Record Details

Dredging of sand from a creek adjacent to a sand-spit for reclamation: Its impact on spit stability and coastal zone

DRS at CSIR-National Institute of Oceanography

View Archive Info
 
 
Field Value
 
Title Dredging of sand from a creek adjacent to a sand-spit for reclamation: Its impact on spit stability and coastal zone
 
Creator Rajagopal, M.D.
Vethamony, P.
Ilangovan, D.
Jayakumar, S.
Sudheesh, K.
Murty, K.S.R.
 
Subject coastal zone
sand
dredging
spits
depositional features
land reclamation
hydrodynamics
slope stability
 
Description A quantity of about 17 + 10 sup(6) m sup(3) sand had been dredged from the Jatadharmohan creek (JMC) 15 km south of Paradip Port (east coast of India) in 2000, and a quantity of 14 + 10 sup(6) m sup(3) sand will be dredged again from the same creek bed as fill material for reclamation of a low lying land. MIKE 21 hydrodynamic model was run to evaluate the change in flow pattern due to altered bathymetry, and GALENA to analyse the stability of a spit adjacent to the creek. JMC is a region of divergence, and favours deposition, and this has been confirmed by subsequent monitoring and bathymetry studies. The pre- and post dredging bathymetry of 2000 when compared with the bathymetry of 2005 revealed accumulation of sediments of the order of 2.11 + 10 sup(6) m sup(3) in an area of approx. 4.22 + 10 sup(6) m sup(2). The sediment from the bed to a depth of 3.3 m consists of very loose sand, silt and clay. These materials could be recent deposit transported by flood or static liquefaction during dredging operation. Medium sand is found upto R.L. - 8.15 m below bed level and thereafter a deep deposit of predominantly fine sand upto the 20.0 m. The slope stability results show that the dredged region will be stable, even if it is dredged to a depth of 12.0 m by maintaining a slope of 1:6. The modeling results indicate that there will be no remarkable change in flow pattern when the dredging depth is increased from 3.5 m to 12.0 m, and the spit will also be stable with a safety factor of 3.0 and a slope of 1:6.
 
Date 2008-01-31T07:46:36Z
2008-01-31T07:46:36Z
2007
 
Type Conference Article
 
Identifier Proceedings of the International Maritime-Port Technology and Development Conference. MTEC 2007, 463-469p.
http://drs.nio.org/drs/handle/2264/766
 
Language en
 
Publisher Maritime and Port Authority of Singapore