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Stability of a sand spit due to dredging in an adjacent creek

DRS at CSIR-National Institute of Oceanography

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Title Stability of a sand spit due to dredging in an adjacent creek
 
Creator Patgaonkar, R.S.
Ilangovan, D.
Vethamony, P.
Babu, M.T.
Jayakumar, S.
Rajagopal, M.D.
 
Subject Jatadharmohan creek
hydrodynamic modelling
sand spit stability
safety factor
 
Description The Jatadharmohan creek lies between Mahanadi and Devi Rivers along the Orissa coast and it is separated from the sea by an elongated sand spit. It was proposed to mine a volume of 15 x 10 sup(6) m³ of sand from the creek for land filling, but maintaining the spit intact. For this, the stability of sand spit is studied with different criteria. The results confirm that the creek mouth is a near permanent zone of deposition. The model results obtained for various depth scenarios show that the magnitude of currents would increase considerably when depth is increased by 7.0m and marginally for further increase in depth by 10.0m. Accordingly, a dredging scheme has to be designed without affecting the spit stability. Considering the existing hydrodynamics in the creek system, it is recommended that a bed slope of 1:6 (9.5°) be maintained during dredging, which is much less than 13.75° - the evaluated critical slope at the site when seepage flow is parallel to the bed slope. It is observed during monitoring that the creek is very productive, and the sand spit is totally intact.
 
Date 2007-04-16T04:56:46Z
2007-04-16T04:56:46Z
2007
 
Type Journal Article
 
Identifier Ocean Engineering, vol.34(3-4), 638-634p.
http://drs.nio.org/drs/handle/2264/592
 
Language en
 
Rights An edited version of this paper was published by Elsevier. Copyright [2007] Elsevier
 
Format 312430 bytes
application/pdf
 
Publisher Elsevier