THE FEASIBILITY STUDY OF BRIDGE DESIGN IN DIGOEL PAPUA N. Retno Setiati
Institute Road of Engineering, Research and Development Agency, The Ministry of Public Works and Public Housing, Indonesia
Abstract
The planning of the bridge construction in Digoel river that connects the western part with the eastern part of Boven Digoel in Papua Province is part of the development program as stipulated in PP No 78 Tahun 2014 about Percepatan Pembangunan Daerah Tertinggal. The land, river, and air transport systems that connect between regions in Boven Digoel are very difficult to reach, other things with extreme weather and climate conditions make the transportation cost in the District is very expensive. One of the efforts made to overcome these problems is the construction of road and bridge infrastructure. To support the implementation of infrastructure development in Boven Digoel, feasibility study of road and bridge planning is required. Feasibility study refers to Pd T-19-2005-B (Studi Kelayakan Proyek Jalan dan Jembatan). A feasibility study was undertaken to analyze in more detail some of the proposed road trace alternatives. Based on the results of the feasibility study, two alternatives of road trails connecting the western part with the eastern part of Boven Digoel of Papua Province. The bridge plans were made across the Digoel river. Bridge construction on alternative road trails connecting Kampung Ampera with Tanah Merah is more effective and efficient to choose. Construction of the bridge at the location is safer than the river scouring hazard. The length of the bridge is made larger than the stretch of the Digoel river. This is due to the Digoel river flow always changing every year. From the results of field measurement analysis, the average speed of the movement of the horizontal river flow direction is (80-180) x10(-4) meters / day so that in the 50-year period, the movement speed of the horizontal river flow path becomes (160 - 3200) meters. Based on Kun Qarshov method, the movement of the river flow for 50 years at the location of the bridge connecting Tanah Merah through Ampera Village is 311.64 meters so that the optimum bridge length at the location is designed 600 meters.
Keywords: Digoel, Boven Digoel, river flow, scouring, span
