‘neighbourhood’ holds an iconic position in planning, yet there has been longstanding empirical criticism and debates about both the use and intellectual underpinnings of the concept. Despite this, it continues to provide a focus for local area planning, local policy interventions and urban design approaches, including in new urbanism. Neighbourhoods may be given physical dimensions so the boundaries that distinguish what is within and what is outside each neighbourhood can be defined. This paper asks what we can learn about such localities through a better understanding of how residents themselves actually identify these boundaries. It derives a series of questions that are addressed through analysis of resident perceptions of neighbourhood boundaries in an inner-city fringe suburb in Brisbane, Australia. The research confirmed many previous concerns about defining neighbourhood boundaries and that many residents were uncertain of the physical boundaries of their neighbourhoods.

An investigation of controlling variables of riverbank erosion in sub-tropical Australia

A large proportion of the uncertainty surrounding catchment sediment budget modelling has been attributed to sediment supplied from riverbank erosion. Some of the variables influencing riverbank erosion are bend curvature, specific streampower, riparian vegetation, and in some instances sand and gravel extraction. The empirical relationship between these variables and observed riverbank erosion across 78 km of the Upper Brisbane River, Australia was investigated. No significant relationship was found between curvature, specific streampower and riverbank erosion. The role of riparian vegetation relative to sediment supply from riverbank erosion varied with spatial location, susceptibility of a reach to erosion, and human disturbance such as sand and gravel extraction. Despite not having data on substrate type the model described approximately 37% of the variation in observed riverbank erosion. It appears that inclusion of a management practice factor in riverbank erosion models is justified, where appropriate, and may improve model performance.