Examinando por Autor "Mejía Ávila, Doris"
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Publicación Acceso abierto Análisis de la variación de la superfice del complejo cenagoso del bajo Sinú para las temporadas estacionales del año 2021 a partir de imágenes satelitales planetscope(2023-08-01) Payares Narváez, Fabián Enrique; Mejía Ávila, Doris; Martínez Lara , ZorayaThe degradation of wetlands impacts the ecosystem services they provide, especially the capacity for water regulation and flood control, which is considered by Ricaurte, et al. (2017) as one of the most important services provided by these ecosystems. As a result of this problem, studies have been carried out in the aforementioned ecosystems, in order to know the location of wetlands and support land-use planning and disaster prevention policies in the departments and municipalities of the country (Patiño, 2016). As a consequence of the degradation suffered by these ecosystems in Colombia and the lack of an updated and accurate inventory, several authors agree that the delimitation at a precise and detailed scale of wetlands is a fundamental and necessary tool to establish strategies for the preservation, protection and conservation of their ecosystem services; especially for the preservation of their water regulation conditions (Baker, C. et al., 2006), (Brena, Castillo, and Wagner, 2016), (Patiño, 2016). Therefore, the general objective of this work is to know the spatial variation of the Bajo Sinú Cenotage Complex during its seasonal periods for the year 2021. The methodology employs the use of PlanetScope satellite images through spectral indices, with the purpose of establishing a categorization of the spectral ranges of the different analysis coverages present in the Lower Sinú swamp complex and, in this way, to verify the individualization capacity of these study classes. In response to the methodology used and the results obtained, it was possible to generate a cartography of the different coverages associated to the CCBS at a higher level of detail than the one usually used (1:10 000), as well as the calculation of the total areas of the wetlands corresponding to the complex, including their floating aquatic vegetation coverages.Publicación Acceso abierto Análisis evolutivo del crecimiento y desarrollo del programa de Ingeniería Ambiental de la Universidad de Córdoba, período 2018-2023(Universidad de Córdoba, 2024-04-05) Hernández Miranda, Keren María; Cantero Benítez, Mónica Cecilia; Mejía Ávila, Doris; Barreto López, Liliana Enith; Bustamante Ruiz, Angélica del CarmenEl informe de análisis evolutivo del crecimiento y desarrollo del programa de Ingeniería Ambiental (2018-2023) de la Universidad de Córdoba destaca el progreso y fortalecimiento en los ejes de docencia, investigación y extensión, con la finalidad de mejorar los procesos de autoevaluación y acreditación. Se evidencia un aumento significativo en el número y calidad de docentes, así como una mejora en la relación docente/estudiante. En cuanto a la investigación, el Grupo de Investigación en Modelación y Evaluación de Sistemas Ambientales (GIMESA) mantiene su categorización (B) en Minciencias y ha aumentado la producción de artículos científicos. La sección de extensión colabora con empresas y entidades externas, ofreciendo oportunidades para los estudiantes. La percepción sobre la calidad del programa es positiva tanto por parte de estudiantes como de docentes, destacando la importancia de contar con docentes altamente calificados y una enseñanza de calidad para preparar a los estudiantes para los desafíos del mundo moderno.Publicación Acceso abierto Caracterización geomorfológica del sistema volcánico sedimentario en la zona noreste de La Lorenza-Córdoba(2021-09-22) Pernett Suarez, Daniel; Villegas Sánchez, Maira; Mejía Ávila, DorisThis study allowed the characterization of the major exponents of sedimentary volcanism in Canalete; San Diego mud volcano and El Palmar mud volcano, through the interpretation of UAV photographs and satellite images and field reconnaissance, based on the geomorphological hierarchy of these two volcanoes, we found among the main components, mud deposits, faucets, salsa lakes in the sedimentary volcanic environment (vl) and components such as minor erosion escarpment, minor erosion scarp and minor erosion scarp, salsa lakes in the Sedimentary Volcanic environment (vl) and components such as minor erosion scarp, fault scarp and solifluxion lobes in the Denudational Structural environment (Sd), it was defined in these volcanoes according to the classification of Mazzini and Ethiopian (2017), the form of plateau for San Diego and dome for Palmar. Similarly, based on the analysis of the dynamics of these