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Abstract
Indonesia’s extensive coastline and tropical climate make it highly vulnerable to flooding, particularly in coastal regions like the Sayung River in Central Java. This study focuses on flood drivers such as land subsidence, sedimentation, and tidal factors, which have caused severe damage to areas like Semarang and Demak. Three analyses were conducted: the first employed an unsteady flow model with upstream discharge (Q25) and downstream tidal input. The second used a quasi-unsteady flow model with daily discharge and tidal input. The third was a 2D simulation predicting conditions for the 10th, 20th, and 50th years, factoring in tides, subsidence, sea level rise, and sedimentation. Sediment control measures for the 10th year include embankment construction and channel maintenance, while medium- and long-term solutions involve implementing a polder system with a weir, spillway, reservoir (+4.85 million m3), and pump capacity (+52.45 m3/s). These integrated approaches provide critical insights for flood management in coastal regions threatened by climate change and land degradation.
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Details
1 Water Resources Engineering Research Group, Faculty of Civil and Environmental Engineering, Bandung Institute of Technology , Jl. Ganesha 10, Bandung, 40132, Indonesia
2 Master of Water Resources Management, Faculty of Civil Engineering and Environmental, Bandung Institute of Technology , Jl. Ganesha 10, Bandung, 40132, Indonesia
3 Center for Research and Development of Water Resources (SDA), Research and Development Agency of the Ministry of Public Works and Public Housing , Indonesia
4 Master of Water Resources Engineering, Faculty of Civil and Environmental Engineering, Bandung Institute of Technology , Jl. Ganesha 10, Bandung, 40132, Indonesia
5 Civil Engineering, Singaperbangsa Karawang University , Karawang, 41361, Indonesia
6 Nagoya Institute of Technology , 466-8555 Nagoya, Japan