The importance of gully flow modelling to urban flood simulation

Jiun Huei Jang, Chi Tai Hsieh, Tien Hao Chang

研究成果: Article同行評審

摘要

Urban flood simulation often ignores or simplifies the function of underground gully systems due to data and computational limitations. To discover the influence of gullies on urban flooding, a novel approach is proposed in this study, by fully-coupling a 1D gully flow model (GFM), a 1D sewer flow model (SFM), and a 2D overland flow model (OFM) to simultaneously simulate the flow exchanges between surface, gullies and sewer pipes. This fully-coupled approach is compared with a simplified approach which directly introduces surface water into sewer pipes without being via gullies. The validation results show that the fully-coupled approach considerably reduces the underestimation of flood extent by 27% compared with the simplified approach. Without considering the capacity of lateral tubes between gullies and sewer pipes, the simplified approach over-drains the surface water into sewer pipes. The modelling of gully flow is crucial for correctly evaluating the efficiency of drainage systems.

原文English
頁(從 - 到)377-388
頁數12
期刊Urban Water Journal
16
發行號5
DOIs
出版狀態Published - 2019 五月 28

All Science Journal Classification (ASJC) codes

  • Geography, Planning and Development
  • Water Science and Technology

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