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ITS » Paper and Presentation » Manajemen & Rekayasa Sumber Air S2
Posted by anisw@its.ac.id at 24/05/2016 14:28:32  •  552 Views


SEDIMENTATION STUDY OF REJOSO JETTY USING NUMERICAL MODEL

STUDI SEDIMENTASI PADA JETTY REJOSO DENGAN MENGGUNAKAN MODEL NUMERIK

Author :
FAUZI, ARDIANSYAH ( 3112205001 )




ABSTRAK

Public Works Department of East Java Province Indonesia proposed the construction of jetty in Rejoso River to prevent siltation problem in estuary due to sedimentation process. The construction of this jetty is proposed as one solution of this sedimentation problem. It needs to be researched or studied foor charactheristics of river mouth sedimentation current pattern and water level changes in the vicinity of Rejoso estuary as effect of jetty construction. The objective of this research is to investigate the effect of jetty construction in sedimentation current pattern and water level changes using numerical models which are 2D numerical model RMA2 Resources Management Associates and SED2D-WES. RMA2 is used to generate water surface elevations and velocities. SED2D-WES is used to simulate bed elevation changes due to sediment transport. The simulation has been done in 4 conditions which are in existing proposed jetty length 1170 m jetty length 585 m and jetty length 585 m with constrained condition. From the calibration process it is used eddy viscosity coefficient and Mannings value 4000 Pa-sec and 0.03 respectively. The result of calibration shows good agreement between model and observation with R value 0.996 0.9477 and 0.8143 for water level current velocity in station 1 and current velocity in station 2 respectively. From 3 jetty scenario it provides weakness and advantages. If using jetty length 1170 m it will good in moving sediment deposition from estuary to the offshore but the length of jetty is no need that long because Rejoso estuary is river dominated and also the longshore sediment transport is difficult to move bypass the jetty. If using jetty length 585 m with unconstrained the velocity and the water surface elevation changes in the river is not much different with jetty length 1170 it is showed that with jetty length 50 from proposed design is enough to maintain condition in the river. If using jetty length 585 m with constrained the velocity in the river is higher up to twice than the other simulations but the changes of water surface elevation in the river is need to be noticed. The length of jetty with 556 m can be better than original design. From sedimentation rate inside the jetty it can be conclused that the high velocity inside the jetty can successfully pushed the sediment out of jetty.


ABSTRACT

Public Works Department of East Java Province Indonesia proposed the construction of jetty in Rejoso River to prevent siltation problem in estuary due to sedimentation process. The construction of this jetty is proposed as one solution of this sedimentation problem. It needs to be researched or studied foor charactheristics of river mouth sedimentation current pattern and water level changes in the vicinity of Rejoso estuary as effect of jetty construction. The objective of this research is to investigate the effect of jetty construction in sedimentation current pattern and water level changes using numerical models which are 2D numerical model RMA2 Resources Management Associates and SED2D-WES. RMA2 is used to generate water surface elevations and velocities. SED2D-WES is used to simulate bed elevation changes due to sediment transport. The simulation has been done in 4 conditions which are in existing proposed jetty length 1170 m jetty length 585 m and jetty length 585 m with constrained condition. From the calibration process it is used eddy viscosity coefficient and Manning value 4000 Pa-sec and 0.03 respectively. The result of calibration shows good agreement between model and observation with R value 0.996 0.9477 and 0.8143 for water level current velocity in station 1 and current velocity in station 2 respectively. From 3 jetty scenario it provides weakness and advantages. If using jetty length 1170 m it will good in moving sediment deposition from estuary to the offshore but the length of jetty is no need that long because Rejoso estuary is river dominated and also the longshore sediment transport is difficult to move bypass the jetty. If using jetty length 585 m with unconstrained the velocity and the water surface elevation changes in the river is not much different with jetty length 1170 it is showed that with jetty length 50 from proposed design is enough to maintain condition in the river. If using jetty length 585 m with constrained the velocity in the river is higher up to twice than the other simulations but the changes of water surface elevation in the river is need to be noticed.The length of jetty with 556 m can be better than original design. From sedimentation rate inside the jetty it can be conclused that the high velocity inside the jetty can successfully pushed the sediment out of jetty.



KeywordsJett; RMA2; SED2D-WES; Hydrodynamics; Sediment
 
Subject:  None
Contributor
  1. Prof. Mukand S. Babel
  2. Dr. Sutat Weesakul
Date Create: 20/01/2015
Type: Text
Format: pdf
Language: Indonesian
Identifier: ITS-paper-31121160008986
Collection ID: 31121160008986
Call Number: RTS 551.303 Fau s


Source
Paper and Presentations, Civil Engineering, RTS 551.303 Fau s, 2015

Coverage
ITS Community

Rights
Copyright @2016 by ITS Library. This publication is protected by copyright and per obtained from the ITS Library prior to any prohibited reproduction, storage in a re transmission in any form or by any means, electronic, mechanical, photocopying, reco For information regarding permission(s), write to ITS Library




[ Download - Open Access ]

  1.  ITS-paper-41602-3112205001-paperpdf.pdf - 1950 KB
  2.  ITS-paper-41602-3112205001-presentationpdf.pdf - 3906 KB




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