Multi-Mode Surface Generalization Supports a Detailed Urban Flooding Simulation Model

doi:10.3389/feart.2021.540473

	Multi-Mode Surface Generalization Supports a Detailed Urban Flooding Simulation Model
	Xu, Mei 1; Yao, Yonghui 3; Liu, Shu 1; Sun, Yang 2; Yan, Yuexin 2
刊名	FRONTIERS IN EARTH SCIENCE
	2021-03-30
卷号	9 页码:16
关键词	detailed urban flooding model urban waterlogging surface generalization elevation amendment Beijing city
DOI	10.3389/feart.2021.540473
通讯作者	Yao, Yonghui(yaoyh@lreis.ac.cn)
英文摘要	With the aim of achieving high precision and high efficiency, recent research on hydraulic flood models has tended to focus on the algorithms for solving the shallow water equations of Saint-Venant. While development of the algorithms will help to improve the simulation precision and the solving of specific problems, the other influential factor in flood risk modeling is the precision and reasonable generalization of the data. This is even more important for increasing the model's computational accuracy and efficiency but is frequently undervalued. Frequent rainstorm waterlogging is having a serious impact on China's large cities. Early warning of waterlogging risk following a rainstorm forecast is an effective method for preventing or reducing potential losses. Concrete waterlogging information including locations, depth, and process is essential for early warnings. This paper focuses on the influence of data precision and reasonable generalization on an urban flooding model. A detailed hydraulic urban flooding model characterized by detailed data processing and component coupling can help to provide advance information. In Beijing city, road networks, overpasses, and buildings are so highly concentrated that rainstorms easily result in waterlogging in low-lying locations. Therefore, partial microrelief is the determinate factor in waterlogging simulation. This paper shows that multi-mode surface data generalization and detailed model coupling support a perfect simulation of a Beijing urban flooding model. The influence of buildings, roads, and overpasses on surface water flow was carefully considered based on the innovative aspect of a fine generalization of partial microrelief. One novelty is the simulation of the whole overland flow from the beginning of rainfall to mesh, not only from manhole overflow, because the waterlogging is caused mainly by initial surface water runoff rather than by manhole overflow. A second novelty is the use of a new kind of coupling mode based on physical mechanisms between surface and pipe models. Here, rain perforated strainers instead of manholes play a role as flow exchange points between pipe and surface. This coupling mode is much closer to the real world. Based on a detailed Beijing urban flooding model, a scenarios library of typical rainfall events and corresponding waterlogging results was constructed. Several years of practice have demonstrated that a rich library of scenarios can be used effectively for the quick identification and early warning of waterlogging risk for a forecast rainfall. Test results show that multi-mode surface generalization is effective in improving outcomes and useful for scientific decision making in controlling urban waterlogging.
资助项目	Strategic Priority Research Program of the Chinese Academy of Sciences[XDA 20030302] ; National Key Research and Development Plan of China[2016YFC0803107]
WOS研究方向	Geology
语种	英语
出版者	FRONTIERS MEDIA SA
WOS记录号	WOS:000639424100001
资助机构	Strategic Priority Research Program of the Chinese Academy of Sciences ; National Key Research and Development Plan of China
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/161834]
专题	中国科学院地理科学与资源研究所
通讯作者	Yao, Yonghui
作者单位	1.China Inst Water Resources & Hydropower Res, Minist Water Resources, Res Ctr Flood & Drought Disaster Reduct, Beijing, Peoples R China 2.Beijing Water Author, Beijing, Peoples R China 3.Chinese Acad Sci, State Key Lab Resources & Environm Informat Syst, Inst Geog Sci & Nat Resources Res, Beijing, Peoples R China
推荐引用方式 GB/T 7714	Xu, Mei,Yao, Yonghui,Liu, Shu,et al. Multi-Mode Surface Generalization Supports a Detailed Urban Flooding Simulation Model[J]. FRONTIERS IN EARTH SCIENCE,2021,9:16.
APA	Xu, Mei,Yao, Yonghui,Liu, Shu,Sun, Yang,&Yan, Yuexin.(2021).Multi-Mode Surface Generalization Supports a Detailed Urban Flooding Simulation Model.FRONTIERS IN EARTH SCIENCE,9,16.
MLA	Xu, Mei,et al."Multi-Mode Surface Generalization Supports a Detailed Urban Flooding Simulation Model".FRONTIERS IN EARTH SCIENCE 9(2021):16.