Role of Substrates Used for Green Roofs in Limiting Rainwater Runoff

Baryła, Anna; Karczmarczyk, Agnieszka; Bus, Agnieszka

doi:10.12911/22998993/91268

Cited by 15 publications

(18 citation statements)

References 34 publications

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“…Source: own study. Similarity to studies regarding the retention ability of green roofs and retention ability of substrates [BARYŁA et al 2018b], decreases along with an increase in the rainfall depth (Fig. 3].…”

Section: Results Of Studiessupporting

confidence: 86%

“…These systems copy the relationships taking place between a natural catchment, returning the imbalanced proportions between the processes of retention, infil-tration, transpirations and decontamination with the use of plants. Green roofs play a significant role in sustainable drainage systems [BARYŁA et al 2018b;BUS et al 2016;PALLA et al 2010;PĘCZKOWSKI et al 2018;SOBCZYK, MROWIEC 2016;VILLARREAL, BENGTSSON 2005]. In addition to hydrological abilities, green roofs decrease the effect of urban heat islands [WONG, JIM 2015], decrease energy usage by cooling the roof in the summer period [BANTING et al 2017], create a habitat for plants and animals, thus improving urban biodiversity [CATALANO et al 2018;EMILSSON et al 2007;KÖHLER 2006], improve the aesthetics of cities [BENGTSSON et al 2005;STOVIN et al 2012;SZOTA et al 2017].…”

Section: Introductionmentioning

confidence: 99%

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Role of drainage layer on green roofs in limiting the runoff of rainwater from urbanized areas

Baryła¹

2019

Journal of Water and Land Development

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Green roofs play a significant role in sustainable drainage systems. They form absorbent surfaces for rainwater, which they retain with the aid of profile and plants. Such roofs therefore take an active part in improving the climatic conditions of a city and, more broadly, the water balance of urbanized areas. One of the factors influencing the hydrological efficiency of green roofs is the drainage layer. In the article, column studies were carried out under field conditions involving the comparison of the retention abilities of two aggregates serving as the drainage layer of green roofs, i.e. Leca® and quartzite grit. The average retention of the substrate was 48%; for a 5 cm drainage layer of Leca® retention was 57%, for a 10 cm layer of Leca average retention was 61%. For a 5 cm layer of quartzite grit average retention was 50%, for 10 cm layer of quartzite grit 53%. The highest retention was obtained for the column with the substrate and 10-centimeter layer of Leca®. At the same time, it was shown that Leca® is a better retention material than quartzite grit. The initial state of substrate moisture content from a green roof appears to be a significant factor in reducing rainfall runoff from a green roof; the obtained values of initial moisture content made for a higher correlation than the antecedent dry weather period.

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Section: Results Of Studiessupporting

confidence: 86%

Section: Introductionmentioning

confidence: 99%

Role of drainage layer on green roofs in limiting the runoff of rainwater from urbanized areas

Baryła¹

2019

Journal of Water and Land Development

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“…Some studies have shown that the value of (C) may vary depending on the slope of the green roof, the thickness of the substrate layer and the type of vegetation, as well as the amount of water accumulated in its structure prior to the rain event [63]. The hydrological response of roofs is also influenced by the function of its configuration, with the substrate or growing media [64], and with the combination of drainage and vegetation layers [51].…”

Section: Green Roof Efficiency-expected Retentionmentioning

confidence: 99%

Assessing the Retention Capacity of an Experimental Green Roof Prototype

Silva

Najjar

Hammad

et al. 2019

Water

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Cities with high urbanization produce impervious areas. Drainage network overload results in recurring flooding. Much of the damage could be prevented through proper urban planning and good drainage practices. While Low Impact Development techniques have been known for several years, it is essential to encourage the association of this type of technology with conventional micro-drainage structures to increase rainfall runoff at the source where it is generated. Thus, the present work aims to analyze the efficiency of the use of the green roof technique in reducing the peak of the flow and the retention capacity when subjected to heavy rains at the building scale, and also explores its effects in tropical climatic zones with measurements during the summer and fall. The method used was experimental analysis of the Green Roof prototype with bromeliad’s at CESA-UFRJ, whose main results are the hydrogram of each rain event and the runoff coefficient for rainfall in the range of 100 mm/h and 150 mm/h.

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“…The type of substrate and its depth play an important role in green roofs [26,27]. The substrate is a specific and modified mixture, which is usually lighter than soil, porous, mainly inorganic and capable of sustaining plant growth [28,29]. The depth of the substrate can range from a few centimetres to a metre.…”

Section: Introductionmentioning

confidence: 99%

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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Role of Substrates Used for Green Roofs in Limiting Rainwater Runoff

Cited by 15 publications

References 34 publications

Role of drainage layer on green roofs in limiting the runoff of rainwater from urbanized areas

Role of drainage layer on green roofs in limiting the runoff of rainwater from urbanized areas

Assessing the Retention Capacity of an Experimental Green Roof Prototype

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

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