components, it was defined that the greatest threat from volcanism is related to the expulsion of consolidated material, mud flows and the erosive processes they bring, which generate a greater threat to the inhabitants of the Casa Tabla farm, which are located at a distance of at least 400 meters from the San Diego volcano, for the case of Palmar, the threat is directed to the road structure that is only meters away from the volcano.Publicación Acceso abierto Caracterización geomorfológica e identificación de las geo amenazas por volcanismo sedimentario en el sector occidental del volcán San Diego, Canalete, Colombia(2021-09-28) Barros de la Espriella, María Carolina; Martínez Lara, Zoraya Yasquine; Mejía Ávila, DorisIn the municipality of Canalete - Córdoba, in the village of La Lorenza, there is an important sedimentary volcanic system made up of volcanoes such as Palmar and San Diego, the western sector of the San Diego volcano being considered as the study area in the present investigation, the main objective of the study was to characterize the geomorphological features of the sector in order to provide information that favors the identification of threats due to sedimentary volcanism, this objective was achieved through the interpretation and analysis of UAV photographs by means of GIS in conjunction with field control. ; This project was worked on at a scale of 1: 500, managing to detail as many geoforms as possible in the studied area, within which taps, sauces, pools and multicrater leaks were found that could be correlated with different types of threat, thus allowing to determine that the San Diego mud volcano area studied is associated with mud gap and flow ejection threats and fires.Publicación Acceso abierto Caracterización geomorfológica y correlación con el tipo de amenazas por volcanismo sedimentario, sector suroriental del volcán San Diego(2021-09-28) Herazo Romero, Miguel Antonio; Torregrosa Olivera, Eliana Judith; Martínez Lara, Zoraya Yasquine; Mejía Ávila, DorisThe San Diego mud volcano is located in Canalete, Córdoba, the object of this research, which aims to characterize the present geoforms. Leaks such as gryphons (splatters , bubblers , clast-rich,and extintic), sauces, and pools, deposits such as flows (old and recent) were found. The characterization of these geoforms was carried out by means of images taken through drones and field visits, thus obtaining a geomorphological cartography at a scale of 1: 500, managing to determine the largest number of geoforms in the study area to make a correlation between them and the occurrence of possible threats, It was established that splatters gryphons are associated with fire threats due to the amount of gases that they expel to the surface, bubblers gryphons and sauces were related to threats due to expulsion of mud and clastic taps to threats due to expulsion of a mud gap.Publicación Acceso abierto Identificación de la huella dejada por la minería de oro en un sector de la cuenca del río San Jorge para el periodo 2010-2020, a partir del uso de imágenes satelitales de media y alta resolución(2022-11-18) Sánchez López, Anyis Caterine; Mejía Ávila, DorisA study of the footprint left by gold mining was carried out through a multitemporal analysis of the upper and lower (middle) basin of the San Jorge River, located in the northernmost area, of the South American plate in the jurisdiction of the departments of Antioquia and Cordova. The evaluation period of the analysis was 10 years, between 2010 and 2020. The general objective of this research work was to identify the footprint left by open-pit gold mining in a sector of the San Jorge river basin for the period 2010 -2020, through the visual interpretation of medium and highresolution images. For which, different geoprocessing tools and cartographic processes were implemented such as photointerpretation, treatment and analysis of satellite images such as Rapid Eye, PlanetScope, Landsat 7 and Sentinel 2, using the Qgis and ArcMap software. This study determined that in the period 2010-2020 there was a mining footprint of 9.429,057 hectares (ha) in the area under study. The low-medium account of the San Jorge River was the most affected with 8451.55 hectares (ha), especially the sub-basin of the Ciénaga de Ayapel with an intervened area of 7197.81 ha, which implies that at least 18 % of its territory has been in contact with gold mining, highlighting the micro-basins; Monteadero, Escobilla, Trejos, Quebradona and Popales. On the other hand, this work shows that at a general level the period with the greatest growth dynamics was 2010-2015, on the contrary, the 2015-2020 period showed greater stability in the growth of the areas affected by said activity.Publicación