Examinando por Materia "Caribbean coast"

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    Ítem
    The Arboletes-Punta Rey Littoral, Southern Caribbean Coast
    (SPRINGER, 2016-01-01) Arango, I.D.C.; Paniagua-Arroyave, J.F.; Universidad EAFIT. Departamento de Geología; Ciencias del Mar
    The Arboletes-Punta Rey littoral is a 5.5-km-long stretch of coast located at the southern Caribbean coast of Colombia, 80 km by car (paved road) to Monteria. Geologically, it is located at terrains of the Sinu folded belt, a tectonically active sedimentary wedge evolving under the morphogenetic influence of numerous onshore and offshore manifestations of mud diapirism. It has a tropical climate. During the dry season (December-April), the zone is under the influences of the N-NE Trade winds that generate swells with wave periods between 6 and 9 s and significant wave heights up to 2 m. These waves are strongly modified by the serrated contours of the coastline and are rapidly eroding the beaches and littoral rocky formations of the area. During the wet season, the trade winds are replaced by lighter, 2-4 m/s, S to SW winds that generate seas with significant wave heights of up to 0.6 m. Net sand drift during the year in the area is toward the SW. The Arboletes-Punta Rey landscape is configured by an emerged marine terrace, a diapiric dome with active mud volcanoes, and by cliffs and their associated erosional features including caves, arches, stacks, and scarps of mass movements. These features are cut on sedimentary, highly weathered and densely fractured mudstones and shales, and in poorly consolidated diapiric muds. Besides its geomorphological interest, the Arboletes littoral is an interesting example of historical, kilometric-magnitude erosional coastline changes driven by the combination of natural-and man-induced causes including, in a short-term perspective, the poor geotechnical properties of rocks, bioerosion, absence of rainfall and waste waters management, strong wave action, beach sand mining, and inadequate coastal engineering practices.
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    Introducción al problema de la erosión litoral en urabá (sector arboletes-turbo) costa caribe colombiana
    (Instituto de Ivestigaciones Marinas y Costeras-INVEMAR, 2004-01-01) Correa I.D.; Vernette G.; Universidad EAFIT. Departamento de Geología; Ciencias del Mar
    Shoreline retreat has been the net dominant historical trend along the 145 km-length littoral between Arboletes and Turbo (Southern Caribbean of Colombia). For the last four decades, there were identified in this littoral shoreline retreats of about 50-100m in several places (Uveros, Damaquiel, Zapata, Turbo) and a maximun of 1.6 km in the Punta Rey-Arboletes area, where land losses were of 4.5 km2, at exceptional rates of 40m/year. The synthesis of the available information suggest that the general "susceptibility" to erosion between Arboletes and Turbo could be related primarily to relative sea level rise, associated to tectonic movements as well as to the effects of mud diapirism and hydroisostacy. In the more critical areas (Arboletes, Turbo), the natural erosive trends were accelerated by anthropic actions, including river diversion (Turbo), beach mining, and inadequate (or total absense) practices for controlling residual and natural waters. Up to August 2000, there were invested about $ Col 10.000 billions in 155 engineering defences (groins, sea walls and rip-rap which totalize 6.2 km of total length and a volume of materials of 37.000 m3). With few exceptions, groins have not been successful and are now part of the problem, accelerating shore erosion along the adyacent sectors. In the short term, the littoral erosion between Arboletes and Turbo is caused both by marine and by subaerial factors. It is facilitated by the poor lithological strengths of cliffs and marine terraces, mainly composed of highly fractured and weathered claystones and mudstones (with stratification and weakeness planes dipping toward sea) and nonconsolidated, easily liquefacted, fine sediments; both conditions facilitate the occurrence of rocks falls, slides and mud flows that result in high figures of cliff retreat (3 to 4m), specially during the first 15 days of the summer-winter transition (April) and in high waves periods. The case of the littoral erosion between Arboletes and Turbo illustrates well how the natural erosive trends of an area can be accelerated by human interventions and the urgent need for coordinating efforts to cope with littoral land losses.
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    The musical experience of the improvisors of the andean area and the colombian caribbean
    (Universidad EAFIT, 2020-05-05) Roa Ordoñez, Henry Gustavo; Rojas Parra, Fabian Manuel; Universidad Sergio Arboleda
    In the music world, the importance of improvisation as a means to promote the active and creative thinking of the musician is widely recognized. Its practice involves, among other things: making decisions in real time, listening to others, predicting and experimenting with new structures and musical organizations and carrying out sensory and perceptual adjustments necessary for an adequate interpretation. This article synthesizes the main conceptions and mechanisms developed by a representative sample of Colombian improvisers in their respective contexts. For this, using an ethnomusicological methodology centered on case study, the authors examine how these musicians conceive improvisation based on their life experiences. The study shows how the instrumental improvisation observed in traditional repertoire is carried out thanks to a previous training within each cultural framework and by the usage of some raw materials and procedures.