Analisis Perilaku Banjir Bandang Akibat Keruntuhan Bendungan Alam pada Daerah Aliran Sungai Krueng Teungku Provinsi Aceh

• Main Authors: Azmeri, Alfiansyah Yulianur, Vina Listia
• Format: Article
• Language: English
• Published: Institut Teknologi Bandung 2015-12-01
• Series: Jurnal Teknik Sipil
• Subjects: Flash flood; Natural dam; Krueng teungku watershed; Overtopping
• Online Access: http://journals.itb.ac.id/index.php/jts/article/view/2909/1493
• ISSN: 0853-2982; 2549-2659

In the period of the last fifteen years, there has occurred three times of the flood disasters (in the year of 1987, 2000, and 2013) at the watershed of Krueng Teungku. Incident on January 2nd, 2013 gave a big impact on Beureuneut village at Seulimeum sub-district of Aceh Besar regency. This study aims to analyze flash flood behavior due to the collapse of the natural dam by performing the dam-break simulation model. The research methodology includes analysis of hydrological based on extreme rainfall on the date of occurrence about 125 mm which produced discharge flood peak as high as 334.83 m3/sec. Hydraulics analysis conducted on the geometry of the river, natural dam with topographical and manning’s roughness coefficient estimate approaches. The flash floods modeling simulation as result of the natural dam break caused by overtopping and piping uses HEC-RAS 4.1.0 software. Based on the validation of the flood elevation between modeling and field observations, natural dam of Krueng Tengku was collapsed due to overtopping. The result of simulation obtains the arrival time of the flood from upstream to downstream about 1,104 hours. Volume damming about 13.110,32 m3 resulted in inundation height between 1 to 2 meters. These losses are in residential areas, plantations and farm communities. Flood behavior information is useful to enhance the capacity to minimize the impact of flash flood disasters.