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Hydrological Performance of Green Roofs in Mediterranean Climates: A Review and Evaluation of Patterns
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Orientador(es)
Resumo(s)
The capacity of green roofs to intercept rainfall, and consequently store and slow runoff
resulting in a reduction in flood risk, is one of their main advantages. In this review, previous research
related to the influence of green roofs on the hydrological cycle is examined with a special focus on
studies for Mediterranean climate conditions (Csa and Csb according to the Köppen–Geiger climate
classification). This climate is characterized by short and intense rainfall occurrences which, along
with the increased area of impervious surface on Mediterranean regions, intensify the risk of flooding,
particularly in the cities. The analysis covers the variables rainfall retention (R, %), runoff delay (RD,
min or h), peak delay (PD, min or h), peak attenuation (PA, %), and runoff coefficient (RC, -), in
relation to physical features of the green roof such as layers, substrate depth, slope, and vegetation,
as well as, weather conditions, such as monthly temperature and monthly precipitation. Following a
statistical analysis, some patterns for the average rainfall retention (%) were found in the published
literature for green roofs under Mediterranean climate conditions—namely, that the most significant
variables are related to the substrate depth, the existence of certain layers (root barrier, drainage
layer), the origin of the vegetation, the types of green roofs (extensive, semi-intensive, intensive), and
the precipitation and temperature of the location. Moreover, a multivariate analysis was conducted
using multiple linear regression to identify the set of green roof features and weather conditions
that best explain the rainfall retention (%), taking into consideration not only the studies under
Mediterranean conditions but all climates, and a similar pattern emerged. Recommendations for
future research include addressing the effect of physical features and weather conditions on the other
variables (RD, PD, PA, RC) since, although present in some studies, they still do not provide enough
information to reach clear conclusions
Descrição
Review
Palavras-chave
green roof hydrological performance Mediterranean climate rainfall retention
Contexto Educativo
Citação
Silva, J.; Paço, T.A.; Sousa, V.; Silva, C.M. Hydrological Performance of Green Roofs in Mediterranean Climates: A Review and Evaluation of Patterns. Water 2021, 13, 2600
Editora
MDPI