Hydrological Performance of Green Roof Systems: A Numerical Investigation

Kim, Sang Yeob; Na, Wooyoung; Jun, Changhyun; Seo, Hyungjoon; Kim, Yongmin

doi:10.3389/fenvs.2021.806697

Cited by 4 publications

(4 citation statements)

References 40 publications

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“…As a result, SWMM and HYDRUS -1D models predicted with higher accuracy in the convective events while the Nash model appeared more suitable for stratiform events. Kim et al (2021) simulated the rainfall-runoff relationship within the green roof system by using the SEEP/W model and is verified the applicability of this model. That study simulated the green roof system by varying four factors (soil type, rainfall intensity, substrate depth, and green roof slope) to explore the hydrological performance through the peak discharge to rainfall intensity ratio and the rain water retention rate.…”

Section: Development and Application Of Models To Simulate Hydrologic...mentioning

confidence: 65%

Estimation of possible locations for green roofs and bioswales and analysis of the effect of their implementation on stormwater runoff control

Kinoshita,

Ozaki

2024

Front. Clim.

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IntroductionThe objectives of this study are twofold. The first is to identify potential green infrastructure construction sites by building rooftops and sidewalks. The second is to analyze internal flooding for a wide range of drainage areas and to quantitatively evaluate the effectiveness of stormwater runoff control.MethodsThe target area has approximately 600 ha with a runoff coefficient of 0.71. Using Arc GIS Desktop 10.8.1, this study has identified green roofs and bioswales that would be highly beneficial in capturing large amounts of rainfall. In addition, Info Works ICM was used for the inundation analysis, which can simultaneously calculate the flow in sewer pipelines and above-ground inundation flow. Runoff coefficients were calculated for each land use using the urban land use subdivision mesh data with 100 m unit. This study targeted a 10-year probability rainfall (total rainfall: 86.3 mm, maximum hourly rainfall: 52.3 mm/h, duration: 3 h) with a middle concentrated rainfall waveform obtained from past experiments in the d4PDF database of ensemble climate prediction contributing to global warming.ResultsThe amount of land availability for green roofs and bioswales was about 1 and 0.1% of the drainage area, respectively. The runoff coefficients for green roofs only, bioswales only, with and without introduction of both green roofs and bioswales were 70.34, 70.87, 70.28, and 70.93%, respectively. The difference in runoff coefficients was about 0.65 percentage points even when both were constructed. As a result of inundation analysis, the reduction was 2.5% for the maximum waterlogged area, 1.5% for the flooded area, and 0.7% for the average depth of waterlogging divided by the maximum waterlogged area. The construction of green roofs and bioswales in the same area or downstream of the area shows little mitigation effect when flooding occurs in an area near the downstream end of the sewer network.DiscussionAlthough this study has mainly discussed the stormwater runoff control aspect, the most important feature of green infrastructure is its multifunctionality. In terms of utilizing and promoting green infrastructure, it is important to visualize its multifaceted effects and share them with many stakeholders.

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Section: Development and Application Of Models To Simulate Hydrologic...mentioning

confidence: 65%

Estimation of possible locations for green roofs and bioswales and analysis of the effect of their implementation on stormwater runoff control

Kinoshita,

Ozaki

2024

Front. Clim.

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“…Secondly, knowledge on processes and performance assessment methodologies can vary widely from one ecosystem service to the other. For instance, hydrological processes are very well studied and quantified [4,14,15,[72][73][74][75][76] and performance assessment indicators are near unanimous between experts [8,62, [77][78][79][80]. Thermal processes of NBS are thoroughly studied as well [63, [81][82][83] but indicators are more debatable because thermic relates not only to quantitative characteristics (e.g., change in temperature) but to human perception as well (e.g., inhabitant comfort) which can be measured through a variety of methods [84].…”

Section: Conclusion and Further Prospectsmentioning

confidence: 99%

Performance assessment of the ecosystem services provided by urban Nature-based solutions: focus on rainwater management

Valois,

Brachet,

Schiopu

et al. 2023

IOP Conf. Ser.: Earth Environ. Sci.

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Nature-based solutions (NBS) in cities are known to provide numerous ecosystem services that contribute to the well-being of city inhabitants and to climate change attenuation and adaptation. Common services provided by the NBS are urban heat island reduction, provision of habitat for biodiversity, rainwater management, indoor summer comfort, etc. To provide science-based arguments for the choice of the adapted solutions to a specific context, the assessment of those services is necessary. The aim of this paper is to review models assessing the service of rainwater management for three green infrastructures: green roofs, urban trees (stand-alone or micro-forest) and vegetated permeable pavements. The final goal of this work is to help improve the decision aid tools for the environmental assessment of the performance of buildings and districts. The characteristics of each model are presented and analyzed, in terms of robustness, parsimony and operationality. We for example compared the number of required parameters (e.g., plant species, substrate type and depth of green roofs, soil moisture, etc.), the availability of these parameters, etc. The multifunctionality of NBS (i.e., other services provided beyond the contribution to the rainwater management) is also considered in the analysis. In addition, as NBS are living systems, their specific needs (such as water and mineral nutrients), as well as the influence of the local context (e.g., climatic, topographic, cultural) are discussed. Finally, some paths for the implementation of the models into the decision tools are highlighted. The main challenge for the implementation in decision tools could be the harmonization between different expertises and stakes.

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“…Several papers refer to the hydrological performance of GR in different climates [43][44][45] or to approaches used to simulate it [46,47]. Currently, there is a consensus regarding the positive effect of green roofs in relation to rain retention; however, varying results have been reported in the literature [48].…”

Section: Introductionmentioning

confidence: 99%

Hydrological Analysis of Green Roofs Performance under a Mediterranean Climate: A Case Study in Lisbon, Portugal

et al. 2023

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In this paper, the hydrological performance of eight pilot green roofs (GR) installed in Lisbon, Portugal, under a Mediterranean climate is analyzed. The pilot units were installed at Instituto Superior Técnico campus of Lisbon University. The pilots present different plant species and different substrate types, with some of the units incorporating recycled construction and demolition waste (RCW). The green roofs pilots’ hydrologic performance was evaluated through the simulation of artificial precipitation events between March 2021 and July 2021. Considering the results obtained, it can be concluded that the inclusion of RCW in the substrate composition did not hinder the development of vegetation or the hydrological performance of GR. The results showed a rainfall water retention per event ranging from 37% to 100%, with an average rainfall retention of about 81%. The runoff delay ranged from 2 to 18 min, and the peak attenuation ranged from 30 to 100%. The results indicated that previous substrate moisture strongly influences the hydrological performance of GR. As the inclusion of RCW in the substrate composition promotes a more effective drainage of the substrate during dry conditions, it is considered that RCW may have positive impacts on GR’s hydrological performance.

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Hydrological Performance of Green Roof Systems: A Numerical Investigation

Cited by 4 publications

References 40 publications

Estimation of possible locations for green roofs and bioswales and analysis of the effect of their implementation on stormwater runoff control

Estimation of possible locations for green roofs and bioswales and analysis of the effect of their implementation on stormwater runoff control

Performance assessment of the ecosystem services provided by urban Nature-based solutions: focus on rainwater management

Hydrological Analysis of Green Roofs Performance under a Mediterranean Climate: A Case Study in Lisbon, Portugal

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