Sedimentation study of Rejoso Jetty using numerical model | |
| Author | Fauzi, Ardiansyah |
| Call Number | AIT Thesis no.WM-14-11 |
| Subject(s) | Jetties Hydrodynamics Sediment transport |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering in Water Engineering and Management |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. WM-14-11 |
| Abstract | Public Works Department of East Java Province, Indonesia p roposed 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 resear ch ed or stud ied foor cha ractheristics 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, cur rent pattern, and water level changes using numerical model s 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 ch anges 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 viscosi ty coefficient and Manning’s 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 estua ry 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 lengt h 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 simulation s , 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. |
| Year | 2014 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. WM-14-11 |
| Type | Thesis |
| School | School of Engineering and Technology |
| Department | Department of Civil and Infrastucture Engineering (DCIE) |
| Academic Program/FoS | Water Engineering and Management (WM) |
| Chairperson(s) | Babel, Mukand Singh |
| Examination Committee(s) | Sutat Weesakul;Shrestha, Sangam;Kawasaki, Akiyuki |
| Scholarship Donor(s) | Dual Degree ITS/Directorate of Higher Education (DIKTI);Ministry of Education and Culture, Indonesia – AIT Fellowship |
| Degree | Thesis (M. Eng.) - Asian Institute of Technology, 2014 |