It has become increasingly important to study the urban heat island phenomenon due to the adverse effects on summertime cooling energy demand, air and water quality and most importantly, heat-related illness and mortality. The present article analyses the magnitude and the characteristics of the urban heat island in Sydney, Australia. Climatic data from six meteorological stations distributed around the greater Sydney region and covering a period of 10 years are used. It is found that both strong urban heat island (UHI) and oasis phenomena are developed. The average maximum magnitude of the phenomena may exceed 6 K. The intensity and the characteristics of the phenomena are strongly influenced by the synoptic weather conditions and in particular the development of the sea breeze and the westerly winds from the desert area. The magnitude of the urban heat island varies between 0 and 11 • C, as a function of the prevailing weather conditions. The urban heat island mainly develops during the warm summer season while the oasis phenomenon is stronger during the winter and intermediate seasons. Using data from an extended network of stations the distribution of Cooling Degree Days in the greater Sydney area is calculated. It is found that because of the intense development of the UHI, Cooling Degree Days in Western Sydney are about three times higher than in the Eastern coastal zone. The present study will help us to better design and implement urban mitigation strategies to counterbalance the impact of the urban heat island in the city.
This study is to assess developers' market readiness to green construction including their ideas on green construction, their understanding of current green building policies, their awareness and familiarity with green building and related industries, and the barriers they are facing for implementing green building projects. By eleven face-to-face semi-structured interviews with locally-based developers, the study finds that the Green Building Market in Hong Kong is basically ready in technology level. However, the motivation for green development is confined to commercial buildings for lease. Legislation is agreed by developers as an effective motivator to green building development. An effective mechanism to provide incentives for market players to adopt green voluntarily is explored in this paper. Expedited permits and density bonus are thought to be major incentives.
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