Scholarly record
MODELLING THE HYDRAULIC BEHAVIOUR OF GREEN ROOFS THROUGH A SEMI-CONCEPTUAL RESERVOIR ELEMENT MODEL
Abstract
Green roofs represent one of the most diffused and representative Low Impact Development techniques (LID). Green roofs consist of a number of layers, including a vegetation layer, a lightweight soil medium, a drainage layer and an impermeable membrane. Recent studies have confirmed the benefits of green roofs. Green roofs are able to retain water, reduce peak flow, improve biodiversity and mitigate heat island. Although the benefits are evident, the transition from traditional urban drainage systems to the sustainable ones is very slow. A limiting factor in spreading the use of such systems is the lack of proper modelling tools for design, especially for the infiltration processes in a growing medium. The infiltration process in the growing medium of the green roof is strongly unsaturated. In this study, a conceptual model is proposed for the hydraulic modelling of the green roof. The model is built on reservoir elements, which are included in most of the existing hydrologic-hydraulic software and which can be easily implemented in any programming code. The green roof is modelled as a cascade of reservoirs. Each layer of the green roof is modelled as a reservoir with a specific flow discharge curve. In this study, the proposed model is calibrated and validated against measured discharges of a green roof installed at the University of Calabria. Several statistical indices have been used in order to assess the accuracy of the model in correctly describe the hydraulic behavior of a green roof. Results confirm the suitability of the proposed model.
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References14
Teemusk, A., Mander, U., Rainwater runoff quantity and quality performance from a greenroof: The effects of short-term events, Ecological Engineering 30, 271–277, 2007.
Fioretti, R., Palla, A., Lanza, L.G., Principi, P., Green roof energy and water related performance in the Mediterranean climate, Building and Environment 45(8), 1890- 1904, 2010.
Dietz, M. E., Low impact development practices: a review of current research and recommendations for future directions, Water, Air and Soil Pollution 186 (1-4), 351-363 2007.
Getter, K. L., Rowe, D., Substrate depth influences Sedum plant community on a green roof, HortScience, 44(2), 401-407, 2009.
DeNardo, J., Jarrett, A., Manbeck, H., Beattie, D., & Berghage, R., Stormwater detention and retention abilities of green roofs, In World Water and Environmental Resources Congress, pp. 23-26, 2003.
Carbone, M., Turco, M., Nigro, G., Piro, P., 2014. Modeling of hydraulic behaviour of green roof in catchment scale. In: 14th SGEM GeoConference on Water Resources. Forest, Marine and Ocean Ecosystems, pp. 471–478. DOI: 10.5593/sgem2014/b31/s12.061.
Brunetti, G., Porti, M., Piro, P., 2018. Multi-level numerical and statistical analysis of the hygrothermal behavior of a non-vegetated green roof in a mediterranean climate. Appl. Energy 221, 204–219. DOI: 10.1016/j.apenergy.2018.03.190
Brunetti, G., Simunek, J., Piro, P., 2016. A comprehensive analysis of the variably-saturated hydraulic behavior of a green roof in a mediterranean climate. Vadose Zo. J. 15, In press. doi:DOI: 10.2136/vzj2016.04.0032
Turco, M., Kodešová, R., Brunetti, G., Nikodem, A., Fér, M., Piro, P., 2017. Unsaturated hydraulic behaviour of a permeable pavement: Laboratory investigation and numerical analysis by using the HYDRUS-2D model. J. Hydrol. 554, 780–791. DOI: 10.1016/j.jhydrol.2017.10.005
Brunetti, G., Šimůnek, J., Turco, M., Piro, P., 2017. On the use of surrogate-based modeling for the numerical analysis of Low Impact Development techniques. J. Hydrol. 548, 263–277. DOI: 10.1016/j.jhydrol.2017.03.013
Brunetti, G., Šimůnek, J., Turco, M., Piro, P., 2018. On the use of global sensitivity analysis for the numerical analysis of permeable pavements. Urban Water J. 15, 269–275. DOI: 10.1080/1573062X.2018.1439975
Van Genuchten M.T., A closed-form equation for predicting the hydraulic conductivity of unsaturated soils, Soil Sci. Soc. Am. J., 1980, 44, 892–898
Moriasi D.N., Arnold J.G., Liew MW Van, Bingner R.L., Harmel R.D., Veith T.L., Model Evaluation Guidelines for Systematic Quantification of Accuraccy in Watershed Simulations,Trans Asabe 2007;50:885–900
Maiolo, M., Carini, M., Capano, G., Piro, P., 2017. Synthetic sustainability index (SSI) based on life cycle assessment approach of low impact development in the Mediterranean area. Cogent Eng. 4. DOI: 10.1080/23311916.2017.1410272
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