Development of Cimanuk River Delta, Indonesia | |
| Author | Yuanita, Nita |
| Call Number | AIT Diss. no.WM-06-03 |
| Subject(s) | Deltas--Indonesia Manuk River Delta (Indonesia) |
| Note | A dissertation submitted in partial fulfillment of the requirements for the degree of Doctor of Engineering in Water Engineering and Management, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Series Statement | Dissertation ; no. WM-06-03 |
| Abstract | Hydrodynamics and sediment-transport simulation are important parts in morphological modeling of river delta with particular reference to Cimanuk Delta in Indonesia. Cimanuk river delta is located in West Java province, about 200 km east of Jakarta, the capital city of Indonesia. The delta is subject to ocean waves of less than 1 m height due to its position in semi-enclosed Java Sea in Indonesian archipelago. The vast extent of the Cimanuk delta in the northern coast of Java, which embraced the new Cimanuk and the Rambatan deltas, has been established over centuries with sediment that was transported to the river mouth of the order of 5 million tones per year. The analysis was carried out by using MIKE-21 model software developed by DHI Water and Environment. In hydrodynamic simulation, water level boundary conditions were generated using 4 principal tidal constituents (M2, S2, K1 and O1) at the boundary, and the Admiralty Method. The simulated tidal constituents were compared with observed data at four calibration stations (Eretan, Balongan, Dadap and Cirebon). In the calibration, the bed roughness parameter was adjusted by trial and error until the most satisfactory results were obtained. It is found that the best value of the bed roughness was 0.1 m. Model performance was then verified with another set of observed water levels. The root mean square error between computed and observed tidal constituents in calibration and verification was in the range of 0.05-0.12 m. For the sediment-transport and morphological model, the calibration parameters (critical bed shear stress for deposition/erosion and erosion coefficient) were adjusted to obtain the most satisfactory results of suspended sediment concentration and volume of deposition. By comparing the computed and observed data in the calibration, the best values of critical bed shear stress for deposition, critical bed shear stress for erosion and erosion coefficient were 0.05 Nm-2, 0.15 Nm-2, and 0.00001 kg m-2s-1. It was found that computed sediment concentrations were generally lower than observed data by an averaged of 20% in calibration, while they were generally higher by an average of 10% in verification. The computed deposition volumes in calibration and verification were higher than the observed deposition volumes by 18% and 29% respectively. Discussions were made on the accuracy of the results. The calibrated model was then used in sensitivity analysis of its parameters. Critical bed shear stress for deposition, critical bed shear stress for erosion and suspended sediment concentration input from the river were found to be the sensitive parameters. The calibrated model was applied to simulate the morphological development of Cimanuk River delta from 1945 to 1963. The results were found to be acceptable. Also the model was used to simulate the recent coastline geometry in 1997, the mode l result showed a reasonable agreement with the observed data. |
| Year | 2006 |
| Corresponding Series Added Entry | Asian Institute of Technology. Dissertation ; no. WM-06-03 |
| Type | Dissertation |
| School | School of Engineering and Technology |
| Department | Department of Civil and Infrastucture Engineering (DCIE) |
| Academic Program/FoS | Water Engineering and Management (WM) |
| Chairperson(s) | Tawatchai Tingsanchali; |
| Examination Committee(s) | Sutat Weesakul ;Preeda Parkpian ;Suphat Vongvisessomjai ;Shibayama, Tomoya; |
| Scholarship Donor(s) | DANIDA Fellowship; |
| Degree | Thesis (Ph.D.) - Asian Institute of Technology, 2006 |