Caracterización geológica, geomorfológica y geotécnica preliminar a escala 1: 25.000 como insumos en cercanías de la cabecera municipal de Cumbitara, Nariño.

Abstract

Currently the mayor of Cumbitara is executing the review, adjustment and updating of the territorial ordering scheme - EOT, to guarantee an efficient and effective development of the current levels of quality of life and guide its development in such a way that it is sustainable and adequate to the evolution of the municipality. Therefore, it is necessary to update and incorporate risk management in the territorial ordering within the framework of Law 1523 of 2012. The project was carried out with the purpose of presenting an input for the Municipality of Cumbitara, Nariño focused on the “preliminary geological, geomorphological and geotechnical characterization for the Municipality of Cumbitara, Nariño. Scale 1:25.000”, for future mitigation plans and non-structural and structural measures, within the framework of disaster risk management and progress in infrastructure and development projects. The methodology consisted of 5 phases. The first related to the compilation of geological, geomorphological, and bibliographical information on the area; In the second phase, preliminary maps corresponding to the geology, geomorphology and morphometric parameters were made. In phase three, verification was carried out with field work and cartography. Subsequently, the analysis and interpretation of the information obtained in the field was carried out, to finally carry out the geological, geomorphological characterization and the geotechnical variants of the municipal seat of Cumbitara. The geomorphology of the area is composed of 4 environments, from which 8 units and 12 subunits unfold; the structural environment is made up of 3 elements, a consequence of the processes related to the internal dynamics of the planet earth, due to the folding and faulting of the rocks, whose morphological term is defined by the tendency and variation of resistance of the units; The denudational environment is made up of 6 elements, formed by the combination of processes from moderate to intense erosion, weathering and transport due to the effects of gravity, pluvial system and fluvial processes that model leaving remnants of the pre-existing units, likewise, they originate new due to sediment accumulation; The fluvial environment is made up of 2 elements, due to the erosion of the El Matadero and San Pablo, sedimentation in areas adjacent to said currents, either in times of great torrential avenues or floods. The anthropic environment is made up of an element, due to the intervention of man that modifies the natural morphology of the land surface. In the results obtained, it was highlighted that the area is susceptible to mass removal phenomena and torrential floods, as a result a susceptibility to the threat and risk of these phenomena is generated in rural areas of the municipality of Cumbitara.