丽阳坑流域城市洪涝耦合模拟及风险分析
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作者单位:

1.南京师范大学;2.丽水市建设技术管理中心

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P33

基金项目:

国家自然科学基金资助项目(42271483);江苏省自然资源科技项目(JSZRKJ202405)


Coupling Simulation and Risk Analysis of Urban Flood in the Liyangkeng watershed
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Affiliation:

1.Lishui City Construction Technology Management Center;2.Nanjing Normal University

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    摘要:

    丽阳坑流域北东山地,南瓯江西好溪,地势北高南低,河流贯穿丽水主城,因特殊地形,成为洪涝频发区域。针对丽阳坑流域上属自然流域、下属居民区的空间分布特点与外洪内涝的情景,选用STFS-Urban模型对该流域城市洪涝进行“地表-管网-河道”耦合的综合建模模拟。基于STFS-Urban模型的洪涝情景模拟结果,结合丽水市的自然、社会数据评估丽阳坑流域下城区可能的洪涝风险,从暴露度、敏感性、适应性三个方面构建流域城市洪涝脆弱性综合评价指标体系,以洪涝情景下城市脆弱性程度反应风险等级。结果表明,STFS-Urban模型在模拟上有较好的精度;随着重现期增大,高风险区域显著增加,集中在河流交汇处,为城市防洪排涝提供了重点参考。

    Abstract:

    The Liyangkeng watershed features mountainous terrain in the east and the north, adjacent to the Oujiang River and the Haoxi River, with a topography sloping from high in the north to low in the south. The river traverses the main urban area of Lishui City. Due to its unique topography, it is a region prone to frequent flooding. Addressing the spatial distribution characteristics of the watershed – a natural upper basin and a residential lower basin – and the scenario of external flooding and internal waterlogging, the STFS-Urban (Spatio-temporal flood simulation model for urban,STFS-Urban) was selected to conduct comprehensive coupled modeling and simulation of urban flooding in this watershed, integrating "surface-pipe-river" interactions. Based on the flood scenario simulation results from the STFS-Urban model, combined with natural and social data from Lishui City, the potential flood risk in the urban area of the Liyangkeng watershed was assessed. A comprehensive evaluation index system for urban flood vulnerability within the watershed was constructed from three aspects: exposure, sensitivity, and adaptability. The degree of urban vulnerability under flood scenarios was used to reflect the risk level. The results indicate that the STFS-Urban model demonstrates good accuracy in simulation. As the return period increases, high-risk areas increase significantly, concentrating near river confluences. This provides key reference points for urban flood control and drainage planning.

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  • 收稿日期:2024-11-13
  • 最后修改日期:2025-07-05
  • 录用日期:2025-07-09
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