https://cir.cenieh.es/handle/20.500.12136/19 Fri, 24 Jul 2026 22:53:44 GMT 2026-07-24T22:53:44Z https://cir.cenieh.es/handle/20.500.12136/3482 Title: Superficies de erosión y denudación durante el Cenozoico en el Geoparque Mundial de la UNESCO Las Loras (cordillera Cantábrica, Burgos-Palencia) Authors: Benito-Calvo, Alfonso; Martínez-Fernández, Adrián; Moreno García, Davinia; Chicote Cuesta, Ángela Abstract: En este estudio se han analizado las superficies de erosión en el Geoparque Mundial de la UNESCO Las Loras (Burgos- Palencia), situado en el pedimento centro-meridional de la cordillera Cantábrica que enlaza con la cuenca del Duero. Este estudio, dirigido a estudiar las fases de denudación cenozoicas preservadas en los sinclinales aplanados y colgados que integran las loras, se ha basado en la cartografía geomorfológica a partir de trabajo de campo y la interpretación de cartografías digitales. Las superficies identificadas forman una secuencia de 8 niveles (S1-S8). El arrasamiento más antiguo S1, posiblemente de edad Paleoceno, podría estar relacionado con la base de la macro-secuencia estratigráfica paleógena de La Ojeda, que registró las primeras erosiones continentales justo tras el levantamiento de la secuencia marina del Cretácico superior por el inicio de la compresión alpina. Posteriormente, durante la compresión alpina principal (Eoceno y el Oligoceno superior) se debieron producir como mínimo otras cuatro reactivaciones del relieve que dieron lugar a la formación de las superficies de erosión S2-S5. Estas fases de desmantelamiento del relieve habrían quedado registradas en el tramo superior de la macrosecuencia paleógena, formada por potentes depósitos aluviales acumulados en las pequeñas cuencas de antepaís que marcaron los estadios iniciales de la cuenca del Duero. La última superficie paleógena en relación con la compresión principal pudo ser la superficie S5 (Oligoceno-Mioceno inferior). Entre los arrasamientos ya plenamente neógenos, destaca la superficie de mayor extensión, S6, que presenta una conexión directa con los abanicos aluviales de la formación Alar del Rey (Astaraciense, Mioceno medio), y está deformada por una fase tectónica al final del Mioceno medio que causó la reactivación del frente cantábrico. Las superficies más recientes, S7 y S8, forman planos menores que enrasan con unidades siliciclásticas de piedemonte, las cuales representarían, respectivamente, las fases de colmatación (Turoliense, Mioceno superior) y primer vaciado (Plioceno) de la cuenca del Duero. Sun, 01 Jun 2025 00:00:00 GMT https://cir.cenieh.es/handle/20.500.12136/3482 2025-06-01T00:00:00Z https://cir.cenieh.es/handle/20.500.12136/3291 Title: Terrestrial laser scanner versus ground-based structure from motionphotogrammetry for sinkhole characterization and monitoring in an urban area. A comparative assessment in the evaporite Karst of Zaragoza city, Ne Spain Authors: Sevil, Jorge; Gutiérrez, Francisco; Benito-Calvo, Alfonso Abstract: Delimiting, characterizing, and monitoring active sinkholes in urban areas are fundamental steps for effectively managing the associated risks. These high-exposure scenarios require accurate data on hazard parameters (e.g., spatially-distributed subsidence rates), but the current investigation and monitoring techniques for sinkholes remain relatively undeveloped in comparison to other geological hazards, such as landslides. In this regard, we present the first comparative analysis of the performance of Terrestrial Laser Scanner (TLS) and ground-based Structure from Motion (SfM) photogrammetry for delimiting the actively deforming areas and characterizing the spatial patterns of ground displacement through the comparison of two pairs of high-resolution 3D point clouds. To assess their performance this work utilizes vertical displacement data measured by high-precision leveling. The main finding is that, despite TLS provides displacement data with less noise and internal distortion, the less expensive and easier-to-implement SfM photogrammetry using ground-based conventional cameras yields a comparable performance when accurate geodetic data is available. However, according to high-precision leveling data, both techniques may underestimate the extent and rate of the deformation, indicating that there is still the need to complement these high-resolution