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	Discontinuous Galerkin flood model formulation: Luxury or necessity?
	Kesserwani G. ; Wang Y. L.
	2014
关键词	flood modeling numerical methods RKDG2 versus MUSCL shallow water equations terrain data shallow-water-equations arbitrary topography flows application godunov-type reconstruction simulations gradient scheme
英文摘要	The finite volume Godunov-type flood model formulation is the most comprehensive amongst those currently employed for flood risk modeling. The local Discontinuous Galerkin method constitutes a more complex, rigorous, and extended local Godunov-type formulation. However, the practical merit associated with such an increase in the level of complexity of the formulation is yet to be decided. This work makes the case for a second-order Runge-Kutta Discontinuous Galerkin (RKDG2) formulation and contrasts it with the equivalently accurate finite volume (MUSCL) formulation, both of which solve the Shallow Water Equations (SWE) in two space dimensions. The numerical complexity of both formulations are presented and their capabilities are explored for wide-ranging diagnostic and real-scale tests, incorporating all challenging features relevant to flood inundation modeling. Our findings reveal that the extra complexity associated with the RKDG2 model pays off by providing higher-quality solution behavior on very coarse meshes and improved velocity predictions. The practical implication of this is that improved accuracy for flood modeling simulations will result when terrain data are limited or of a low resolution. Key Points Improved flood model formulation Comparative performance study Implication to flood modeling practice
出处	Water Resources Research
卷	50
期	8
页	6522-6541
收录类别	SCI
语种	英语
ISSN号	0043-1397
内容类型	SCI/SSCI论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/29788]
专题	地理科学与资源研究所_历年回溯文献
推荐引用方式 GB/T 7714	Kesserwani G.,Wang Y. L.. Discontinuous Galerkin flood model formulation: Luxury or necessity?. 2014.

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