Green roof aging: Quantifying the impact of substrate evolution on hydraulic performances at the lab-scale

Bouzouidja, Ryad; Séré, Geoffroy; Claverie, Rémy; Ouvrard, Stéphanie; Nuttens, L.; Lacroix, David

doi:10.1016/j.jhydrol.2018.07.032

Cited by 29 publications

(20 citation statements)

References 45 publications

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“…As shown in Figure 10, the saturated hydraulic conductivity k s of the soil columns used in this study were compared to those green roof substrates in other studies (Bouzouidja et al, 2018; Braswell, Winston, & Hunt, 2018; Poë, Stovin, & Berretta, 2015; Song, Li, Zhou, & Fredlund, 2017; Soulis, Valiantzas, Ntoulas, Kargas, & Nektarios, 2017). Notice that the saturated hydraulic conductivities of bare soils (NS and BAS) in this study were lower than those of most green roof substrates, because of the low permeability clay adopted in the present study.…”

Section: Discussionmentioning

confidence: 99%

“…The water runoff was including surface runoff and bottom drainage. For runoff delay analysis, such crucial parameters as initial water content should be taken into account in the comparisons between substrates (Bouzouidja et al, 2018). Four one-dimensional models with the same sizes, boundary condition, initial condition (i.e., initial water content 0.3 cm 3 /cm 3 ) but with different hydraulic parameters (tabulated in Table 3) were built in HYDRUS-1D.…”

Section: Influence Of Individual and Combined Effects Of Biochar Anmentioning

confidence: 99%

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Experimental study on the hydrological performance of green roofs in the application of novel biochar

Huang

Garg

Mei

et al. 2020

Hydrological Processes

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Biochar has the potential to be a soil amendment in green roofs owing to its water retention, nutrient supply, and carbon sequestration application. The combined effects of biochar and vegetated soil on hydraulic performance (e.g., saturated hydraulic conductivity, retention and detention, and runoff delay) are the crucial factor for the application of the novel biochar in green roofs. Recent studies investigated soil water potential (i.e., suction) either on vegetated soil or on biochar-amended soil but rarely focused on their integrated application. With the purpose of investigating the hydraulic performance of green roofs in the application of biochar, the combined effect of biochar and vegetated soil on hydrological processes was explored. Artificial rainfall experiments were conducted on the four types of experimental soil columns, including natural soil, biochar-amended soil, vegetated natural soil, and vegetated biocharamended soil. The surface ponding, bottom drainage and the volumetric water content were measured during the rainfall test. Simulation method by using HYDRUS-1D was adopted for estimating hydraulic parameters and developing modelling analysis. The results indicated that the saturated hydraulic conductivity of vegetated soil columns were higher than bare soil columns. The addition of biochar decreased the saturated hydraulic conductivity, and the magnitude of decrease was much significant in the case of vegetated soil. The influence of vegetation on permeability is more prominent than biochar. The vegetated biochar-amended soil has the highest retention and detention capacity, and shows a preferable runoff delay effect under heavy rain among the four soil columns. The results from the present study help to understand the hydrological processes in the green roof in the application of biochar, and imply that biochar can be an alternative soil amendment to improve the hydraulic performance.

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Section: Discussionmentioning

confidence: 99%

Section: Influence Of Individual and Combined Effects Of Biochar Anmentioning

confidence: 99%

Experimental study on the hydrological performance of green roofs in the application of novel biochar

Huang

Garg

Mei

et al. 2020

Hydrological Processes

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“…At the laboratory scale, experimental control tests of SuDS have been undertaken over the last 20 years (Sanudo-Fontaneda et al, 2018;van Woert et al, 2005). Models to determine the effectiveness of both extensive and intensive green roofs have demonstrated their ability to reduce runoff received from traditional tiled roofs (Bouzouidja et al, 2018;Lee et al, 2013;van Woert et al, 2005). Stovin et al (2015a) monitored a number of rainfall scenarios over a four year period to analyse the water retention capabilities of a green roof, taking into account the effects of the vegetation type, density and structure of the green roof.…”

Section: Sustainable Drainage Systemsmentioning

confidence: 99%

Advances in experimental modelling of urban flooding

Rubinato

Lashford

Goerke³

2021

Water-Wise Cities and Sustainable Water Systems: Concepts, Technologies, and Applications

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Flooding impacts more people annually than any other natural hazards, and the 21st century has seen a rise in the number of extreme meteorological events (CRED, 2019; Depietri & McPhearson, 2018). Flooding, including coastal, fluvial and pluvial, costs the global economy US$19.7 billion in 2018, with densely populated urban areas typically exposed to 'flash flooding' as a result of intense rainfalls that exceed the anthropogenic and natural drainage capacity of a city (CRED, 2019) (Figure 9.1). Recent years have seen a number of significant floods impacting cities globally; between June and July 2016, flooding is estimated to have impacted over 32 million people in China alone (Tang et al., 2017). While these events, and many others globally, cannot be entirely mitigated, there is an intrinsic vulnerability to flooding associated with living in urban areas which is further exacerbated by increasing urbanisation, and a changing climate (Miller & Hutchins, 2017; Rubinato et al., 2020).

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“…As noted above, it is expensive to transport soil, and the removal of the old soil creates a problematic waste product. This solution is particularly difficult to implement in developing countries (Bradshaw, 1997;Hüttl and Bradshaw, 2000). Another, less common, solution to urban soil problems that has been applied in specific cases on smaller scales is using organic amendments present in the city, such as composts, sludge, industrial by-products, and biosolids, to improve topsoil characteristics (Larney and Angers, 2012).…”

Section: Existing Solutions For Providing Functional Soils In Citiesmentioning

confidence: 99%

Using constructed soils for green infrastructure – challenges and limitations

Deeb

Groffman

Blouin

et al. 2020

SOIL

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Abstract. With the rise in urban population comes a demand for solutions to offset environmental problems caused by urbanization. Green infrastructure (GI) refers to engineered features that provide multiecological functions in urban spaces. Soils are a fundamental component of GI, playing key roles in supporting plant growth, infiltration, and biological activities that contribute to the maintenance of air and water quality. However, urban soils are often physically, chemically, or biologically unsuitable for use in GI features. Constructed Technosols (CTs), consisting of mixtures of organic and mineral waste, are man-made soils designed to meet specific requirements and have great potential for use in GI. This review covers (1) current methods to create CTs adapted for various GI designs and (2) published examples in which CTs have been used in GI. We address the main steps for building CTs, the materials and which formulae should be used to design functional CTs, and the technical constraints of using CTs for applications in parks and square lawns, tree-lined streets, green buffer for storm water management, urban farming, and reclaimed derelict land. The analysis suggests that the composition and structure of CTs should and can be adapted to available wastes and by-products and to future land use and environmental conditions. CTs have a high potential to provide multiple soil functions in diverse situations and to contribute to greening efforts in cities (and beyond) across the world.

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Green roof aging: Quantifying the impact of substrate evolution on hydraulic performances at the lab-scale

Cited by 29 publications

References 45 publications

Experimental study on the hydrological performance of green roofs in the application of novel biochar

Experimental study on the hydrological performance of green roofs in the application of novel biochar

Advances in experimental modelling of urban flooding

Using constructed soils for green infrastructure – challenges and limitations

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