Field-scale assessment of the unsaturated hydraulic properties of residual soils in southeastern Brazil
Field tests were carried out to estimate effective unsaturated soil hydraulic properties of layered residual soils in Rio de Janeiro, southeastern Brazil. Data of this type are important for understanding the initiation of rainstorm-induced soil landslides, which often occur in the state of Rio de J...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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Sciendo
2022-06-01
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| Series: | Journal of Hydrology and Hydromechanics |
| Subjects: | |
| Online Access: | https://doi.org/10.2478/johh-2022-0013 |
| _version_ | 1818242735767814144 |
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| author | Gomes Ruan G.S. Gomes Guilherme J.C. Vargas Eurípedes A. van Genuchten Martinus Th. Pinto João T.M.G. Rosa Felipe A. |
| author_facet | Gomes Ruan G.S. Gomes Guilherme J.C. Vargas Eurípedes A. van Genuchten Martinus Th. Pinto João T.M.G. Rosa Felipe A. |
| author_sort | Gomes Ruan G.S. |
| collection | DOAJ |
| description | Field tests were carried out to estimate effective unsaturated soil hydraulic properties of layered residual soils in Rio de Janeiro, southeastern Brazil. Data of this type are important for understanding the initiation of rainstorm-induced soil landslides, which often occur in the state of Rio de Janeiro as well as other areas having similar geologic settings and climate conditions. Tests were carried out using a simplified field approach, referred to as the Monitored Infiltration Test, which requires only a tensiometer to measure pressure heads below the wetting front, triggered by flow from a Mariotte bottle which maintains a constant pressure at the top edge of the soil profile. The data can then be analyzed by numerical inversion using the HYDRUS-2D software package. The test is relatively fast since no steady-state flow conditions are needed, and versatile since the test can be carried out quickly on steep slopes with the help of a manual auger. Soil water retention and the unsaturated hydraulic conductivity functions were obtained for a range of young, mature and saprolitic residual soils. The effective hydraulic properties of the distinct residual soil layers can be quite large, reflecting a need to provide a careful analysis of field-scale hydraulic heterogeneity in geotechnical analyses. |
| first_indexed | 2024-12-12T13:49:58Z |
| format | Article |
| id | doaj.art-34bb5b7c8e6c491c8baae082af5e6e73 |
| institution | Directory Open Access Journal |
| issn | 1338-4333 |
| language | English |
| last_indexed | 2024-12-12T13:49:58Z |
| publishDate | 2022-06-01 |
| publisher | Sciendo |
| record_format | Article |
| series | Journal of Hydrology and Hydromechanics |
| spelling | doaj.art-34bb5b7c8e6c491c8baae082af5e6e732022-12-22T00:22:35ZengSciendoJournal of Hydrology and Hydromechanics1338-43332022-06-0170224425610.2478/johh-2022-0013Field-scale assessment of the unsaturated hydraulic properties of residual soils in southeastern BrazilGomes Ruan G.S.0Gomes Guilherme J.C.1Vargas Eurípedes A.2van Genuchten Martinus Th.3Pinto João T.M.G.4Rosa Felipe A.5Department of Environmental and Civil Engineering, Pontifical Catholic University of Rio de Janeiro, Brazil.Department of Environmental Engineering, Federal University of Ouro Preto, MG, Brazil.Department of Environmental and Civil Engineering, Pontifical Catholic University of Rio de Janeiro, Brazil.Department of Earth Sciences, Utrecht University, Netherlands.Department of Environmental and Civil Engineering, Pontifical Catholic University of Rio de Janeiro, Brazil.Department of Environmental and Civil Engineering, Pontifical Catholic University of Rio de Janeiro, Brazil.Field tests were carried out to estimate effective unsaturated soil hydraulic properties of layered residual soils in Rio de Janeiro, southeastern Brazil. Data of this type are important for understanding the initiation of rainstorm-induced soil landslides, which often occur in the state of Rio de Janeiro as well as other areas having similar geologic settings and climate conditions. Tests were carried out using a simplified field approach, referred to as the Monitored Infiltration Test, which requires only a tensiometer to measure pressure heads below the wetting front, triggered by flow from a Mariotte bottle which maintains a constant pressure at the top edge of the soil profile. The data can then be analyzed by numerical inversion using the HYDRUS-2D software package. The test is relatively fast since no steady-state flow conditions are needed, and versatile since the test can be carried out quickly on steep slopes with the help of a manual auger. Soil water retention and the unsaturated hydraulic conductivity functions were obtained for a range of young, mature and saprolitic residual soils. The effective hydraulic properties of the distinct residual soil layers can be quite large, reflecting a need to provide a careful analysis of field-scale hydraulic heterogeneity in geotechnical analyses.https://doi.org/10.2478/johh-2022-0013residual soilsunsaturated soil hydraulic propertiesfield infiltration testshydrus-2d |
| spellingShingle | Gomes Ruan G.S. Gomes Guilherme J.C. Vargas Eurípedes A. van Genuchten Martinus Th. Pinto João T.M.G. Rosa Felipe A. Field-scale assessment of the unsaturated hydraulic properties of residual soils in southeastern Brazil Journal of Hydrology and Hydromechanics residual soils unsaturated soil hydraulic properties field infiltration tests hydrus-2d |
| title | Field-scale assessment of the unsaturated hydraulic properties of residual soils in southeastern Brazil |
| title_full | Field-scale assessment of the unsaturated hydraulic properties of residual soils in southeastern Brazil |
| title_fullStr | Field-scale assessment of the unsaturated hydraulic properties of residual soils in southeastern Brazil |
| title_full_unstemmed | Field-scale assessment of the unsaturated hydraulic properties of residual soils in southeastern Brazil |
| title_short | Field-scale assessment of the unsaturated hydraulic properties of residual soils in southeastern Brazil |
| title_sort | field scale assessment of the unsaturated hydraulic properties of residual soils in southeastern brazil |
| topic | residual soils unsaturated soil hydraulic properties field infiltration tests hydrus-2d |
| url | https://doi.org/10.2478/johh-2022-0013 |
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