Pushidrosal has prepared safe roads for Lombok and the Sunda Strait
The Indonesian Hydrographic Office (Pushidrosal) conducted extensive hydrographic surveys between 2016 and 2017 to achieve full coverage of bathymetry and other required hydro-oceanographic data of the Sunda Strait and Lombok Strait. The survey used modern methods and equipment from KRI RIGEL – 933 and KRI SPICA – 934, not only for study material and design exercises for the new traffic separation schemes (TSS), but also for provide a high level of confidence for international navigation in the two straits.
New TSS and other routing measures in the Sunda Strait and Lombok Strait, all in accordance with the United Nations Convention on the Law of the Sea (UNCLOS) 1982 and adopted by the IMO, will come into effect. effective July 1, 2020. The implementation of the TSS over the Sunda Strait and Lombok Strait will improve the safety of navigation through it, while protecting the marine environment. Although there are nine global choke points in international shipping lanes, the Sunda Strait and Lombok Strait are part of four choke points located in Indonesia. In addition, the existence of TSS will make it easier to monitor traffic passing through “two of the nine major bottlenecks” around the world, so that traffic management can be more easily implemented.
A 100% coverage hydrographic survey was carried out to improve the Confidence Zone Category (CATZOC) and to support the establishment of the new TSS. Pushidrosal has also prepared an information document regarding the baseline status and provision of modern nautical charts covering the Indonesian archipelagic sea lanes.
Pushidrosal also conducted an additional hydrographic survey at Anak Krakatoa after the tsunami incident in 2018 to assess any changes in depth that would affect the safety of navigation in the vicinity of the TSS and the Archipelagic Seaway. However, so far there is no evidence of changes in depth around the Sunda Strait shipping route, particularly in the TSS and the Archipelagic Seaway. The distance between TSS and Anak Krakatoa is approximately 40 km, and hydrographic survey results show that changes in depth are only visible up to 2 km from the shore near Anak Krakatoa, caused by partial collapse due to the volcanic eruption. In addition, hydrographic data records of several decades indicate that there are no significant differences in depth which are essential for safe navigation.
The IMO-adopted TSS that will come into effect on July 1, 2020 serves as a guide to help ships navigate safely by providing clear navigation routes that prevent the ship from approaching shallow water. The dividing line between the two routes should prevent collisions between ships coming from one direction from Merak to Bakaheuni in the Sunda Strait and from the other direction from Pandangbay to Lembar in the Lombok Strait. A collision in the area of intersection of the road is avoided thanks to the existence of precautionary zones, which sensitize the ship captains, thus minimizing the risk of collision.