气候变化领域集成服务门户(CCPortal): New dynamic two-layer model for predicting depth-averaged velocity in open channel flows with rigid submerged canopies of different densities

CCPortal

DOI	10.1016/j.advwatres.2020.103553
	New dynamic two-layer model for predicting depth-averaged velocity in open channel flows with rigid submerged canopies of different densities
	Yang F.; Huai W.-X.; Zeng Y.-H.
发表日期	2020
ISSN	0309-1708
卷号	138
英文摘要	The depth-averaged velocity is the commonly used engineering quantity in natural rivers, and it needs to be predicted in advance, especially in flood seasons. A model that can provide a unified physical foundation for open channel flows with different canopy densities remains lacking despite ongoing researches. Here, we use the concept of the auxiliary bed to describe the influence of momentum exchange on rigid canopy elements with varying density and submergence. The auxiliary bed divides the vegetated flow into a basal layer and a suspension layer to predict average velocity in each layer separately. In the basal layer, the velocity profile is assumed to be uniform. In the suspension layer, a parameter called “penetration depth” is applied to present the variations in velocity distribution. We also apply a data-driven method, called genetic programming (GP), to derive Chezy-like predictors for average velocity in the suspension layer. Compared to the hydraulic resistance equation for rough-wall flows, the new formulae calculated by the weighted combination method show sound physical meanings. In addition, comparison with other models shows that the new dynamic two-layer model achieves high accuracy in flow rate estimation, especially for vegetated flow with sparse canopies. © 2020 Elsevier Ltd
关键词	Genetic algorithms Genetic programming Quay walls Suspensions (fluids)Velocity Velocity distribution Wall flow Combination method Data-driven methods Depth-averaged velocities Different densities Flow rate estimations Hydraulic resistances Submerged vegetation Two layer model Open channel flow dynamic analysis flood fluid flow open channel flow prediction seasonal variation submerged vegetation
语种	英语
来源机构	Advances in Water Resources
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/131831
推荐引用方式 GB/T 7714	Yang F.,Huai W.-X.,Zeng Y.-H.. New dynamic two-layer model for predicting depth-averaged velocity in open channel flows with rigid submerged canopies of different densities[J]. Advances in Water Resources,2020,138.
APA	Yang F.,Huai W.-X.,&Zeng Y.-H..(2020).New dynamic two-layer model for predicting depth-averaged velocity in open channel flows with rigid submerged canopies of different densities.,138.
MLA	Yang F.,et al."New dynamic two-layer model for predicting depth-averaged velocity in open channel flows with rigid submerged canopies of different densities".138(2020).