Browsing by Subject "Ships"

Sort by: Order: Results:

Now showing items 1-3 of 3
  • Walker Vadillo, Veronica (Southeast Asian Ministers of Education Organization (SEAMEO), Regional Centre for Archaeology and Fine Arts (SPAFA), 2021)
    How did Southeast Asia transform from a hub of prehistoric coastal networks into a transregional interdependent port system by the early modern period? To answer this question, which is crucial to understanding the historical developments of polities along the Indo-Pacific region, this presentation proposes to examine the synergetic nature of shipping infrastructure in order to push current boundaries that place the focus on trade goods.
  • Vanhatalo, Jarno; Huuhtanen, Juri; Bergström, Martin; Helle, Inari; Mäkinen, Jussi Antti-Eerikki; Kujala, Pentti (2021)
    Ships operating in ice-infested Arctic waters are exposed to a range of ship-ice interaction related hazards. One of the most dangerous of these is the possibility of a ship becoming beset in ice, meaning that a ship is surrounded by ice preventing it from maneuvering under its own power. Such a besetting event may not only result in severe operational disruption, but also expose a ship to severe ice loading or cause it to drift towards shallow water. This may cause significant structural damage to a ship and potentially jeopardize its safety. To support safe and sustainable Arctic shipping operations, this article presents a probabilistic approach to assess the probability of a ship becoming beset in ice. To this end, the proposed approach combines different types of data, including Automatic Identification System (AIS) data, satellite ice data, as well as data on real-life ship besetting events. Based on this data, using a hierarchical Bayesian model, the proposed approach calculates the probability of a besetting event as a function of the Polar Ship Category of a ship, sea area, and the distance travelled in the prevailing ice concentration. The utility of the proposed approach, e.g. in supporting spatiotemporal risk assessments of Arctic shipping activities as well as Arctic voyage planning, is demonstrated through a case study in which the approach is applied to ships operating in the Northern Sea Route (NSR) area. The outcomes of the case study indicate that the probability of besetting is strongly dependent on the Polar Ship Category of a ship and that the probability increases significantly with higher ice concentrations. The sea area, on the other hand, does not appear to significantly affect the probability of besetting.
  • Steinby, Christa Margareta (Institutum Romanum Finlandiae, 2020)
    Acta Instituti Romani Finlandiae
    This article sheds light to the literary evidence about ships using the ports of Ostia and Portus from the eight century B.C. to the fourth century A.D. The traffic had many functions: the colonists visiting, the Romans making and utilizing treaties with Carthage about trade and areas of influence in the western Mediterranean, the Roman food transports, the use of warships in Rome’s expansion in the Tiber, along the Italian coast and around the Mediterranean, war booty taken to Rome, Rome as the hub of international relations etc.