EXPERIMENTAL STUDY OF THE EFFECT OF DEGREES OF FREEDOM IN SUBMARINE PIPELINES ON SCOUR PROCESS DUE TO STEADY CURRENT

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Emamgholizadeh Baboli M.J.; MOSTAFA GHAREBAGHI A.R.; ABEDI K.; SEDAGHI M.H.

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Seminar Paper

Paper Information

Seminar: INTERNATIONAL CONFERENCE ON COASTS, PORTS AND MARINE STRUCTURES (ICOPMAS) PORTS & MARITIME ORGANIZATION
Year:2012 | Issue:10

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Title

EXPERIMENTAL STUDY OF THE EFFECT OF DEGREES OF FREEDOM IN SUBMARINE PIPELINES ON SCOUR PROCESS DUE TO STEADY CURRENT

Author(s)

Emamgholizadeh Baboli M.J. | MOSTAFA GHAREBAGHI A.R. | ABEDI K. | SEDAGHI M.H.

Keywords

PIPELINES

SCOUR PROCESS

VORTEX-INDUCED VIBRATION (VIV)

STEADY CURRENT

TWO DEGREES OF FREEDOM SYSTEM

Abstract

MOST OF THE PREVIOUS STUDIES WERE CONCENTRATED ON VORTEX-INDUCED VIBRATION (VIV) AND SCOUR PROCESS UNDER FIXED PIPELINES OR WITH ONLY ONE DEGREE OF FREEDOM. THE PRESENT STUDY EVALUATES THE SCOUR PROCESS UNDER THE PIPELINE MODEL WITH THE SYSTEM OF TWO DEGREES OF FREEDOM AND UNDER VORTEX-INDUCED VIBRATION (VIV). THE SPEED LIMIT HAS DECREASED (5.06-2.27) AND THE RELATIVE DISTANCE FROM BED IS 0.0, 0.2, 0.5, 1.0, AND 2.0. THE NONCONTACT IMAGE PROCESSING METHOD WAS USED FOR RECORDING THE PIPELINE VIBRATORY RESPONSE. THE LABORATORY RESULTS REVEAL THAT THE RELATIVE DISTANCE FROM BED IS AN IMPORTANT FACTOR IN SCOUR PROCESS SO THAT WITH THE INCREASE OF RELATIVE DISTANCE FROM BED THE SCOUR DEPTH HAS A DECREASING TREND WHICH GROWS WITH ACCELERATION. IN ADDITION, WITH COMPARISON OF DEPTH OF RELATIVE SCOUR ON THE PRESENT RESEARCH (VIBRATORY PIPELINE WITH TWO DEGREES OF TRANSITIVE FREEDOM) WITH PREVIOUS STUDIES (VIBRATORY PIPELINE WITH ONE DEGREE OF TRANSITIVE FREEDOM IN PERPENDICULAR DIRECTION TO THE CURRENT AND FIXED PIPELINE), IT CAN BE CONCLUDED THAT RELEASING ONE VIBRATIONAL CONSTRAINT CAUSES IN DECREASE OF SCOUR DEPTH COMPARED TO THE SITUATION OF ONE DEGREE OF FREEDOM.

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APA: Copy

Emamgholizadeh Baboli, M.J., MOSTAFA GHAREBAGHI, A.R., ABEDI, K., & SEDAGHI, M.H.. (2012). EXPERIMENTAL STUDY OF THE EFFECT OF DEGREES OF FREEDOM IN SUBMARINE PIPELINES ON SCOUR PROCESS DUE TO STEADY CURRENT. INTERNATIONAL CONFERENCE ON COASTS, PORTS AND MARINE STRUCTURES (ICOPMAS). SID. https://sid.ir/paper/907696/en

Vancouver: Copy

Emamgholizadeh Baboli M.J., MOSTAFA GHAREBAGHI A.R., ABEDI K., SEDAGHI M.H.. EXPERIMENTAL STUDY OF THE EFFECT OF DEGREES OF FREEDOM IN SUBMARINE PIPELINES ON SCOUR PROCESS DUE TO STEADY CURRENT. 2012. Available from: https://sid.ir/paper/907696/en

IEEE: Copy

M.J. Emamgholizadeh Baboli, A.R. MOSTAFA GHAREBAGHI, K. ABEDI, and M.H. SEDAGHI, “EXPERIMENTAL STUDY OF THE EFFECT OF DEGREES OF FREEDOM IN SUBMARINE PIPELINES ON SCOUR PROCESS DUE TO STEADY CURRENT,” presented at the INTERNATIONAL CONFERENCE ON COASTS, PORTS AND MARINE STRUCTURES (ICOPMAS). 2012, [Online]. Available: https://sid.ir/paper/907696/en

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