techniques with the use of high-precision methods such as leveling or additional geodetic benchmarks. Mon, 01 Jan 2024 00:00:00 GMT https://cir.cenieh.es/handle/20.500.12136/3291 2024-01-01T00:00:00Z https://cir.cenieh.es/handle/20.500.12136/3050 Title: The final countdown? Monitoring the rapid shrinkage of the Maladeta glacier (2010–2020), Southern Pyrenees Authors: Martínez-Fernández, Adrián; Serrano Cañadas, Enrique; Sanjosé Blasco, José Juan de; Gómez-Lende, Manuel; Sánchez-Fernández, Manuel; López-Moreno, J. Ignacio; Rico, Ibai; Pisabarro, Alfonso Abstract: Small glaciers are one of the best indicators of climatic variations and their short-term effects. Located in the Spanish Pyrenees, the Maladeta is one of these glaciers. Its systematic observation began in the 1980s, being one of the few Pyrenean glaciers with a tongue-shaped front. This study presents the evolution of the Maladeta glacial tongue over a decade (2010–2020) through multiple geomatic techniques. Surveys have ranged from Total Stations and Global Navigation Satellite System devices to massive data capture techniques such as Terrestrial Laser Scanners or Unmanned Aerial Vehicles photogrammetry. The aim is to analyze in detail the loss of surface area and thickness of the glacier and its transition from being a glacier with a tongue partially determined by climate to a topoclimatically determined cirque glacier. The results reveal a tongue retreat of over 5 m/yr and area losses of over 0.2 ha/yr, along with ice thickness and volume losses of −1.7 m/yr and over −21 × 103 m3/yr, respectively. If this trend continues, the tongue, and possibly the Maladeta glacier, could disappear by the end of the 2030s. Fri, 01 Dec 2023 00:00:00 GMT https://cir.cenieh.es/handle/20.500.12136/3050 2023-12-01T00:00:00Z https://cir.cenieh.es/handle/20.500.12136/3038 Title: Reconstructing depositional environments through cave interior facies: The case of Galería Complex (Sierra de Atapuerca, Spain) Authors: Campaña Lozano, Isidoro; Benito-Calvo, Alfonso; Pérez-González, Alfredo; Ortega Martínez, Ana Isabel; Álvaro Gallo, Ana; Miguens Rodríguez, Leticia; Iglesias Cibanal, Javier; Bermúdez de Castro, José María; Carbonell, Eudald Abstract: This work showed that cave sediments are useful for geomorphologic studies and for reconstructing depositional environments. While the cave entrance facies have been extensively studied for their relationship with the fossil and archaeological record, the cave interior facies have received much less attention, although they can provide much information on the geomorphological evolution of the karst. This work presents the stratigraphic and sedimentological study of a section >6 m thick and 10 m long of cave interior sediments of Galería Complex (Sierra de Atapuerca, Spain). Galería Complex is a cavity infill of the Sierra de Atapuerca (Spain), composed of three sections filled by at least 30 m of Pleistocene sediments. This sequence is divided into 5 lithostratigraphic units named from bottom to top: GI – GV. GI unit is 19 m thick of interior facies in the base of the Galería Complex, divided into two sub-unit, GIa and GIb, by the Matuyama-Bruhnes paleomagnetic boundary. GI unit shows an issue with the chronology since has uncoherent between TT-OSL and ESR/U-series and paleomagnetism dates. This work has been done by combining field observation with laboratory sedimentary analysis to characterize the texture and structure of the sediments. Based on these studies, 12 layers and 9 sedimentary facies have been identified. The facies associations indicate a clear separation between GIa and GIb sub-units. GIa sub-unit is dominated by epiphreatic conditions and represents continuous relativity sedimentation during the Early Pleistocene; meanwhile, GIb shows important erosion events and facies with reworked materials that indicate vadose conditions during the Middle Pleistocene. This environmental change is related to the geomorphological evolution of the Arlanzón River. In addition, soft-sediment deformation structures have been described, including faults and low-angle folds. An important leaching process has been identified by the presence of phosphates that could explain the underestimated ages obtained in other works. Wed, 01 Nov 2023 00:00:00 GMT https://cir.cenieh.es/handle/20.500.12136/3038 2023-11-01T00:00:00Z