Abstract
In order to simulate the effects of reconstructing misconnected nodes in the drainage system and quantify sewage routing paths during the rainy season, we have selected a specific region in Fangchenggang City as our study area. All misconnected nodes have been divided into 10 areas based on their respective blocks and streets. COD, NH4+-N, TN, and TP are chosen as evaluation indexes, and we have utilized SWMM for modelling purposes. The results indicate that nodes located upstream within the drainage watershed tend to have a broader influence scope, with a maximum pollutant load reduction rate of 8.6%. However, it is worth noting that the normalization effect could worsen if a reconstruction scheme contains more nodes. Our methodology for calculating the pollutant load reduction rate of pipelines presents a novel approach for quantifying pollutant reduction effects, sewage flow paths, and geographical visualization. This approach has the potential to address the knowledge gap in exploring pollutant transfer routes.
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