DOI: 10.5194/hess-19-3857-2015
Scopus记录号: 2-s2.0-84941703046
论文题名: Computation of vertically averaged velocities in irregular sections of straight channels
作者: Spada E ; , Tucciarelli T ; , Sinagra M ; , Sammartano V ; , Corato G
刊名: Hydrology and Earth System Sciences
ISSN: 10275606
出版年: 2015
卷: 19, 期: 9 起始页码: 3857
结束页码: 3873
语种: 英语
Scopus关键词: Friction
; Rivers
; Water levels
; ANSYS CFX codes
; Elementary solids
; Empirical coefficients
; Friction factors
; Hydraulic radius
; Longitudinal velocity
; Straight channel
; Unsteady state analysis
; Integral equations
; algorithm
; channel
; comparative study
; cross section
; empirical analysis
; experimental study
; friction
; hydraulic structure
; hydrograph
; river
; steady-state equilibrium
; three-dimensional modeling
; velocity
; velocity profile
; water depth
; water level
; Alzette River
; Luxembourg [Benelux]
英文摘要: Two new methods for vertically averaged velocity computation are presented, validated and compared with other available formulas. The first method derives from the well-known Huthoff algorithm, which is first shown to be dependent on the way the river cross section is discretized into several subsections. The second method assumes the vertically averaged longitudinal velocity to be a function only of the friction factor and of the so-called "local hydraulic radius", computed as the ratio between the integral of the elementary areas around a given vertical and the integral of the elementary solid boundaries around the same vertical. Both integrals are weighted with a linear shape function equal to zero at a distance from the integration variable which is proportional to the water depth according to an empirical coefficient β. Both formulas are validated against (1) laboratory experimental data, (2) discharge hydrographs measured in a real site, where the friction factor is estimated from an unsteady-state analysis of water levels recorded in two different river cross sections, and (3) the 3-D solution obtained using the commercial ANSYS CFX code, computing the steady-state uniform flow in a cross section of the Alzette River. © Author(s) 2015. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/78427
Appears in Collections: 气候变化事实与影响
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作者单位: Dipartimento di Ingegneria Civile, Ambientale, Aerospaziale, Dei Materiali (DICAM), Università Degli Studi di Palermo, Viale delle Scienze, Palermo, Italy; Dipartimento di Ingegneria Civile, dell'Energia, dell'Ambiente e Dei Materiali (DICEAM), Università Mediterranea di Reggio Calabria, Via Graziella, Reggio Calabria, Italy; Centre de Recherche Public - Gabriel Lippmann, 41 rue du Brill, Belvaux, Luxembourg
Recommended Citation:
Spada E,, Tucciarelli T,, Sinagra M,et al. Computation of vertically averaged velocities in irregular sections of straight channels[J]. Hydrology and Earth System Sciences,2015-01-01,19(9)