Modeling of pattern and dissipating energy in the gabion stepedspillway using flow-3D

Journal of Water Science & Engineering

مقاله 7، دوره 1، شماره 3، خرداد 2012، صفحه 89-97   

نوع مقاله: Original Article

نویسندگان

K Alasvand^{* 1}؛ J Ahadian²؛ H Fathian³

¹Hydraulic Structures, Islamic Azad University Shoushtar branch, Iran.

²Facalty member, water sciences department Shahid Chamran university of Ahvaz.

³Facalty member, water sciences department, Islamic Azad University of Ahvaz.

چکیده

Characteristics and behavior of the flow in hydraulic structures, a complex phenomenon that is
imperative to use software that will beto be study.Gabiony stepped spillway is a simple hydraulic
structures to control erosion downstream of dams, and, depreciation of structures is used. Rough
stairway consisting of overflow from the stairs near the crest of the weir is started and continues to
have a lower heel. Research shows that the rate of depreciation of energy in Spillways stairs of the flat
(no stairs) has the same size . In this study, the ratio of width to length roughness (b / h) was equal to
0.25 , 0.5 ,1 , and three-positions height roughness and three-state roughness height to flow 220, 4
(lit/s). In the nine-step model with a height of stair 0.1 m and 21-degree slope was investigated And
the roughness effect on the distribution of power and the creation of the vortex on the stairs of a
stepped spillway Gabyvny was down by Flow-3D software . This research showed rough results in the
flow range 0.004 , 0.009 , 0.01(m^3/s) by the nappe regime to collapse and from flow 0.016 meters
per second to the higher flow is a skmming flow regime. Most energy-related depreciation In the flow
0.016 with 79.5 Percent Energy depreciate and Depreciation less energy to flow 0.22 (m^3/s) with
20.4 Percent of energy is depreciate.

کلیدواژه‌ها

Depreciation Energy؛ Stepped spillway Gabyvny؛ vortex flow؛ Flow-3D Software

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