El derecho a la ciudad en América Latina : visiones desde la política

En un contexto internacional y local donde las contradicciones urbanas y sociales son un escenario recurrente es impostergable e imprescindible discutir sobre el Derecho a la Ciudad, el cual es una utopía de justicia espacial construida por diversos colectivos sociales en distintas partes de América Latina y del mundo. Esta utopía urbana no reivindica la reconquista de una ciudad perdida, sino la conquista de una ciudad que no hemos sabido construir: una ciudad para todos. El Derecho a la Ciudad implica la búsqueda de una gestión urbana democrática e incluyente en la que no sólo decidan qué hacer en ella el capital inmobiliario y el gobierno, sino también quienes la habitan, trabajan y/o disfrutan de la ciudad. Las ciudades con mejor calidad de vida son aquellas capaces de comprometer e involucrar a sus ciudadanos y de garantizar, por tanto, una gestión urbana participativa y democrática. La participación activa de la ciudadanía en los procesos de construcción, apropiación y administración colectiva de la ciudad son claves para construir una ciudad socialmente justa, que posibilite a los ciudadanos defender el interés público

Regional controls in the distribution and morphometry of deep-water gravitational deposits along a convergent tectonic margin. Southern Caribbean of Colombia

Deep-water fold and thrust belts often develop in convergent tectonic margins, creating irregular slope profiles that control the distribution of deep-water gravity deposits. However, in areas with high sediment supply, the erosion and sedimentation can minimize structural relief and smooth the slope. Using multibeam bathymetry with 3D seismic data, we analyze the distribution of deep-water gravity-driven deposits along the convergent margin of the southern Caribbean of Colombia, comparing areas with different continental sediment supply, slope profile, and shelf width. We identify three geomorphological zones: The Northern, Central and Southern Zones. The Northern Zone is characterized by a gentle slope topography, high sediment supply, and large (>100 km length) channel-levee systems traversing the slope and basin floor. In this zone, shelf-attached mass-transport deposits erode and smooth sea-floor topography. The Central Zone is characterized by low sediment supply and steep and irregular slope topography. Here, short-runout mass-transport deposits sourced from the crests and steep flanks of emergent anticlines are common. The irregular relief created by tectonic deformation forms barriers for sediment transport, leading to tortuous sediment-flow pathways. Submarine canyons incise the thrust-cored anticlines, transporting sediment through interconnected, adjacent piggyback sub-basins. Finally, the Southern Zone is characterized by steep slope and moderate sediment supply. Here, tectonic deformation has been smoothed by numerous shelf-attached mass-transport deposits. The erosional scours carved by mass flows merge downslope and evolve into submarine canyons that can deliver mass-transport deposits more than 80 km into the basin. We analyze the impact of slope profile, sediment input and shelf width on the distribution and morphology of deep-water deposits along the southern Colombian Caribbean margin, and present a predictive model for the depositional patterns more likely to develop in other continental margins affected by deep-water fold and thrust belts. © 2020 Elsevier Lt