DRY AREA CHANGES ON TIDAL FLAT IN BREBES WATERS, CENTRAL JAVA

• Main Author: WIBOWO (NIM : 12913032), KEVIN
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/28447
• Institution: Institut Teknologi Bandung

Sedimentation process in coastal of Brebes leads to abrasion and accretion along the shoreline. This sedimentation process affect the shoreline. In order to handle the sedimentation problem, the hydrodynamic and sediment transport studies are needed. Therefore, this research carries out a study of dynamics process on early phase and calculation of the dry area of the tidal flat in Brebes shore. <br /> <br /> Two-dimensional hydrodynamic simulation with flood and dry scheme was performed using Mike 21. The simulation was performed for 15 days from June 13th to 30th 2016 and July 18th to August 2nd 2016. There were three model scenarios i.e. the first is using tides forcing, the second is using tides and time-varying wind forcing, and the third is tides with constant wind forcing. Three model scenarios were conducted to see the hydrodynamics condition and tidal flat area changes. Furthermore, the one-year simulation in 2016 was performed using the tides and time-varying wind forcing. The one-year simulation aimed to see the seasonal changes of the tidal flat dry area. <br /> <br /> The comparison between elevation from the model and observation show the RMSE value of 0.0826 m, 0.0815 m, and 0.0802 for scenario 1, 2, and 3 respectively. Moreover, the verification result of zonal (meridional) current component shows the RMSE of the first scenario is 0.089 m/s (0.056 m/s). The second scenario produces RMSE of zonal (meridional) current component of 0.091 m/s (0.054 m/s) and the third of 0.093 m/s (0.054 m/s). The total of dry area changes in the first and second scenarios are decreased 0.0498 km2 and 0.0198 km2, respectively. On the other hand, the third scenario increased 0.0107 km2 of dry area. These results show that extreme wind have an effect on shore hydrodynamics process. <br /> <br /> The one-year simulation in 2016 shows that the total change of dry area decreased by 0.0509 km2. The stronger wind force generates the less of the submerged area and increases the dry area. In the west and east monsoon, dry area on the tidal flat are larger than in transition monsoon.