Paper Information

Journal:   JOURNAL OF WATER AND SOIL (AGRICULTURAL SCIENCES AND TECHNOLOGY)   MAY-JUNE 2012 , Volume 26 , Number 2; Page(s) 282 To 289.
 
Paper: 

THE EFFECT OF TRIANGULAR BLOCKS ON THE CHARACTERISTICS OF HYDRAULIC JUMP

 
 
Author(s):  NAJANDALI A.*, ESMAILI K., FARHOUDI J.
 
* WATER ENGINEERING DEPARTMENT, COLLEGE OF AGRICULTURE, FERDOWSI UNIVERSITY OF MASHHAD
 
Abstract: 

High energy losses by hydraulic jump cased these phenomena known as dissipater energy through water conveyance channels. Basin bottom roughness is an important factor for control, reducing length and conjugated depth and increase energy losses by hydraulic jump. In this study the effects of cross triangular roughness space on hydraulic jump is investigated. Total of 126 experiments were carried out on rough bed with different distance in the Froude number of incoming flow was varying between 4 to 13.7. Comparing the final result showed that secondary depth and hydraulic jump length will decrease considerably on rough bed in compare to smooth bed. The energy loss will increase and it will be intensified by climbing Froude number. The nondimensional flow profile of hydraulic jump follows a unified curve. It was also revealed that the increase in height and spacing of rough elements decrease the length of jump, length of rollers and the sequent depth. It is found the bed shear stress is 10 times bigger than that on smooth bed.

 
Keyword(s): RAPIDLY VARIED FLOW, HYDRAULIC JUMP, ENERGY LOSS, TRIANGULAR BLOCK, SPACE OF BLOCK
 
References: 
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