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Paper Information

Title: 

MORPHOLOGICAL CONTROL OF ESTUARINE CHANNEL USING TIDAL ASYMMETRY CHARACTERISTICS

Type: PAPER
Author(s): SIVAKHOLUNDU K.M.,MANI J.S.,KATHIROLI S.,IDICHANDY V.G.
 
 
 
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:  2008Volume 8
 
 
Abstract: 

TIDAL ASYMMETRY IS PRESENT IN A NATURAL ESTUARINE CHANNEL THAT CAUSES FLOOD AND EBB FLOWS TO BE DIFFERENT. THE DIFFERENCE IN MAGNITUDE AS WELL AS DURATION BETWEEN FLOOD AND EBB PHASES LEADS TO NET SEDIMENT TRANSPORT WITHIN AN ESTUARY. IN AN UNSTABILIZED NAVIGATIONAL CHANNEL, THE MORPHOLOGY KEEPS EVOLVING BY MOVING LARGE QUANTITIES OF SEDIMENT BY ERODING AND DEPOSITING AT DIFFERENT LOCATIONS THROUGH ASYMMETRIC FLOW FIELD. THIS STUDY RELATES THE PROCESSES OF TIDAL ASYMMETRY, SEDIMENT TRANSPORT AND MORPHOLOGY ON A SMALL SCALE SUITABLE FOR ENGINEERING INTERVENTION TO STABILIZE A PORTION OF CHANNEL IN AN ESTUARY SITUATED IN SEMIDIURNAL TIDAL REGIME.
THE FORMULA PROPOSED BY KREEKE AND ROBACZEWSKA (1993) IS USED WITH MINOR MODIFICATIONS AND THE EFFECT OF ASYMMETRY ON SEDIMENT TRANSPORT IS QUANTIFIED. USING NUMERICAL MODEL, THE METHOD IS EXTENDED TO DESIGN A STABILIZATION SCHEME THAT RELATES THE CHANNEL GEOMETRY AND FLOW CONFIGURATIONS TO THE MORPHOLOGICAL EVOLUTION THROUGH TIDAL ASYMMETRY CHARACTERISTICS.
AS A FIELD APPLICATION, THIS METHOD WAS TRIED OUT ON HOOGHLY ESTUARY IN INDIA; THE RESULTS SHOW THAT ASYMMETRIC CHARACTERIZATION IS HELPFUL TO UNDERSTAND THE MORPHOLOGICAL EVOLUTION AS WELL AS REACHING A SUITABLE CHANNEL CONFIGURATION WITH IMPROVED STABILITY.

 
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