Examinando por Materia "Transporte de sedimentos"

Mostrando 1 - 2 de 2
  • No hay miniatura disponible
    Ítem
    Evolución morfológica en la franja litoral al sur de Puerto Colombia, Atlántico, durante el siglo XX
    (Universidad EAFIT, 2023) González Campillo, Michelle Esthefany; Paniagua Arroyave, Juan Felipe
    In Colombia, the increased in erosion processes poses a threat to both infrastructure and coastal landscape. Many of the solutions implemented to combat coastal erosion had a negative impact on ecosystems and local communities. In Puerto Colombia, the construction of the jetties in Boca de Ceniza altered coastal dynamics by obstructing the flow of sediment from the Magdalena River. This obstruction resulted in a sediment deficit on nearby beaches and changed the oceanographic conditions in the littoral cell. The modification in coastal dynamics caused the migration of the sand barrier known as Isla Verde towards the coastal strip of Puerto Colombia. This change led to the formation of small lagoons that eventually evolved into mangrove zones, giving rise to the Balboa’s swamp. This wetland, located in the south of the municipality, is fed by tributaries that are being contaminated, such as the Arroyo Grande, which crosses Puerto Colombia and collects wastewater from the oxidation lagoon. Due to the change in coastal dynamics caused by the western seawall of Bocas de Cenizas, sediments migrated to the southwest, depositing in the Puerto Velero spike in Tubará. This phenomenon, combined with ocean-atmospheric conditions, has increased the frequency of extreme events, exposing the coastal strip to greater erosion. Therefore, the development of a disaster risk management plan is essential to ensure the protection and sustainability of coastal areas, especially this wetland, which is vital for biodiversity. This plan should take into account the natural and anthropogenic factors that contributing to coastal erosion and adaptation measures to climate change.
  • No hay miniatura disponible
    Ítem
    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.