NUMERICAL MODELING: THE EFFECT OF LAND SUBSIDENCE ON HYDRODYNAMIC AND MORPHOLOGY CONDITIONS IN PEKALONGAN
The tidal flood that occurs in Pekalongan has frequent and repeated intensity at the highest tide conditions so that it can damage infrastructure and residential buildings resulting in substantial material losses. Land subsidence in Pekalongan ranges from 4.8 – 10.8 cm per year which is mostly cause...
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| Format: | Theses |
| Language: | Indonesia |
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| Online Access: | https://digilib.itb.ac.id/gdl/view/57141 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | The tidal flood that occurs in Pekalongan has frequent and repeated intensity at the highest tide conditions so that it can damage infrastructure and residential buildings resulting in substantial material losses. Land subsidence in Pekalongan ranges from 4.8 – 10.8 cm per year which is mostly caused by water well drilling. In addition to land subsidence, changes in coastline due to erosion also occur on the coast of Pekalongan. By knowing the effect of subsidence on morphological and hydrodynamic characteristics, it can be analyzed whether land subsidence is the dominant factor causing tidal flooding in Pekalongan and alternative solutions to prevent and cope with tidal flooding. There are 2 modeling scenarios, the scenario before the land subsidence in 2016 (scenario 1) and the existing scenario (scenario 2) using MIKE21. Calibration was carried out on the water level elevation and current velocity based on the variation of the chezy number, the smallest error was obtained at the chezy number 50 m0.5/s. Five review points CR1, CR3, CR7, ST1, and ST2 were selected. The results of the comparison of the simulation models of the two scenarios show that the CR1 point experiences sedimentation of 10.3 mm, at the other points it experiences erosion with values of 10.7 mm, 32.7 mm, 42.3 mm, and 49.2 mm, respectively. The current velocity in scenario 1 is greater than scenario 2 with a ratio of 20% with the same current pattern. Land subsidence affects the current velocity and increases the rate of sedimentation.
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