Browsing by Author "Matzarakis, Andreas"

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Effects of UrbanConfiguration on human thermal conditions in a typical tropical African Coastal City
(Hindawi Publishing Corporation, 2013) Ndetto, Emmanuel Lubango; Matzarakis, Andreas
A long-term simulation of urban climate was done using the easily available long-term meteorological data from a nearby synoptic station in a tropical coastal city of Dar es Salaam, Tanzania. he study aimed at determining the efects of buildings’ height and street orientations on human thermal conditions at pedestrian level. he urban coniguration was represented by a typical urban street and a small urban park near the seaside. he simulations were conducted in the microscale applied climate model of RayMan, and results were interpreted in terms of the thermal comfort parameters of mean radiant (� mrt ) and physiologically equivalent (PET) temperatures. PET values, high as 34 ∘ C, are observed to prevail during the aternoons especially in the east-west oriented streets, and buildings’ height of 5 m has less efect on the thermal comfort. he optimal reduction of � mrt and PET values for pedestrians was observed on the nearly north-south reoriented streets and with increased buildings’ height especially close to 100 m. Likewise, buildings close to the park enhance comfort conditions in the park through additional shadow. he study provides design implications and management of open spaces like urban parks in cities for the sake of improving thermal comfort conditions for pedestrians.
Urban climate and bioclimate of Dar es Salaam, Tanzania – preliminary results
(Meteorological Institute, Albert-Ludwigs University Freiburg, Freiburg im Breisgau, Germany, 2012) Ndetto, Emmanuel L; Matzarakis, Andreas
Understanding of the urban climate of a city is important for future planning and human wellbeing. The well known Physiologically Equivalent Temperature (PET) and the Universal Thermal Climate Index (UTCI) indices were calculated with RayMan model using meteorological data (2001-2011) in order to study the human thermal bioclimate of Dar es Salaam. Results indicate that afternoons from late September to May is the heat stressful period. On the other hand, the June-August period is relatively a comfortable time of the year especially the morning hours. These results are however treated as preliminary to the detailed and reliable study that uses hourly datasets and of a long duration.