Preliminar stability assessment of the submarine slopes surrounding the Garrucha harbour area (SW Mediterranean)
34th International Association of Sedimentologists (IAS) Meeting of Sedimentology, Sedimentology to face societal challenges on risk, resources and record of the past, 10-13 September 2019, Rome.-- 1 page
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International Association of Sedimentologists
2019-09-10
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dig-icm-es-10261-2041772022-12-14T12:20:08Z Preliminar stability assessment of the submarine slopes surrounding the Garrucha harbour area (SW Mediterranean) Nespereira, José Casas, David Yenes, Mariano Monterrubio, Serafín López-González, Nieves Ercilla, Gemma Mata Campo, Maria Pilar Vázquez, Juan Tomás Bárcenas, Patricia Palomino, Desirée Casalbore, Daniele Martínez, Patricia Pérez, Norma Alonso, Belén Pato, Natalia 34th International Association of Sedimentologists (IAS) Meeting of Sedimentology, Sedimentology to face societal challenges on risk, resources and record of the past, 10-13 September 2019, Rome.-- 1 page The Garrucha harbour, located in the Gulf of Vera (SW Mediterranean) was built in the 30¿s of the 20th century, and in the last decades different expansion works have been carried out due to its increasing commercial activity. Due to this expansion, the infrastructure interacts with the Garrucha canyon head. The Garrucha canyon is a northern tributary of the Almanzora-Alías-Garrucha canyon system with its shallowest rim located close to the shore, at 7-20 meter water depth. The canyon is affected by sedimentary processes producing progressive entrenchment and retrogradation that may represents a potential hazard for the harbour.The aim of this work is to present a preliminary assessment of the submarine slopes stability in the surrounding area (2 km) of the harbour based on the results of limit equilibrium analysis carried out in six representative profiles, and the definition of the geotechnical units in the first 20 m of the seafloor. To do so, high resolution bathymetry, sediment sampling and in situ testing (7 CPTu) recently obtained in the framework of Fauces project have been used. Grain size analysis, Atterberg limits and oedometer, direct shear and triaxial tests allowed to define the geotechnical properties of sediments. The geotechnical characterization and the in situ tests (CPTu) allowed to define three geotechnical units (GU) in the area. GU 1, predominantly located in the harbour vicinity, is a granular and non-plastic sediment, with 75% of sand content and strength parameters defined by 27.1° effective friction angle (¿¿) and null effective cohesion (c¿). The second granular unit, GU 2, with a higher fine content (59 %) is a ML soil which shear strength is governed by an effective cohesion of 18.2 kPa and an effective friction angle of 26.4°. Finally, a cohesive normally consolidated GU 3 has been defined, with fine content > 90% and low plasticity. In these materials, undrained is the most suitable condition for stability analysis, and therefore, Su values from 20 to 100 kPa have been assigned according the CPTu and TUU tests. Slope stability analyses were carried out using limit equilibrium slope stability software, calculating the Factor of Safety (FS) with the Bishop simplified method. For the six profiles considered, and under static conditions, the FS obtained were higher than 1, but close to this value in the locations where GU 3 is present. For these particular profiles, non-equilibrium resulted when the seismic load for this area was taken into account. As a conclusion, the results obtained so far indicate the existence of a geological hazard associated with the generation of submarine landslides in the surrounding area of the Garrucha harbour considering a seismic activity context, and they would be preferently developed in locations where UG 3 appears. The nearest area to the harbour infrastructure, where granular materials predominate, is more stable; however, its granulometric nature points to potential liquefaction, and therefore, a more deep study about its dynamic behaviour is needed 2020-03-17T11:36:43Z 2020-03-17T11:36:43Z 2019-09-10 2020-03-17T11:36:43Z comunicación de congreso http://purl.org/coar/resource_type/c_5794 34th International Association of Sedimentologists Meeting of Sedimentology (2019) http://hdl.handle.net/10261/204177 Sí open International Association of Sedimentologists |
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34th International Association of Sedimentologists (IAS) Meeting of Sedimentology, Sedimentology to face societal challenges on risk, resources and record of the past, 10-13 September 2019, Rome.-- 1 page |
| format |
comunicación de congreso |
| author |
Nespereira, José Casas, David Yenes, Mariano Monterrubio, Serafín López-González, Nieves Ercilla, Gemma Mata Campo, Maria Pilar Vázquez, Juan Tomás Bárcenas, Patricia Palomino, Desirée Casalbore, Daniele Martínez, Patricia Pérez, Norma Alonso, Belén Pato, Natalia |
| spellingShingle |
Nespereira, José Casas, David Yenes, Mariano Monterrubio, Serafín López-González, Nieves Ercilla, Gemma Mata Campo, Maria Pilar Vázquez, Juan Tomás Bárcenas, Patricia Palomino, Desirée Casalbore, Daniele Martínez, Patricia Pérez, Norma Alonso, Belén Pato, Natalia Preliminar stability assessment of the submarine slopes surrounding the Garrucha harbour area (SW Mediterranean) |
| author_facet |
Nespereira, José Casas, David Yenes, Mariano Monterrubio, Serafín López-González, Nieves Ercilla, Gemma Mata Campo, Maria Pilar Vázquez, Juan Tomás Bárcenas, Patricia Palomino, Desirée Casalbore, Daniele Martínez, Patricia Pérez, Norma Alonso, Belén Pato, Natalia |
| author_sort |
Nespereira, José |
| title |
Preliminar stability assessment of the submarine slopes surrounding the Garrucha harbour area (SW Mediterranean) |
| title_short |
Preliminar stability assessment of the submarine slopes surrounding the Garrucha harbour area (SW Mediterranean) |
| title_full |
Preliminar stability assessment of the submarine slopes surrounding the Garrucha harbour area (SW Mediterranean) |
| title_fullStr |
Preliminar stability assessment of the submarine slopes surrounding the Garrucha harbour area (SW Mediterranean) |
| title_full_unstemmed |
Preliminar stability assessment of the submarine slopes surrounding the Garrucha harbour area (SW Mediterranean) |
| title_sort |
preliminar stability assessment of the submarine slopes surrounding the garrucha harbour area (sw mediterranean) |
| publisher |
International Association of Sedimentologists |
| publishDate |
2019-09-10 |
| url |
http://hdl.handle.net/10261/204177 |
| work_keys_str_mv |
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