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Management Of Shoreline Morphological Changes Consequent To Breakwater Construction

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Title Management Of Shoreline Morphological Changes Consequent To Breakwater Construction
 
Creator Noujas, V.
Thomas, K.V.
Nair, L. Sheela
Hameed, T.S.S.
Badarees, K.O.
Ajeesh, N. R.
 
Subject Wave
Profile
Shoreline Changes
Breakwater
Modeling
 
Description 54-61
The coastal stretch from Veli to Varkala
along Thiruvananthapuram coast, which was in dynamic equilibrium, has two
identifiable sediment cells separated by the Muthalapozhi inlet with harbour
breakwaters on either side of the inlet. Construction of breakwaters to develop
a fishing harbour at Muthalapozhi has caused erosion immediately north of the inlet
and beach build up south of the inlet. In addition, the harbour mouth gets
blocked due to deposition of sand, virtually making the harbour unusable. In
the present study, the processes of shoreline morphological changes along the high
energy coast are analyzed using numerical models to propose management options
to tackle morphological modifications. Shoreline changes, nearshore processes
and beach characteristics along this sector are studied through extensive field
observations. The data is used to calibrate and validate sediment transport and
shoreline change models for this coast. Sediment transport and shoreline
changes are simulated using different modules of LITPACK model. The LITDRIFT
module is used to calculate annual sediment transport. The LITLINE module is
used for shoreline evolution during fair season and the behaviour of coast
during monsoon is simulated using the module LITPROF. The calibration of the
model is done with field observations. It is found that beach sediments get
deposited on southern side of the breakwater and bypassed sediment gets
deposited at the inlet mouth. The model after validation is used to simulate
the processes with different designs and a groin field of smaller transitional
lengths comparable with the surf zone width.

The groins having lengths 40, 30 and 20 m
at 120, 220 and 300 m south of breakwater, has been found best suited to control
the chocking of harbour mouth due to sediment deposition during beach building
period.
 
Date 2014-02-05T09:28:21Z
2014-02-05T09:28:21Z
2014-01
 
Type Article
 
Identifier 0975-1033 (Online); 0379-5136 (Print)
http://hdl.handle.net/123456789/26426
 
Language en_US
 
Rights CC Attribution-Noncommercial-No Derivative Works 2.5 India
 
Publisher NISCAIR-CSIR, India
 
Source IJMS Vol.43(1) [January 2014]