Paper Information

Journal:   JOURNAL OF WATER AND SOIL (AGRICULTURAL SCIENCES AND TECHNOLOGY)   JULY-AUGUST 2012 , Volume 26 , Number 3; Page(s) 775 To 785.
 
Paper: 

HYDRAULIC JUMP ON A BED WITH HALF CYLINDRICAL SHAPE BARS

 
 
Author(s):  PARSAMEHR P.*, HOSSEINZADEH DALIR A., FARSADIZADEH D., ABBASPOUR A.
 
* DEPARTMENT OF WATER ENGINEERING, FACULTY OF AGRICULTURE, UNIVERSITY OF TABRIZ, IRAN
 
Abstract: 

Hydraulic jump is generally used for the dissipation of excess kinetic energy downstream of hydraulic structures such as spillway, chutes and gates. In the present research, hydraulic jump characteristics on a new rough bed -with half cylindrical shape bars- have been investigated experimentally. The roughness elements were used with three different heights and four different longitudinal spacing. Experiments were performed for a range of Froude numbers from 4.6 to 7.4.The results showed that the sequent depth ratio and the length of the jump on rough beds are 25.35% and 38.5% smaller and energy loss is 18% greater than classic jump. The bed shear stress coefficient on roughed bed is about 13 times of its corresponding smooth bed. These effects are intensified as the height, spacing of the rough bars and the Froude number of flow increased. Some empirical relations for sequent depth ratio, length of the hydraulic jump, relative energy loss and bed shear stress coefficient have been introduced.

 
Keyword(s): BED SHEAR STRESS COEFFICIENT, HYDRAULIC JUMP, ENERGY LOSS, ROUGH BED
 
References: 
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