Acceso abierto Potencialidad de las imágenes planetscope para diferenciar vegetación en ecosistemas cenagosos tropicales caso de aplicación: sector ciénaga guartinaja del complejo cenagoso del bajo Sinú(2023-08-30) Florez Alcala, Julio Cesar; Mejía Ávila, Doris; Martínez Lara, Zoraya YasquineEste trabajo de investigación busca evaluar la potencialidad de las imágenes de alta resolución espacial y temporal generadas por la constelación PlanetScope para diferenciar tipos de cobertura vegetal en el ecosistema cenagoso tropical Ciénaga Guartinaja, para ello se realizaron dos muestreos en campo en periodos de nivel de aguas medias y aguas bajas, que permitan obtener información primaria de las coberturas vegetales presentes en la ciénaga. Se extrajo de literatura científica un conjunto de 50 índices de vegetación, el cual se sometió a un análisis de separabilidad con el estadístico de distancia euclidiana para reducirlo a 20 índices. La selección de él o los mejores índices se realizó a partir del método para evaluación de la eficiencia de índices espectrales para el mapeo de ciénagas tropicales – SIA_WM. Los índices SAVI (L 0.5) y EVI fueron los mejor calificados, por tanto, a partir de estos se construyó la cartografía de la Ciénaga Guartinaja para las dos temporadas estacionales: seca y húmeda. Por otra parte, la aplicación de SIA_WM permitió separar coberturas como el espejo de agua, la vegetación y la superficie terrestre, sin embargo, no fue posible separar las coberturas de buchón, de guandú y de hierba de arroz.Publicación Restringido Presencia de microplásticos en la ciénaga Guartinaja, complejo cenagoso del Bajo Sinú(2023-08-08) Begambre González, Fernando José; Cifuentes Montt, Valentina; Mejía Ávila, Doris; Herazo Cárdenas, DianaMicroplastic pollution in freshwater ecosystems is attracting the attention of researchers around the world. These materials have the ability to persist in the environment for long periods of time, generating accumulations that can last for thousands of years, becoming an emerging pollutant that requires study. The objective of this research was to evaluate the presence of microplastics in the water of the Ciénaga Guartinaja through field sampling and laboratory methods. For this, water samples were taken at 20 selected points distributed randomly throughout the Ciénaga. The microplastics were extracted by the filtration method, the particles were counted and classified by visual inspection. In total, a concentration of 13.39 Mps/L was found with an average for the swamp of 0.669 MPs/L, fibers were the most found form of microplastics followed by microspheres, films, foams, and fragments. With the data obtained, three interpolation methods (IDW, Spline and Natural Neighbor) were evaluated to generate concentration prediction surfaces, which would allow visualizing and analyzing spatial patterns of the variable in question.Publicación Acceso abierto Valoración socio-cultural de los servicios ecosistémicos en dos cuerpos cenagosos del departamento de Córdoba- Colombia(2022-06-01) Lobo Cabeza, Sonia Carolina; López Díaz, Carolina; Soto Barrera, Viviana Paola; Mejía Ávila, DorisWetlands are full of life, but at the same time threatened by multiple anthropic factors. These ecosystems interact with various communities present in the territories through the provision of ecosystem services. The objective of this study is to assess the social values present in two wetlands in the department of Córdoba, such as the Bajo Sinú Marsh Complex (BS) and the Betancí Swamp (BT), according to the importance that the community and experts have of the services they provide. In the first place, an environmental characterization of the study areas was carried out, covering the biophysical and social dimensions, later the different services provided by the ecosystems were identified, which were valued through qualitative tools such as semistructured surveys, as well as their intensity and intensity. use. 195 surveys were obtained, where the results show that for the communities of the two complexes the most important ecosystem services are cultural (BT: 39.3%; BS: 35.86%), regulation (BT: 31.1%; BS: 33.72%) and finally those of supply (BT 29.6%; BS: 30.42%), while for the experts in first place go those of regulation (36.3%), followed by cultural (35.1%) and finally supply (28.6%). Although societies exhibit interdependence and continuous interactions with these ecosystems, they are little taken into account in management and decision-making. The results form a base of knowledge necessary for the analysis of the use and exploitation of services, as well as to develop guidelines for the sustainable management of the resources provided by these wetlands.