Journal of Food, Agriculture and Environment

Investigation of effective parameters on stepped and straight drops energy dissipation using physical modeling

Author(s):

Adell Moradi Sabzkoohi ¹, Seyed Mahmood Kashefipour ², Mahmood Bina ²

Recieved Date: 2011-06-10, Accepted Date: 2011-09-28

Abstract:

Drop structures, due to simplicity of building and maintenance, are one of the most common and important hydraulic structures used for dissipating the excess energy and water transmission from a higher level to a lower level as well. The excess energy of flow dissipates in two mainly different ways; one due to the geometric shape of the drop, which occurs along the structure (briefly named Drop Structural Loss or DSL) and another due to hydraulic jump which may take place, according to the flow conditions, at the toe of drop, distant from the toe or over the drop. If the effective parameters on DSL would be better recognized, it would be possible to minimize the dimensions of the drop and further supplementary structures such as stilling basin. In this research, to achieve the relations between geometric-hydraulic parameters of straight and stepped drops and DSL, after dimensional analyzing and recognition of the effective dimensionless parameters on DSL, 2 physical models of straight drops and 8 models of stepped drops were built in 2 height of 15.5 and 25.5 cm. A wide range of discharges from 2.4 to 29.2 lit/s in 68 experiments were then tested in a flume of 25 cm width, 10 m length and with horizontal bed slope. The experimental results were compared with some results of previous studies and some differences between drop and spillway structures were inferred. After a statistical analysis, two equations based on non-linear regression were presented.

Keywords:

Drop structure, stepped drop, straight drop, energy loss

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Journal: Journal of Food, Agriculture and Environment
Year: 2011
Volume: 9
Issue: 3&4
Category: Environment
Pages: 748-753

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