DOI: 10.5194/hess-21-515-2017
Scopus记录号: 2-s2.0-85010762626
论文题名: Hydrodynamics of pedestrians' instability in floodwaters
作者: Arrighi C ; , Oumeraci H ; , Castelli F
刊名: Hydrology and Earth System Sciences
ISSN: 10275606
出版年: 2017
卷: 21, 期: 1 起始页码: 515
结束页码: 531
语种: 英语
Scopus关键词: Flood control
; Fluid dynamics
; Froude number
; Hydrodynamics
; Risk assessment
; Risk management
; Stability
; Dimensionless number
; Dimensionless parameters
; Flood risk management
; Hydrodynamic forces
; Mobility parameters
; Physical characteristics
; Threedimensional (3-d)
; Threshold of instability
; Floods
; dimensionless number
; disaster management
; environmental education
; flooding
; Froude number
; hydrodynamic force
; numerical model
; pedestrian
; risk assessment
; safety
英文摘要: People's safety is the first objective to be fulfilled by flood risk mitigation measures, and according to existing reports on the causes of casualties, most of the fatalities are due to inappropriate behaviour such as walking or driving in floodwaters. Currently available experimental data on people instability in floodwaters suffer from a large dispersion primarily depending on the large variability of the physical characteristics of the subjects. This paper introduces a dimensionless mobility parameter θP for people partly immersed in flood flows, which accounts for both flood and subject characteristics. The parameter θP is capable of identifying a unique threshold of instability depending on a Froude number, thus reducing the scatter of existing experimental data. Moreover, a three-dimensional (3-D) numerical model describing the detailed geometry of a human body and reproducing a selection of critical pairs of water depth and velocity is presented. The numerical results in terms of hydrodynamic forces and force coefficients are analysed and discussed. Both the mobility parameter θP and the numerical results hint at the crucial role of the Froude number and relative submergence as the most relevant dimensionless numbers to interpret the loss of stability. Finally, the mobility parameter θP is compared with an analogous dimensionless parameter for vehicles' instability in floodwaters, providing a new contribution to support flood risk management and educating people. © Author(s) 2017. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/79282
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Civil and Environmental Engineering, University of Florence, Via di S. Marta 3, Firenze, Italy; Leichtweiß-Institute for Hydraulic Engineering and Water Resources, TU Braunschweig, Beethovenstrasse 51a, Braunschweig, Germany
Recommended Citation:
Arrighi C,, Oumeraci H,, Castelli F. Hydrodynamics of pedestrians' instability in floodwaters[J]. Hydrology and Earth System Sciences,2017-01-01,21(1)