This paper investigates urban bioclimatic interventions in the central area of a coastal medium-sized city in Greece. Two urban blocks typical of the urban fabric of the city center and a neighborhood of 38 urban blocks were selected. Different proposed Bioclimatic Renewal Scenarios were investigated through microclimatic simulations using the micro-scale numerical model, ENVI-met. The simulations aimed at assessing various scenarios and examining the effect of the different bioclimatic interventions on the local outdoor environment, such as the application of cool materials, greenery of public open space, and other. Thus a parametric analysis was carried out. A final bioclimatic renewal scenario, based primarily on the parameters, proved to have a positive effect on the local microclimate, was proposed and assessed. The simulation results showed that the final scenario resulted in the most effective heat mitigation strategy for the case studies' microclimate. The vegetation-based scenario also contributed to a significant microclimate improvement in the case studies. The benefits of the various bioclimatic interventions were magnified when these were applied on a spatial scale larger than that of the single urban block, hence on the urban neighborhood scale.
The paper presents an experimental investigation of the microclimatic conditions in selected open spaces in the city centre of Volos, a medium-sized coastal city in Greece. It presents the results of systematic field measurements that took place in three urban sites; a public open space and two typical urban blocks. The measurements were carried out during the summer of 2013 and concerned air temperature and relative humidity recordings. Data collection was used to assess the formation and the eventual differentiation of microclimate on a restricted local scale in the urban environment, such as that of a typical urban block or/and a typical public square in the centre of Greek cities. Additionally, research has taken into account buildings construction materials, the predominant paving materials and the key parameters determined by urban geometry in the selected sites, i.e the Aspect Ratio (H/W) and the Sky View Factor (SVF). The measurements revealed microclimatic differences within the inside open space of two of the urban blocks, i.e the courtyard generated of the different building ownerships, the various street canyons and the recordings of the local meteorological station.
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