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Paper Information

Title: 

TIME DEVELOPMENT OF SCOURING AROUND RECTANGULAR PIERS WITH SUBMERGED VANES

Type: PAPER
Author(s): HOSSEINI SEYYED HOSSEIN,HOSSEINZADEH DALIR ALI,FARSADIZADEH DAVOUD
 
 
 
Name of Seminar: INTERNATIONAL CONFERENCE ON COASTS, PORTS AND MARINE STRUCTURES (ICOPMAS) PORTS & MARITIME ORGANIZATION
Type of Seminar:  CONFERENCE
Sponsor:  PORTS AND MARITIME ORGANIZATION
Date:  2010Volume 9
 
 
Abstract: 

SCOURING IS CONSIDERED AS A DESTRUCTIVE PHENOMENON AND ENGINEERS HAVE ALWAYS ATTEMPTED TO ESTIMATE EXACT AMOUNT OF THIS PROCESS. DIFFERENT METHODS HAVE BEEN SUGGESTED AS A COUNTERMEASURE TO CONTROL OR SLOW DOWN THE PROCESS AROUND THE PIERS. SCOURING IS A TIME DEPENDENT PROCESS THEREFORE TIME PLAYS AN IMPORTANT ROLE IN THE DEVELOPMENT AND DESTRUCTION RATES. IN THIS STUDY, DEVELOPMENT RATE OF SCOURING PROCESS AROUND THE ROUND NOSE RECTANGULAR PIERS WITH SUBMERGED VANES WAS INVESTIGATED. SUBMERGED VANES ALTER AMOUNT AND DIRECTION OF SHEAR STRESS ON THE BED BY PRODUCING SECONDARY FLOW THAT LEADS THE VELOCITY, DEPTH AND SEDIMENT TRANSPORT TO BE CHANGED. EXPERIMENTS WERE CARRIED OUT WITH PIERS ALIGNED AND SKEWED AT 5 AND 10 DEGREES TO THE FLOW DIRECTION AND WITH SUBMERGED VANES AT VARIOUS ARRANGEMENTS. IN THE EXPERIMENTS USING SUBMERGED VANES, TWO ANGLES OF ATTACK NAMELY 20 AND 30 DEGREES AND THREE VANES HEIGHTS OF 0, 1.25 AND 2.5 CM ON THE BED WERE EMPLOYED. THE RESULTS SHOWED THAT IN ADDITION TO CONTROL THE SCOURING PROCESS IN FRONT OF PIER, SUBMERGED VANES ALSO DECREASE THE RATE OF SCOURING. MAXIMUM REDUCTION OF SCOUR DEPTH WAS 45.47%, 39.76% AND 27.78% FOR SUBMERGED VANES WITH HEIGHT OF 2.5 CM ON THE BED AND SKEWED AT 30 DEGREES TO THE FLOW DIRECTION WHEN THE PIER WAS ALIGNED AT 0, 5 AND 10 DEGREES TO THE FLOW DIRECTION RESPECTIVELY.

 
Keyword(s): BRIDGE PIER, SCOURING, SECONDARY FLOW, SUBMERGED VANES, TIME DEVELOPMENT
 
 
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