Alongshore Sediment Transport Near Tidal Inlets of Chilika Lagoon; East Coast of India

Chilika, a lagoon along the east coast of India, is undergoing transformation due to frequent shoreline change near inlet(s). Shoreline change near inlet includes change in position and shape of inlet, inlet channel length, and spit growth/erosion. These variable features of lagoon inlet(s) critical...

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Bibliographic Details
Published in:Marine geodesy 2017-05, Vol.40 (2-3), p.187-203
Main Authors: Pradhan, Subhasis, Mishra, Sujit Kumar, Baral, Rakesh, Samal, Rabindro Nath, Mohanty, Pratap Kumar
Format: Article
Language:English
Subjects:
Bathymetry
Beach profile
Beach profiles
Beaches
coastal lagoon
Coastal lagoons
Coastal zone management
Coasts
Computer simulation
Discharge
Drift
Erosion
Frameworks
Genetic transformation
Grain size
Growth
inlet migration
Inlets
Inlets (topography)
Inlets (waterways)
Integration
Length
Littoral drift
Longshore sediment transport
Mathematical analysis
Mathematical models
Migration
MIKE 21
Particle size
Sand
Seasonal variation
Sediment
Sediment transport
Shape
shoreline change
Shorelines
Soil erosion
Spatial variability
Spatial variations
Spectra
spectral wave model
Spits
Stability
Temporal variability
Temporal variations
Tidal inlets
Transport
Variability
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Summary:Chilika, a lagoon along the east coast of India, is undergoing transformation due to frequent shoreline change near inlet(s). Shoreline change near inlet includes change in position and shape of inlet, inlet channel length, and spit growth/erosion. These variable features of lagoon inlet(s) critically depend on alongshore sediment transport (LST) and discharge (water and sediment) from the lagoon to the sea. The LST and the processes responsible for sand spit growth/erosion, considered as important attributes of inlet stability, are the subject matter of the present investigation and hence the study assumes importance. The study includes integration of observational and modeling framework. Observations include nearshore wave, bathymetry, beach profile, shoreline and sediment grain size of spits while numerical modeling includes simulation of the wave using MIKE 21 Spectral Wave model and LST simulation using LITtoral DRIFT. The results indicate that the predominant wave directions as S and SSE, which induces round the year south to north alongshore transport with significant seasonal variation in magnitude. The estimated LST closely matches with previous studies near Chilika inlet and for other locations along the Odisha coast. Besides temporal variability, the study reveals spatial variability in alongshore transport near Chilika inlet and considers it as one of the important attributes along with northward spit growth for inlet migration/closure/opening.
ISSN:0149-0419
1521-060X
DOI:10.1080/01490419.2017.1299059