INTERNATIONAL IDEAS COMPETITION THE ANDALIÉN BASIN, HABITATION OF (TO) THE LIMIT. FLUVIAL RESTORATION AND URBAN DESIGN Sixteen projects prepared by multidisciplinary teams, some of them foreign, participated in this call that is part of a macro project of ecological restoration and urban design for the Andalién river basin, which crosses from the city of Concepción to the bay of Talcahuano.
As part of a Fondart project developed by Universidad de Concepción, the goal of the competition was to gather proposals and alternatives for the ecosystem of the Andalién river, in a scenario of barely planned urban expansion and with increasing socio-natural risks due to the occupation of land on the riverbank. It is estimated that more than 80% of the expansion planned for Concepción is within the basin, hence the relevance of systematic planning. Due to the size of the project, the competition defined the development of multi-scale proposals and feasible solutions rooted in the context, articulating social demands, ecological dynamics and safety problems facing natural risks. The Andalién river crosses part of the city of Concepción and the municipalities of Penco and Talcahuano, crossing settlements and urban areas located in sectors of high risk and ecological value. The proposals had to involve a range of scales from the
basin to the bay of Talcahuano, and then design in detail one of three specific areas. The EULA Center for Environmental Sciences of Universidad de Concepción was in charge of the organization, with a team headed by architect and PhD in Landscape Planning Paulina Espinoza and architect Leonardo Agurto, among others. In addition, a team of international external reviewers composed of Kelly Shannon and Bruno Meulder (KU Leuven), Antje Stokman (University of Hamburg), Mathias Kondolf (UC Berkeley), Alfredo Ollero (Universidad de Zaragoza), Gonzalo Lizarralde (University of Montreal), María Dolores Muñoz and Alejandra Stehr (EULA - UDEC) and Sergio Baeriswyl (UBB), as well as a jury made up of representatives of the community, the government and the private sector, among them, Yves Besançon, director of the AOA and AOA Magazine. The jury unanimously decided to award two first prizes.
Champion species Especies precursoras
Problemática: Bosques nativos/no nativos quemados en laderas no erosionadas Estrategia destacada: • Creación de nueva industria renovable del corcho • Creación de nuevas terrazas agrícolas en proximidad a los asentamientos existentes Problematic: Burned native/non-native forests on non-eroded slopes Highlighted strategy: • Create new renewable cork industry • Create new agro-terracing in proximity to existing settlements
Problemática: Bosques nativos/no nativos quemados en laderas erosionadas Estrategia destacada: • Creación de nuevas terrazas agrícolas con vegetación nativa de raíces profundas Problematic: Burned native/non-native forests on eroded slopes Highlighted strategy: • Create new agro- terracing with deep
Problemática: Monocultivo en laderas erosionadas Estrategia destacada:
Problemática: Monocultivo en laderas no erosionadas Estrategia destacada: • Nuevas industrias agrícolas con zanjas de retención asociadas Problematic: Monoculture on non-eroded slopes Highlighted strategy: • New agricultural industries with associated retention trenches
• Eliminación progresiva de monocultivo + reemplazo con industria productiva forestal • Vegetación estabilizadora de la pendiente • Agrupamiento de cotas a intervalos de 20 m Problematic: Monoculture on eroded slopes Highlighted strategy: • Phase out monoculture + replace with productive timber industry • Slope-stablising vegetation • Contour bunding at 20 m intervals
Problemática: Corredor ribereño fragmentado Estrategia destacada: • Corredor ribereño fortalecido con vegetación nativa y húmeda que mitigue las inundaciones Problematic: Fragmented riparian corridor Highlighted strategy: • Strengthened riparian corridor with native, humid flood mitigating vegetation
rooted native vegetation
Corte fugado compuesto de la propuesta Proposed composite sectional perspective
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