Examinando por Materia "Human activities"

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    Assessing the geodiversity, morphometrical diversity and sensitivity index in Nuquí – Chocó associated with human activities
    (Universidad EAFIT, 2024) Ramírez Calderón, Miguel Ángel; Marín Cerón, María Isabel
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    Impacto de las actividades humanas en el transporte de sedimentos fluviales hacia los océanos : perspectiva desde el río Magdalena
    (Universidad EAFIT, 2024) Vargas Gómez, Juliana; N/A
    Anthropogenic activities increasingly exert greater control over the production, transport, and accumulation of sediments in river basins. The purpose of this research is to analyze the impact of human activities on sediment transport from rivers to oceans, focusing on the Magdalena River, Colombia’s most important river basin. Human activities have heightened sediment transport, especially in regions dominated by deforestation and agriculture, as seen in the Magdalena River. Globally, while reservoirs retain sediments and reduce transportation to coastal areas in some regions, in others, the impact of deforestation, agriculture, and mining increases the riverine sediment load. Studying variations in sediment transport is essential in the Anthropocene, an era in which human activity is the main agent of environmental change. The use of models like BQART enables estimation and prediction of changes in sediment transport, providing data for resource management and biodiversity conservation in affected areas. In conclusion, the results of this review highlight the need for public policies that mitigate human impact on river systems, promoting sustainable practices to protect both river and coastal ecosystems as well as water quality and at-risk habitats.
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    The perils of human activity on South American deltas: Lessons from Colombia's experience with soil erosion
    (INT ASSOC HYDROLOGICAL SCIENCES, 2013-01-01) Restrepo A., Juan D.; Universidad EAFIT. Departamento de Ingeniería; Ciencias del Mar
    The Andean drainage basins of Colombian deltas exhibit a very delicate variety of ecosystems and environments along its prolonged trajectory, which has made it particularly vulnerable to the onslaught of modernity and human activity. While the increasing intensity of natural disasters in tropical areas is often blamed on global warming, the causes might not be as intractable. Soil erosion and deforestation, both caused by unrestrained human activity, can affect deltas more profoundly. Many anthropogenic influences, including deforestation, an agriculture and pasture increase by 75%, poor soil conservation and mining practices, may have accounted for the overall increasing trends of sediment transport from rivers to Colombian deltas. According to our recent study of human activities in terms of deforestation, 32% of the observed variance in sediment transport from the Magdalena River to its delta could be explained by deforestation. Thus, the amount of sediment transported by the Magdalena to its delta plain, approximately 50 Mt annually, is probably due to deforestation. Also, the Patia River in the Pacific coast has witnessed an increase in sediment transport by 45% during the last decade, an increase mainly accounted for by deforestation. Drawing from Colombia's experience with man-made ecological modifications, this paper offers a preliminary discussion on the implications of human pressure on fluvial ecosystems and their deltas, with the hope that this information will better equip citizens and policymakers across the developing world. Copyright © 2013 IAHS Press.