Carbon emission analysis of ecological slope protection based on lifecycle theory and sobol method

Abstract

To analyze the main contributors to carbon emissions throughout the lifecycle of ecological slope protection, this study employed a novel lifecycle carbon emission assessment model alongside the Sobol method. The emissions across various project stages were calculated, and the sensitivity of different emission sources was analyzed, resulting in targeted reduction strategies. The findings indicate that the total carbon emissions for ecological slope protection over its lifecycle reached 4338.20 tons, with 4470.12 tons emitted during the construction phase and 131.92 tons absorbed during maintenance. The retaining wall and anchor beam slope protection projects accounted for approximately 75 % of construction emissions, while vegetation contributed to the absorption of around 3 % of the project's carbon emissions. Sensitivity analysis revealed that rebar and C30 concrete were the most significant carbon emission sources. The results demonstrate that ecological slope protection offers a substantial carbon reduction effect compared to other slope protection methods. The construction phase is critical for controlling emissions, with a focus on reducing carbon emissions during material production. Strategies should include improvements in raw materials, production processes, and product quality. Additionally, selecting native plants and implementing a reasonable maintenance plan can further enhance carbon reduction effectiveness. This study provides theoretical support and technical references for the design and construction of ecological slope protection projects.