Framework for adaptive reuse of expressway leftover landscapes in Sri Lanka: a landscape architectural perspective

Abstract

In the wake of rapid urbanization and infrastructure development, the landscape architectural realm faces a pressing challenge, which is how to repurpose and revitalize the leftover landscapes generated by expressway construction projects. This case study project explores the transformative potential of repurposing these residual spaces, reimagining them as vibrant, functional, and sustainable elements within the selected context. The case study was based on the central expressway of Sri Lanka, specifically the Nakalagamuwa Interchange of Section 02 of the expressway project. The case study aims to create a framework for repurposing Sri Lankan expressways’ leftover landscapes that mitigates the negative impacts of mass linear developments while promoting ecological regeneration and strengthening social bonds. This research for conceptualizing, designing, planning, and maintenance will be guided using the concluded framework, within the context of Sri Lankan expressway residual landscapes. Through adaptive reuse, community-centered design, multifunctional spaces, and sustainable practices. The research project seeks to create a conceptual framework that transforms infrastructure into community assets that enhance quality of life, celebrate local heritage, and promote environmental sustainability. The analysis was done under categories of geo-spatial formations with soil profile, natural hydrological systems, socio-cultural landscapes, and ecosystems. The research will address the natural land disturbances, deforestation, hydrological changes, habitat disruption, and sustainable use of natural resources while resulting in a conceptual framework to mitigate the above consequences. Research formulation was based on the 15th goal (Life on Land) of the UN’s sustainable development goals and the theoretical framework was based on the golden circle theory. For the case study location selection, land resources were categorized under 3 categories: leftover lands after earth resource extraction, unfunctional spaces created by newly constructed structures, and left behind land after the project completion.