Hydrological and thermal regime of a thin green roof system evaluated by physically-based model

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21110%2F20%3A00336263" target="_blank" >RIV/68407700:21110/20:00336263 - isvavai.cz</a>

Alternative codes found

RIV/68407700:21720/20:00336263

Result on the web

<a href="http://hdl.handle.net/10467/86052" target="_blank" >http://hdl.handle.net/10467/86052</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.ufug.2020.126582" target="_blank" >10.1016/j.ufug.2020.126582</a>

Result language

angličtina

Original language name

Hydrological and thermal regime of a thin green roof system evaluated by physically-based model

Original language description

Green roofs, as an element of the green infrastructure, contribute to the urban heat island effect mitigation and the urban drainage outflow reduction. To achieve the desired functions, it is essential to understand the role of the individual roof layers and ensure their proper design.A physically-based model was used to assess the hydrological and thermal regime of two experimental green roof test beds containing distinct soil substrates (a local Technosol and a more permeable commercial substrate “Optigreen”). The test beds together with a meteorological station were built on the building green roof. Each test bed has an effective area of one square meter and is equipped with a soil temperature sensor and an outflow gauge; one of the test beds is continuously weighed. The observed conditions were simulated using one-dimensional numerical model describing the water flow in variably saturated porous medium by Richards’ equation and the heat transport by the advection-conduction equation.The model was able to satisfactorily reproduce the measured outflow and soil temperature. The water-potential-gradient based root water uptake module effectively captured the water storage depletion between the rainfall events. The difference between the two soil substrates tested is demonstrated by the contrasting ability of the soil layers to retain water. Model representation of the thermal conditions within the green roof soils was achieved using independently evaluated thermal properties of the soils and drainage board. The model was also used to analyze the effects of the substrate depth and type of vegetation cover on the transpiration and soil water regime of the green roofs. Increasing the substrate depth causes a rise of root water uptake and induces a significant reduction of the maximal temperature. The thinner soil profiles are more sensitive to the plant species selection.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10501 - Hydrology

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2020

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Urban Forestry & Urban Greening

ISSN

1618-8667

e-ISSN

1610-8167

Volume of the periodical

48

Issue of the periodical within the volume

February

Country of publishing house

DE - GERMANY

Number of pages

11

Pages from-to

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UT code for WoS article

000512752000035

EID of the result in the Scopus database

2-s2.0-85077654155