Comparative microclimate and dewfall measurements at an urban green roof versus bitumen roof

Heusinger, Jannik; Weber, Stephan

doi:10.1016/j.buildenv.2015.06.002

Cited by 47 publications

(18 citation statements)

References 40 publications

(48 reference statements)

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“…At an air temperature of 30 • C, the temperature of the conventional roof reached 53 • C compared to 27 • C for the green roofs. This confirms the studies of other authors showing that green roofs reduce the temperature of the roof surface which heated on hot days [15,[51][52][53][54]. This increased peak and the high summer temperatures associated with it, have a significant influence on the durability of the roof membrane, and therefore its lifespan [55].…”

Section: Discussionsupporting

confidence: 89%

Changes in Temperature and Moisture Content of an Extensive-Type Green Roof

et al. 2019

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Green roofs ought to be perceived as ensuring a wide-ranging contribution to the sustainable urban environment. The aim of the study was; (1) to investigate and analyse the differences in the surface temperature between four models of green roofs of the extensive type and a conventional roof (covered with bitumen) under the conditions of a continental climate; (2) to assess the influence of environmental parameters (climatic water balance, air temperature, relative humidity, moisture content in the profile) on changes in the temperature of the extensive type green roof profile (substrate and vegetation mat). The study (1) was carried out during the period of June–December 2016 using a thermal imaging camera. As a result, the greatest differences in temperature were noted in June and July, with a maximum difference between the temporary surface temperature of a green roof and a conventional roof of up to 24 °C. The (2) study was conducted on a green roof profile with sedum plant vegetation. The measured parameters were: the temperature of the surface, the temperature and humidity at depths of 3 cm and 15 cm, and active radiation in the photosynthesis process (PAR). As the result, the range of daily changes in the surface temperatures and the vegetation mat were higher than the range of changes in the air temperature. Atmospheric precipitation decreased the thermal gradient in the soil, as well as the temperature fluctuations in the course of a day as a result of the increase in humidity following a rainfall. During the summer period, over the course of a day, the surface temperature was 5 °C higher than the air temperature. The largest correlation was obtained between the air temperature and the temperature of the surface as well as the temperature of the structural layers.

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Section: Discussionsupporting

confidence: 89%

Changes in Temperature and Moisture Content of an Extensive-Type Green Roof

et al. 2019

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“…The analysis shows that dew corresponds on average to 5.1% and 6.2% of the total annual amount of precipitation at Wüstebach and Rollesbroich, respectively. This is in line with previous investigations at Rollesbroich (Groh, Slawitsch, et al, 2018), Wüstebach (Groh, Stumpp, et al, 2018), and other grasslands sites under humid climate conditions, which showed that dew contributes between 4.5% and 6.9% of the total annual precipitation (Heusinger & Weber, 2015;Jacobs et al, 2006;Xiao et al, 2009). The different parameterized PM models were also used to predict dew formation.…”

Section: Water Resources Researchsupporting

confidence: 92%

Quantification and Prediction of Nighttime Evapotranspiration for Two Distinct Grassland Ecosystems

Groh

Pütz

Gerke

et al. 2019

Water Resources Research

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Evapotranspiration (ET) is, after precipitation, the second largest flux at the land surface in the water cycle and occurs mainly during daytime. Less attention has been given to water fluxes from the land surface into the atmosphere during nighttime (i.e., between sunset and sunrise). The nighttime ET (ETN) may be estimated based on models that use meteorological data; however, due to missing experimental long‐term data, the verification of ETN estimates is limited. In this paper, the amount of ETN for two grassland ecosystems was determined from highly temporally resolved and precise weighing lysimeter data. We found that annual ETN ranged between 3.5% and 9.5% of daytime annual ET (ETD) and occurred mainly during wet soil and canopy surface conditions, which suggests that ETN is largely related to evaporation. ETN was positively correlated with wind speed. Dew formation, ranging from 4.8% to 6.4% of annual precipitation, was in absolute terms larger than ETN. The prediction of ETN with the Penman‐Monteith model improved if the aerodynamic and surface resistance parameters were based on vegetation height observations and the nighttime stomatal resistance parameter was assumed to be zero. The occurrence of hot days during the observation period showed to increase average ETN rates. Our results suggest that ETN can be observed with precision weighing lysimeters, was a not negligible component in the water balance of the grassland ecosystems, and thus needs more attention when simulating land surface hydrological processes.

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“…The greatest differences in surface temperature were obtained in the summer periods, at maximum heating up. This confi rms the results reported by other authors showing that green roofs reduce the temperature of roof surface which is heated up on hot days (Heusinger & Weber, 2015;Solcerova, van de Ven, Wang, Rijsdijk & van de Giesen, 2017). In September, the differences of heating of different surfaces were lower than in summer (the maximum difference between the green area and the conventional roof was 10°C).…”

Section: Recapitulationsupporting

confidence: 90%

Surface temperature analysis of conventional roof and different use forms of the green roof

Baryła

Bus

Karczmarczyk

et al. 2019

srees

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Increasing urban populations raises a number of problems and risks that are strengthened by observed and projected climate change. An increase in green areas (so-called green infrastructure) has turned out to be an effective means of lowering temperature in the city. Green roofs can be one of the possible measures leading to achieving this aim. The aim of the study was the analysis of temperature changes of different roof surfaces (conventional roof, board, intensive roof substrate without plant cover, substrate covered with plants (shrubs). Studies on comparing the temperature between a conventional roof and green roofs were carried out in the period from April to September 2015 on the roof of the building of the Faculty of Modern Languages, University of Warsaw. The measurement was performed using the FLIR SC620 thermal imaging system. As a result of the tests, it was found that in the summer months the differences between the temperature of the green roof and the conventional roof amounted to a maximum of 31.3°C. The obtained results showed that the roof with vegetation can signifi cantly contribute to the mitigation of the urban heat island phenomenon in urban areas during summer periods.

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Comparative microclimate and dewfall measurements at an urban green roof versus bitumen roof

Cited by 47 publications

References 40 publications

Changes in Temperature and Moisture Content of an Extensive-Type Green Roof

Changes in Temperature and Moisture Content of an Extensive-Type Green Roof

Quantification and Prediction of Nighttime Evapotranspiration for Two Distinct Grassland Ecosystems

Surface temperature analysis of conventional roof and different use forms of the green roof

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