Academic Journal
Hydrological control of soil thickness spatial variability on the initiation of rainfall-induced shallow landslides using a three-dimensional model
| العنوان: | Hydrological control of soil thickness spatial variability on the initiation of rainfall-induced shallow landslides using a three-dimensional model |
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| المؤلفون: | Tufano R., Formetta G., Calcaterra D., De Vita P. |
| المساهمون: | Tufano, R., Formetta, G., Calcaterra, D., De Vita, P. |
| سنة النشر: | 2021 |
| المجموعة: | IRIS Università degli Studi di Napoli Federico II |
| مصطلحات موضوعية: | Distributed hydrological modelling, Probability of failure, Rainfall threshold, Shallow landslide, Soil thickness |
| الوصف: | Thickness and stratigraphic settings of soils covering slopes potentially control susceptibility to initiation of rainfall-induced shallow landslides due to their local effect on slope hydrological response. Notwithstanding the relevance of the assessment of hazard to shallow landsliding at a distributed scale by approaches based on a coupled modelling of slope hydrological response and slope stability, the spatial variability of soil thickness and stratigraphic settings are factors poorly considered in the literature. Under these premises, this paper advances the well-known case study of rainfall-induced shallow landslides involving ash-fall pyroclastic soils covering the peri-Vesuvian mountains (Campania, southern Italy). In such a unique geomorphological setting, the soil covering is formed by alternating loose ash-fall pyroclastic deposits and paleosols, with high contrasts in hydraulic conductivity and total thickness decreasing as the slope angle increases, thus leading to the establishment of lateral flow and an increase of pore water pressure in localised sectors of the slope where soil horizon thickness is less. In particular, we investigate the effects, on hillslope hydrological regime and slope stability, of irregular bedrock topography, spatial variability of soil thickness and vertical hydraulic heterogeneity of soil horizons, by using a coupled three-dimensional hydrological and a probabilistic infinite slope stability model. The modelling is applied on a sample mountain catchment, located on Sarno Mountains (Campania, southern Italy), and calibrated using physics-based rainfall thresholds derived from the literature. The results obtained under five simulated constant rainfall intensities (2.5, 5, 10, 20 and 40 mm h−1) show an increase of soil pressure head and major failure probability corresponding to stratigraphic and morphological discontinuities, where a soil thickness reduction occurs. The outcomes obtained from modelling match the hypothesis of the formation of lateral throughflow due to the ... |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| Relation: | info:eu-repo/semantics/altIdentifier/wos/WOS:000652953200002; numberofpages:14; journal:LANDSLIDES; http://hdl.handle.net/11588/854277; info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85106408344; https://link.springer.com/article/10.1007/s10346-021-01681-x |
| DOI: | 10.1007/s10346-021-01681-x |
| الاتاحة: | http://hdl.handle.net/11588/854277 https://doi.org/10.1007/s10346-021-01681-x https://link.springer.com/article/10.1007/s10346-021-01681-x |
| Rights: | info:eu-repo/semantics/openAccess |
| رقم الانضمام: | edsbas.71F823D0 |
| قاعدة البيانات: | BASE |
| DOI: | 10.1007/s10346-021-01681-x |
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