STUDY OF PIERS CONFIGURATION ON THE CIUJUNG BRIDGE TANGERANG-MERAK TOLL ROAD AND ITS EFFECT TO THE MORPHOLOGY RIVER

• Main Author: Silvia Pamungkas, Gita
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/70751
• Institution: Institut Teknologi Bandung

The Ciujung River is one of the most strategic rivers in Banten Province, functioning as a natural drainage system, water supply, irrigation, flood control, and the main highway to the airport and main seaport. However, one of the highest risk problems that can arise is the collapse of the Ciujung Bridge on the Tangerang-Merak toll road. Although important, there has been no previous research that addresses the potential dangers of this bridge failure. This study examines flood flows and flow patterns around the Ciujung Bridge based on field observations, secondary data, and mathematical modeling results. The flow pattern will be predicted using the Hecras 6.3 model for unsteady 2D flows. Hydrographs will be made based on SNI 2415:2016 for 25 year and 100 year return period flood discharges. The model results will be compared with field data from the previous extreme flood event in 2013. Based on the results of this model, it can be discussed the potential for morphological changes around the bridge piles that can be used to reduce the risk of bridge failure or riverbank erosion. The results of this study can be used to inform decision-making regarding the maintenance and management of the Ciujung Bridge, including the identification of potential flood-prone areas and the implementation of structural and non-structural measures needed to mitigate flood risks. In addition, this study will provide valuable information for the design and construction of future infrastructure projects in the region, including the development of more resilient and sustainable river management strategies. In addition, it will assist in understanding flow dynamics in this important river system, which has a key role in providing important services to the surrounding communities. This can help better land use planning, development, and risk management to protect human life and property. The analysis of this study results in the maximum velocity in the area around the bridge in the existing conditions with a return period of 25 years is 3.110 m/s to 3.320 m/s, and the velocity in the discharge period of 100 years is 3.248 m/s to 3.444 m /s. While in the condition after the addition of pillars with a 25 year return period discharge is 3.105 m/s to 3.318 m/s and for a 100 year return period discharge is 3.265 m/s to 3.444 m/s. Meanwhile the total amount of local scour that occurred on each pillar with the existing conditions at the 25 year return period discharge was 17.36 m with no scour abutments, because the flow did not become abutments. The total local scour depth at 100 year return period discharge is 24.99 m with flow affected abutments. Meanwhile, the total local scour that occurred after the addition of pillars at the 25-year return period discharge was 47.28 m. The total local scour depth at the 100 year return period discharge is 52.95 m. In conclusion, this study aims to fill the knowledge gap about the potential danger of bridge failure on the Ciujung River and provide valuable information for flood risk management and mitigation in the region. The findings of this research can be used to support sustainable development in the area and to ensure the safety and well-being of local communities.