Paper Information

Journal:   THE SCIENTIFIC JOURNAL OF AGRICULTURE (SJA)   MARCH 2008 , Volume 30 , Number 4-A; Page(s) 61 To 76.
 
Paper: 

THE INVESTIGATION OF THE EFFECTS OF THE RESERVOIR WATER DEPTH AND OUTFLOW DISCHARGE THROUGH THE OUTLET ON THE FLUSHED SEDIMENT, UNDER PRESSURE FLUSHING

 
 
Author(s):  EMAMGHOLIZADEH S.*, BINA M., GHOMEYSHI M.
 
* DEPARTMENT OF WATER STRUCTURES, FACULTY OF WATER SCIENCES ENGINEERING, SHAHID CHAMRAN UNIVERSITY, AHVAZ
 
Abstract: 

For desilting the deposited sediment, flushing method could be used in two different methods: Free Flushing and Pressure Flushing. In the latter, the previously deposited sediment would be flushed from the reservoir by opening of the outlets, and typically the scour cone "Flushing Cone" developed near the outlet in the reservoir. The scour cone geometry was influenced by many factors including water depth on the bottom outlets, outflow discharge through the bottom outlet, outlet geometry, characteristic of the sediments which deposited in the reservoir, etc. In this study, the effect of the outflow discharge through the bottom outlet and the water depth on the bottom outlets were investigated by non-cohesive sediment with d50=0.27mm. For this purpose, laboratory experiments were performed, so a physical model was constructed in the Hydraulic Laboratory at the faculty of Water Engineering and Science, University of Shahid Chamran, Ahvaz, Iran. The result of this research showed the flushed sediment increased with the decrease of reservoir's water depth, as the reduction of water depth equal to 31.5% caused the scour cone volume and its length to increase to 41.5% and 14.5%. Also the decrease of 76.6%, outflow discharge caused the scour cone volume and its length decreased to 20.3% and 49.9% respectively. Also based on the satirical analysis, non-dimensional relations for determining the flushing cone volume and its length are represented.

 
Keyword(s): PRESSURE FLUSHING, NON-COHESIVE SEDIMENT, OUTLETS, RESERVOIR, WATER DEPTH, DISCHARGE
 
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