A qualidade do sombreamento de espécies arbóreas e sua influência no microclima do entorno imediato em ambientes urbanos
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2008-08-13
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Universidade Federal de Goiás
Resumo
This research aimed at assessing quality and influence of shadow offered by four
selected individual arboreous species (Lophantera lactescens chuva-de-ouro, Caesalpinia
peltophoroides sibipiruna, Sapindus saponaria saboneteira e Stryphnodendron
adstringens barbatimão) in attenuating environmental variables Dry Bulb Temperature
(DBT) and Radiant Thermal Load (RTL) and increasing Air Relative Humidity (ARH) under
weather conditions in the municipality of Goiânia-GO, Brazil, in addition to comparing DBT
and ARH values with criterion of thermal comfort for hot climates indicated by Olgyay
Bioclimatic Letter (1998) and adapted by Koenigsberger. In the course of this research, data
concerning the aforementioned variables were collected through four temperature measuring
device placed firstly under the tree shadow (1m), secondly, 5 meters far, thirdly, 10 meters
far, finally, 15 meters far from the trunk (full sun), from September to November 2007, hourly
from 10 o clock in the morning to 2 o clock in the afternoou5yn over three days for each
species. Quantifying contribution of shadow in attenuating and increasing environmental
variables was carried out through calculation of percentage of Relative Variation of values
found in shadow, 5m far and 10m far regarding the values obtained 5m far (full sunlight).
Outcomes analysis was carried out regarding the following hypotheses: i) attenuating DBT in
shadow > attenuating DBT at 5m > attenuating DBT at 10m; ii) attenuating RTL in shadow >
attenuating RTL at 5m > attenuating RTL at 10m and; iii) increasing ARH in shadow >
increasing ARH at 5m > increasing ARH at 10m. The outcomes showed positive effects in
attenuating DBT and RTL and increasing ARH. The species with better results were
Sibipiruna and Barbatimão with better overall scores in attenuating DBT between 5% and
10%, Saboneteira and Sibipiruna in the ARH variable providing increasing higher than 30%,
and Sibipiruna in shadow in RTL with attenuation around 15%. The field outcomes compared
with comfort criteria demonstrated the influence of the arboreous species studied on
microclimate improvement in its surrounding areas.
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Citação
HERRMANN, Carla Rosana Azambuja. The quality of shade tree species and their
influence the microclimate of the immediate surrounding environments
Urban. 2008. 160 f. Dissertação (Mestrado em Engenharias) - Universidade Federal de Goiás, Goiânia, 2008.