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Paper Information

Journal:   IRAN-WATER RESOURCES RESEARCH   SPRING 2007 , Volume 3 , Number 1 (7); Page(s) 56 To 67.
 
Paper: 

HEAD VELOCITY AND ENTRAINMENT OF DENSITY CURRENT IN AN EXPANSION REACH

 
 
Author(s):  TORABI POUDEH H., FATHI MOGHADAM MANOUCHEHR, GHOMESHI M., SHAFAEI BAJESTAN MAHMOUD
 
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Abstract: 

Velocity and Entrainment of density current in the expansion reach where a river enters into a dam reservoir, a lake, or open sea is of utmost importance. The present study investigates the head velocity and entrainment of density currents in an Expansion Reach. The effects of discharge and bed slope on the head velocity and entrainment of the density current were evaluated by a physical and 3D mathematical model. Experiments were conducted in a flume, 6.0 meters long, 0.72 meters wide, and 0.6 meters in height. Head velocity was measured for an expansion degree of 8 in slopes of 0.0009 and 0.0016 for various discharges. Important parameters were normalized and a two dimensional laser Doupler was used to develop the flow body velocity profile. The measurements showed that mixing values were higher in a divergent cross-section compared to a fixed cross-section. During some experiments a hydraulic jump was also detected depending upon the levels of the density current and slope of the bed in the divergent cross-section, which was investigated and the results are presented accordingly.

 
Keyword(s): DENSITY CURRENT, STRATIFIED FLOW, RICHARDSON NUMBER, SEDIMENT TRANSPORT
 
References: 
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