Erosion is one of main problem in coastal area. Currently, natural coastal protection using vegetation such as mangrove is preferable in many places in the world (Othman, 1994; Gedan et al., 2010). However there are challenges in development of this natural coastal protection, e.g. mangrove-trees have been damaged by the waves or current, before they are growth strongly. This study focused on a combination of main natural protection and temporary manmade structures. The main protection consists of mangrove plant vegetation, expected to serve long-term protection. While temporary structure is designed to protect the growth of young mangrove from the waves and erosion, it is designed as a non-conventional rubble mound structure made of geobag with a design life is determined by growth period of mangrove seeds. The concept design criteria is considered suitable for the remote area 1) low cost; 2) manually constructed; and 3) mangrove as the main protections.
Ocean Engineering, Faculty of Civil and Environmental Engineering, Institut Teknologi Bandung, Indonesia
Balikpapan Bay is an important and dangerous due to five oil subsea pipelines divide the waters of Balikpapan-Penajam Paser Utara to supplied crude oil to Refinery Unit V Balikpapan. In the end of April 2018, one of the subsea pipelines was damaged caused more than 40,000-barrel spill at the Balikpapan bay. It was suspected due to anchor load of a ship. This paper discusses the effect of anchor load on a damaged subsea pipeline in the bay of Balikpapan. In this study, data was collected from many resources and simulated using Subsea Pipeline Pro Software. The simulation results are compared to the field data where the subsea pipeline shifts about 113 meters from its original position by forming V shaped with a degree of 61.
Ocean and Aerospace Research Institute, Indonesia
Mechanical Engineering, University Teknologi Malaysia, Malaysia
The evaluation of principal dimensions of a Floating Production, Storage and Offloading (FPSO) system is one of the most critical tasks at the initial design stage of the vessel. It is therefore important to get this right from the onset. This paper presents a simple method of determining the optimal principal dimensions of FPSO vessels of any specified oil storage capacity. An Optimal Design Programme (OPTIMAP) has therefore been developed to analyze and compare the various responses of floating production vessels with the aim of selecting the best possible design to ensure not only a reduction in cost of construction, but also to maintain a safe operation and overall optimal performance of the vessel with regards to her dynamic responses in deep sea waves.
Department of Marine Engineering, Rivers State University, Port Harcourt, Nigeria
