108 research outputs found

    Evaluation of Susceptibility by Mass Movements through Stochastic and Statistical Methods for a Region of Bucaramanga, Colombia

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    Mass movements are one of the hydrometeorological phenomena with the most negative impacts on the study area, and their evaluation through the calculation of susceptibility provides a tool of vital importance within territorial planning and disaster risk management on natural and anthropic environments. Their evaluation took algorithms designed within stochastic and statistical methods, such as the artificial neural network, the bivariate statistical method, and the logistic regression method, which integrate inherent variables (geoenvironmental characterization) against events or dependent variables. This correlation simulates regions with a probability of occurrence of mass movement under training or weight assignment. Its construction for this study took, as a basis, 50% of the events (test) and 50% of the events (validation) randomly and with equivalent area distribution against the inherent variables. As a result, it was observed that the bivariate method presented a good performance in spatial prediction. This model presents values of AUC = 82.2% (test) and AUC = 76.9% (validation), grouping a total of 591 events of the 856 events in the high category (69%). In turn, from a second evaluation carried out by this method to each hydrographic basin, a condition was established in the area (50 km2) for coherent results at a level of analysis 1:25,000, based on the idea that the variables do not present changes greater than 20% in their attributes, added to a knowledge of the area evaluated

    Augmented Reality as a Tool for Promoting the Tourist Value of the Geological Heritage Around Natural Filming Locations: a Case Study in “Sad Hill” (The Good, the Bad and the Ugly Movie, Burgos, Spain)

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    This research was funded by projects Junta Castilla y Leon SA044G18, University of Salamanca USAL2017/46AC01, and Spanish Ministry of Economy and Competitiveness CGL2015-69919-R.Some natural scenes of films shooting contain landscapes and other elements that are part of the geological heritage, representing an added value for the growing cultural tourism that visits them. In the SE of Burgos province (Spain), near some filming locations of the classic western movie directed by Sergio Leone (1966), “The Good, the Bad and the Ugly”, we have assessed the Geological Heritage of 6 selected sites: (1) Dinosaur tracks; (2) Paleo-river structures preserved; (3) Fossil trees; (4) Sad Hill; (5) Marine Cretaceous fossils; and (6) La Yecla Gorge. Their tourist-cultural, scientific and educational values range from 775 points in La Yecla Gorge site to 450 in Marine Cretaceous fossils site. A virtual tour is presented implementing Augmented Reality on Google Earth with detailed but easily understanding descriptive information of each site, suggested activities for tourism and a free geoapp. The proposed technologies can enhance geotourism, favouring sustainable development and fostering attitudes and skills related to the tourist’s respect for nature.publishersversionpublishe

    The evolution of minimum mortality temperatures as an indicator of heat adaptation: The cases of Madrid and Seville (Spain)

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    The increase in the frequency and intensity of heat waves is one of the most unquestionable effects of climate change. Therefore, the progressive increase in maximum temperatures will have a clear incidence on the increase in mortality, especially in countries that are vulnerable due to geographical location or their socioeconomic characteristics. Different research studies show that the mortality attributable to heat is decreasing globally, and research is centred on future scenarios. One way of detecting the existence of a lesser impact of heat is through the increase in the so-called temperature of minimum mortality (TMM). The objective of this study is to determine the temporal evolution of TMM in two Spanish provinces (Seville and Madrid) during the 1983–2018 period and to evaluate whether the rate of adaptation to heat is appropriate

    La “Ruta de las huellas fósiles” (Monsagro, Salamanca): un ejemplo de iniciativa geoturística aplicada al desarrollo rural

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    Se presenta la “Ruta de las huellas fósiles”, realizada en el casco urbano de Monsagro (Sierra de Francia, Salamanca). Mediante seis paneles didácticos e interpretativos, que incluyen el acceso “online” desde las nuevas tecnologías (smartphone, tablets, ipod….) a información complementaria implementada en videos, códigos QR, geoapps y juegos, se han promocionado y divulgado los contenidos geológicos de la zona, basados principalmente en el interés paleontológico de sus icnofósiles, atribuidos a diversos tipos de gusanos y trilobites durante el Ordovícico Inferior, y en el interés geomorfológico de sus cresterías cuarcíticas con relieve apalachiense, del encajamiento fluvial del río Agadón y de sus formaciones superficiales como canchales. Los visitantes señalan como fortalezas de la ruta su fácil y didáctico recorrido, así como la implicación ciudadana en la conservación de las icnitas

    Hydrogeology of the Lagunas de Villafáfila area (Zamora)

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    Las Lagunas de Villafáfila constituyen un enclave natural en el valle del río Salado caracterizado por aguas con conductividades eléctricas entre 4000 y 5000 µS/cm). La piezometría elaborada en la zona revela el aporte de la recarga de las laderas que rodean las lagunas y el bajo gradiente hidráulico que existe en las zonas llanas perilagunares. El análisis físico-químico del agua de las lagunas y de las aguas subterráneas del entorno ha permitido caracterizar tres hidrofacies químicas: 1) bicarbonatada cálcico-magnésica; 2) clorurado-sódica; y 3) bicarbonatada clorurado-sódica. Estas representan respectivamente aguas recargadas en las vertientes de las lagunas, flujos profundos de largo recorrido que descargan en las lagunas, y mezcla de ambas. Las lagunas resultan de la mezcla de aguas con diferentes orígenes: aguas de lluvia + aguas de escorrentía + aguas de flujos locales + flujos regionales profundos + reciclado de salmueras. Las aguas cloruradas sódicas podrían procecer de la disolución de evaporitas de los relieves septentrionales de la Cordillera Cantabrica y/o de evaporitas situadas en el subsuelo desde esta Cordillera hasta el entorno de las lagunasVillafáfila lakes are natural lakes with electric conductivities between 4000-5000 µS/cm located in the valley of the Salado river. The piezometry of the area suggest that the hills surrounding the lakes are local recharge areas while the lakes and their surroundings around the lakes are discharge zones with low hydraulic gradient. Physico-chemical analyses of lake and groundwaters have allowed characterizing three hydrochemical facies: 1) calcium magnesium bicarbonate; 2) sodium chloride ; and 3) sodium bicarbonate-chloride waters. These hydrofacies record respectively, the local recharges of the surrounding hills, long and deep flow-paths discharging into the lakes, and a mix of the above. Villafálila lake waters are the result of a mixing of rain + runoff + local flows + regional deep flows + brine recycling. Sodium chloride waters could come from the dissolution of evaporites in the Cantabrian Mountains and/or from evaporites located in somewhere between these Mountains and the Villafáfila lake
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