Scouring and sedimentation effects on the seabed induced by ship propellers during ship manoeuvring near harbour structures affect both structure stability and ship manoeuvring capabilities. This contribution proposes solutions at an operational level using the automatic identification system (AIS) and a bridge simulator. Two new alternative manoeuvres were designed and tested on a bridge simulator to obtain expected maximum scour depth and the results were compared with that of real manoeuvres (i) using mooring lines, and (ii) with tug assistance. A total of 42 test scenarios combining several manoeuvres and meteorological conditions were reproduced. Results confirmed a clear reduction in erosion depth with the alternative manoeuvres, with total reduction when using the tugboat. The presented methodology can be very useful to port authorities to prevent the effects of ship erosion on harbour infrastructures.

The port of Charlotte Amalie on St. Thomas has long been a vibrant centre for ship trafficking in the Caribbean, as it was during Danish colonial rule starting in 1672. In 1917, Denmark officially sold and left what became the US Virgin Islands. Not everybody left, though. The Danish-owned West Indian Company, which owned the majority of the St. Thomas port and its attendant facilities, stayed until 1993. At that point the harbour was sold to the Virgin Islanders, who for some time had complained about the fact that a Danish company still profited from the islands. The harbour of Charlotte Amalie, which is my central analytical unit here, thus provides a lens through which to approach Danish colonial imprints.

The harbour is and has been characterised by activities of a temporary and opportunistic kind: industries blossom, people and crops from far away get uprooted and replanted in the Caribbean, businesses provide work for locals, goods are shipped out to be consumed in other places. The transitory nature of projects designed by people elsewhere, I argue, is part of what colonialism is. As I will show, the traces of such projects appear not only as particular ecologies but also as dilemmas to be grappled with long after the foreign decision-makers have left. My approach to colonial legacies on the Virgin Islands, then, mobilises the shifting flows of people, commodities, and interests shipped in and out of Charlotte Amalie to leave behind altered landscapes that are continuously debated.

Jassa slatteryi is reported for the first time in Mar del Plata harbour, Argentina. A morphological comparison with the original description and a genetic analysis are made to corroborate the identification of specimens. The report of range expansion along the South-western Atlantic coast is discussed.

The distribution range of several species of Ascidiacea is expanding due to human-based transportation between biogeographical regions. Ship movement in Brazil has increased over the past few years due to world commerce and oil exploration, which has increased the number of species transported and introduced to new areas. This ship movement has made harbour areas a suitable place to detect the introduction of many species. In this work, we report the first record in the south-west Atlantic of the solitary Ascidiacea Rhodosoma turcicum. This species has been recorded since 2009 at Forno Harbour, in Arraial do Cabo, but exclusively inside cages protected from predators. This suggests biological control of the species is preventing its spread throughout the area.

In this neat investigation of a harbour site, the authors show how much can be learnt by site survey — and by surface plotting and remote mapping in particular. Here the excavations are used to pilot the geophysics, rather than the other way round, and ground-penetrating radar is employed to show not just where features are, but their sequence and their current vulnerability. This exemplary project demonstrates how, in modern approaches to fieldwork, sites are to be studied rather than excavated, comprehended rather than stripped.

When anchorages are arranged in a harbour, the manoeuvering difficulty of a ship navigating between anchored ships should be considered. However, until now, nobody has researched how to design the arrangement of anchorages from the viewpoint of manoeuvering difficulty. In this paper, the relationship between the arrangement of anchorages and manoeuvering difficulty is systematically analysed by applying the Environmental Stress Model to the problems of a ship navigating between anchored ships. Based on this analysis, a method of designing the arrangement of anchorages is considered that ensures manoeuvering difficulty is at an acceptable level for mariners. The distance needed between the anchored ships has been proposed to accord with the length of the navigating ship and the mean length of anchored ships.