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

Autor: Stéphanie Ouvrard, L. Nuttens, Ryad Bouzouidja, Rémy Claverie, Geoffroy Séré, David Lacroix
Přispěvatelé: Laboratoire Sols et Environnement (LSE), Institut National de la Recherche Agronomique (INRA)-Université de Lorraine (UL), Centre d'études techniques de l'équipement Est (CETE Est), Avant création Cerema, Laboratoire d'Energétique et de Mécanique Théorique Appliquée (LEMTA ), Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS), Unité de Recherche Environnement Physique de la plante Horticole (EPHOR), AGROCAMPUS OUEST-Université d'Angers (UA), Laboratoire de Planétologie et Géodynamique UMR6112 (LPG), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Nantes - Faculté des Sciences et des Techniques, Université de Nantes (UN)-Université de Nantes (UN)-Université d'Angers (UA), Centre d'Etudes et d'Expertise sur les Risques, l'Environnement, la Mobilité et l'Aménagement - Direction Est (Cerema Direction Est), Centre d'Etudes et d'Expertise sur les Risques, l'Environnement, la Mobilité et l'Aménagement (Cerema), Chercheur indépendant, AGROCAMPUS OUEST, Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Université d'Angers (UA), Laboratoire de Planétologie et Géodynamique [UMR 6112] (LPG), Université d'Angers (UA)-Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST), Université de Nantes (UN)-Université de Nantes (UN)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Énergies et Mécanique Théorique et Appliquée (LEMTA ), French National Association of research and technology (ANRT), through a CIFRE grant (Conventions Industrielles de Formation par la Recherche) research - an association and a company (NIDAPLAST), Université d'Angers (UA)-AGROCAMPUS OUEST, Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)
Jazyk: angličtina
Rok vydání: 2018
Předmět:
0208 environmental biotechnology
Green roof
Stormwater
Soil science
02 engineering and technology
Numerical simulation
010501 environmental sciences
01 natural sciences
Hydrological performance
[SPI.MECA.MEFL]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Fluids mechanics [physics.class-ph]
Inverse modelling
Evapotranspiration
11. Sustainability
medicine
[SDU.STU.HY]Sciences of the Universe [physics]/Earth Sciences/Hydrology
Porosity
Water content
ComputingMilieux_MISCELLANEOUS
0105 earth and related environmental sciences
Water Science and Technology
Pedogenesis
Hydrodynamic
[INFO.INFO-MO]Computer Science [cs]/Modeling and Simulation
020801 environmental engineering
Water retention
Substrate (building)
HYDROLOGICAL PERFORMANCE
RUNOFF RETENTION
WATER-RETENTION
POROUS-MEDIA
STORMWATER
EVAPOTRANSPIRATION
CONDUCTIVITY
BIODIVERSITY
MANAGEMENT
VEGETATION
[SPI.MECA.THER]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Thermics [physics.class-ph]
Environmental science
medicine.symptom
Porous medium
Substrate
Zdroj: Journal of Hydrology
Journal of Hydrology, Elsevier, 2018, 564, pp.416-423. ⟨10.1016/j.jhydrol.2018.07.032⟩
ISSN: 0022-1694
DOI: 10.1016/j.jhydrol.2018.07.032⟩
Popis: International audience; Green roofs are valuable solutions for rain management improvements in urban areas as they can partly store and delay rainfall water. Here, we point out that green roofs cannot be considered as static systems, which performances remain constant over time. This work is based on the cross-use of a lab-scale experiment and a modelling approach to evaluate the hydraulic performances of a green roof substrate over time. Experiments were conducted on new and aged materials, after 30 months of in situ aging. The experimental device was designed and implemented to simulate irrigation or rainfall and accurately monitor hydraulic fluxes. An estimation of hydraulic parameters was obtained by using inverse modelling of experimental data with HYDRUS-1D software. Comparisons between measured and modelled data demonstrated the reliability of the model for simulating the hydraulic behavior of the green roofs. Considering an incoming water event – which mimics a heavy rainfall – of 43 mm h−1 and similar water content initial conditions, our simulations indicate that the retention capacity and the delay effect were always higher for the new substrate than for the aged one. Both of these performance indicators strongly vary with the initial water content of the substrates. Whereas the relation is linear for the retention capacity ranging from 100% of retention for the drier conditions to 0% for the saturated substrates, it is more complex for the delay effect. Such performances were comparable to analogous data from the existing literature. Furthermore, this comparison confirmed that green roofs are submitted to an early aging in terms of structure, i.e. porosity. In our study, the aged substrate presented less favorable performances thus highlighting the key role of the composition of green roof substrate not only on the initial performances but also on their sustainability.
Databáze: OpenAIRE
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