Geometrical and geotechnical characterization of the earth fissures appeared in the Guadalentín Valley (southeastern Spain) after the September 2012 flooding

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Title: Geometrical and geotechnical characterization of the earth fissures appeared in the Guadalentín Valley (southeastern Spain) after the September 2012 flooding
Authors: Pastor Navarro, José Luis | Mulas de la Peña, Joaquín | Tomás, Roberto | Herrera García, Gerardo | Fernández-Merodo, José Antonio | Béjar Pizarro, Marta | Jordá Bordehore, Luis | García López-Davalillos, Juan Carlos | Aragón, Ramón | Mateos, Rosa María
Research Group/s: Ingeniería del Terreno y sus Estructuras (InTerEs)
Center, Department or Service: Universidad de Alicante. Departamento de Ingeniería Civil
Keywords: Earth fissures | Guadalentín Valley | Murcia province | Flooding
Knowledge Area: Ingeniería del Terreno
Issue Date: 22-Apr-2020
Publisher: Copernicus Publications
Citation: Proceedings of the International Association of Hydrological Sciences. 2020, 382: 663-667. doi:10.5194/piahs-382-663-2020
Abstract: Two earth fissures appeared in Murcia province (southeastern Spain) after the flood occurred because of a heavy downpour on 28 September 2012. In this area, located within the Guadalentín Valley, up to 212 L m−2 was reported that day. More than 200 agricultural exploitations were destroyed by the flooding, with a devastating effect on many infrastructures, such as a main A-7 highway bridge that collapsed in this event. The earth fissures appeared after this flooding in the towns of Puerto Lumbreras and Totana. The first fissure showed a straight-line direction approximately parallel to the main geological structures of the Guadalentín Valley. The total length of the fissure was 400 m and was 2 to 3 m in depth. The soil in the fissure is classified as a low-plasticity silt with some sand and clay, ML, according to the Unified Soil Classification System. From the sieve and hydrometer tests, the percentage of silt in these samples was between 48 % and 68 %, the clay content between 12 % and 30 % and the sand content between 2 % and 40 %. The plasticity index was smaller than 9.2 for all the samples. To evaluate the piping and internal erosion susceptibility of the soil, pinhole, crumb and geochemical tests were done on the collected samples. A result of non-dispersive soil was obtained from crumb and pinhole tests. Nevertheless, the pH, sodium adsorption ratio and exchangeable sodium percentage tests showed that some samples could be affected by the dispersion of the soil. Also, the collapsible potential of the soil was studied, showing negative results for all the samples except for that collected at the southern end of the fissure, which showed a medium to high potential. Concerning the Totana fissure, it appeared with different branches and holes instead of as a rectilinear pattern. The total length of the fissure was 190 m, with the soil characterized as a silty soil. Lastly, INSAR data, GPS, GPR and land subsidence maps were used to study the possible origin of these fissures.
Sponsor: This research has been supported by the Spanish Ministry of Economy and Competitiveness, the State Agency of Research and the European Funds for Regional Development (grant no. TEC2017-85244-C2-1-P), UNESCO (grant no. ICGP641), the Universidad de Alicante (grant no. GRE17-11), and the Universidad de Alicante (grant no. GRE18-15).
ISSN: 2199-899X
DOI: 10.5194/piahs-382-663-2020
Language: eng
Type: info:eu-repo/semantics/article
Rights: © Author(s) 2020. This work is distributed under the Creative Commons Attribution 4.0 License.
Peer Review: si
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Appears in Collections:INV - INTERES - Artículos de Revistas

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