Water retention and transfer properties of a Green roof volcanic substrate
The water retention curve and the hydraulic conductivity function of a volcanic coarse granular material used as a substrate in an urban green roof in the Paris area was carried out on a newly developed device, in which low suctions were controlled. In the same cell, a hanging column system was used...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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EDP Sciences
2020-01-01
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| Series: | E3S Web of Conferences |
| Online Access: | https://www.e3s-conferences.org/articles/e3sconf/pdf/2020/55/e3sconf_e-unsat2020_03011.pdf |
| _version_ | 1818610910339530752 |
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| author | Stanic Filip Delage Pierre CUI Yu Jun DE LAURE Emmanuel |
| author_facet | Stanic Filip Delage Pierre CUI Yu Jun DE LAURE Emmanuel |
| author_sort | Stanic Filip |
| collection | DOAJ |
| description | The water retention curve and the hydraulic conductivity function of a volcanic coarse granular material used as a substrate in an urban green roof in the Paris area was carried out on a newly developed device, in which low suctions were controlled. In the same cell, a hanging column system was used for controlling smaller suctions (up to 32 kPa) and the axis translation technique for larger suctions (up to 50 kPa). Water exchanges were monitored in connected tubes by using a high accuracy differential pressure transducer. The step changes in suction were also used to determine the hydraulic conductivity function by means of Gardner’s method, accounting for the impedance effects due to the high air entry value ceramic porous disk with Kunze and Kirkham’s method. van Genuchten and Brooks and Corey models were used for the water retention curve, but the hydraulic conductivity functions derived from these expressions appeared to lead to a significant under-estimation, confirming the need of operational and simple device for the experimental determination of the hydraulic conductivity function. |
| first_indexed | 2024-12-16T15:21:56Z |
| format | Article |
| id | doaj.art-181de90f897d46ecb74cd4f76d524b0a |
| institution | Directory Open Access Journal |
| issn | 2267-1242 |
| language | English |
| last_indexed | 2024-12-16T15:21:56Z |
| publishDate | 2020-01-01 |
| publisher | EDP Sciences |
| record_format | Article |
| series | E3S Web of Conferences |
| spelling | doaj.art-181de90f897d46ecb74cd4f76d524b0a2022-12-21T22:26:37ZengEDP SciencesE3S Web of Conferences2267-12422020-01-011950301110.1051/e3sconf/202019503011e3sconf_e-unsat2020_03011Water retention and transfer properties of a Green roof volcanic substrateStanic Filip0Delage Pierre1CUI Yu Jun2DE LAURE Emmanuel3Ecole des Ponts ParisTech, Navier/CERMES, F 77455 Marne la ValléeEcole des Ponts ParisTech, HMCo, F 77455 Marne la ValléeEcole des Ponts ParisTech, Navier/CERMES, F 77455 Marne la ValléeEcole des Ponts ParisTech, Navier/CERMES, F 77455 Marne la ValléeThe water retention curve and the hydraulic conductivity function of a volcanic coarse granular material used as a substrate in an urban green roof in the Paris area was carried out on a newly developed device, in which low suctions were controlled. In the same cell, a hanging column system was used for controlling smaller suctions (up to 32 kPa) and the axis translation technique for larger suctions (up to 50 kPa). Water exchanges were monitored in connected tubes by using a high accuracy differential pressure transducer. The step changes in suction were also used to determine the hydraulic conductivity function by means of Gardner’s method, accounting for the impedance effects due to the high air entry value ceramic porous disk with Kunze and Kirkham’s method. van Genuchten and Brooks and Corey models were used for the water retention curve, but the hydraulic conductivity functions derived from these expressions appeared to lead to a significant under-estimation, confirming the need of operational and simple device for the experimental determination of the hydraulic conductivity function.https://www.e3s-conferences.org/articles/e3sconf/pdf/2020/55/e3sconf_e-unsat2020_03011.pdf |
| spellingShingle | Stanic Filip Delage Pierre CUI Yu Jun DE LAURE Emmanuel Water retention and transfer properties of a Green roof volcanic substrate E3S Web of Conferences |
| title | Water retention and transfer properties of a Green roof volcanic substrate |
| title_full | Water retention and transfer properties of a Green roof volcanic substrate |
| title_fullStr | Water retention and transfer properties of a Green roof volcanic substrate |
| title_full_unstemmed | Water retention and transfer properties of a Green roof volcanic substrate |
| title_short | Water retention and transfer properties of a Green roof volcanic substrate |
| title_sort | water retention and transfer properties of a green roof volcanic substrate |
| url | https://www.e3s-conferences.org/articles/e3sconf/pdf/2020/55/e3sconf_e-unsat2020_03011.pdf |
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