| Journal: | Investigaciones geográficas - Instituto de Geografía. UNAM |
| Database: | PERIÓDICA |
| System number: | 000408360 |
| ISSN: | 0188-4611 |
| Authors: | Núñez Ravelo, Franklin Antonio1 |
| Institutions: | 1Universidad Pedagógica Experimental Libertador, Instituto Pedagógico de Caracas, Caracas, Distrito Federal. Venezuela |
| Year: | 2017 |
| Season: | Abr |
| Number: | 92 |
| Pages: | 2-18 |
| Country: | México |
| Language: | Español |
| Document type: | Artículo |
| Approach: | Analítico, descriptivo |
| Spanish abstract | El área de estudio se ubica en la costa al suroeste de Araya en el Estado Sucre, entre los 10° 33’30’’ N, 10°33’59” N y 64°15’32’’ O, 64°15’36’’ O, la cual se encuentra afectada por procesos erosivos que impactan a los pobladores que allí se asientan. La investigación se centró en analizar los procesos geomorfológicos que allí tiene lugar, basada en un modelo de campo con diseño no experimental, en niveles descriptivo y explicativo, operacionalizado en tres fases: a) campo, b) análisis de imágenes y c) laboratorio. El acantilado afectado por la erosión retrograda tipo cárcavas está constituido por un material franco-limoso cuyo análisis de rocas totales muestra una abundancia de arcillas (52%), oxido de silicio (28%), carbonato de calcio (18%), plagioclasas (5%), sulfuro de hierro (5%) y carbonato de hierro (2%); por su parte, el análisis de arcillas en fracción menor a dos micras muestra como predominantes: la caolinita (47%), ilita (39%), clorita (14%) y esméctita (1%). Se trata de un regolito dispersivo, con muy bajo contenido de MO, que favorece la ocurrencia de corriente de derrubio, suelo y desplome de la roca, detonado posiblemente a partir del leve incremento en las precipitaciones registradas entre julio y noviembre, así como las fuertes pendientes del terreno, lo que ha generado un retroceso del contorno apical estimado en 1.31 m*año−1 |
| English abstract | The study area is located in the south-west coast of Araya in Sucre State, between 10° 33’30’’ N , 10°33’59’’ N y 64°15’32’’ W, 64°15’36’’ W, which it is affected by erosion processes impacting the population center that sits there. Hence the research is to analyze the geomorphological processes developed, based on a model no-experimental and design field, in descriptive and explanatory levels, operationalized in three phases: a) field, to collect 21 samples of surface sediment (0-20 cm) distributed in 12 samples in the first badlands and 9 samples in the second and lift the morphometry of these landforms erosion; (b) image analysis, three stages such as the development of thematic maps from the Topographical maps of Cumana, Geological Araya Peninsula and The Cadastral Charter covered: Punta Caracare; followed by drawing sketches of gullies, from the data collected in the field, refer to height, length and width of the land. Corresponding to the last two variables data were corrected by the equation suggested by Wolf and Ghilani (2008), for data collected on slopes using measuring tape; and finally drawing the sketch of the apical cliff line drawn from the interpretation of the captured images of Google Earth for the years 2003, 2006, 2009 and 2011, based on the proposal of Soriano (2009) and (c) laboratory, to analyze the comportamientode physical properties such as: hygroscopic water content, determined by gravimetric method, based on the arguments presented by Rivera, et al. (2006) and Toledo (2009); size distribution of the particles (Method Bouyoucos) following the protocol reported by Lara (1985); Percentage of dispersion and soil (double hydrometer method) based on the specifications referred by porters and Alva (1999). As for the chemical-mineralogical properties, it was determined from 10 samples analysis of total rocks and clay mineralogy, for both analyzes samples were |
| Disciplines: | Geografía |
| Keyword: | Geografía física, Cárcavas, Geomorfología, Sedimentología, Erosión, Araya, Sucre, Venezuela |
| Keyword: | Geography, Physical geography, Gullies, Geomorphology, Sedimentology, Erosion, Araya, Sucre, Venezuela |
| Full text: | Texto completo (Ver PDF) |
