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Branch Dock
A branch dock is a dock that forms part of a large harbour system of interlinked docks. Branch docks are terminal branches of a main floating dock. They are ''not'' isolated from the main dock by gates or locks and they share the same water level. Where docks join other docks or basins through gates, these are usually given a distinct name rather than being termed a 'branch'. Floating docks that are separated from tidal waters by a half tide dock commonly have related names such as Sandon Dock and Sandon Half Tide Dock. Branch docks are usually numbered, following the name of their main dock, i.e. ' Gladstone Number Three Branch Dock', rather than individually named. The purpose of a branch dock is to increase the quayside frontage and space for warehouses, for a given volume of water,The cost of excavation for a dock is roughly proportional to its volume. and without requiring the cost and complexity of more locks. Branch docks first appeared in the 18th century, but their he ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dock (maritime)
A dock (from Dutch ''dok'') is the area of water between or next to one or a group of human-made structures that are involved in the handling of boats or ships (usually on or near a shore) or such structures themselves. The exact meaning varies among different variants of the English language. "Dock" may also refer to a dockyard (also known as a shipyard) where the loading, unloading, building, or repairing of ships occurs. History The earliest known docks were those discovered in Wadi al-Jarf, an ancient Egyptian harbor, of Pharaoh Khufu, dating from c.2500 BC located on the Red Sea coast. Archaeologists also discovered anchors and storage jars near the site. A dock from Lothal in India dates from 2400 BC and was located away from the main current to avoid deposition of silt. Modern oceanographers have observed that the ancient Harappans must have possessed great knowledge relating to tides in order to build such a dock on the ever-shifting course of the Saba ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Floating Dock (impounded)
A floating dock, floating harbour or wet dock is a dock alongside a tidal waterway which maintains a 'constant' level, despite the changing tides. Operation At the most basic level, a floating dock is isolated from tidal water by a lock gate, at least, although in many dock systems the entrance is more complex than this. Development and early docks London The first wet dock was Howland Great Wet Dock or Greenland Dock, built in London at the end of the 17th century. This was not a commercial dock and had no warehouses, but was intended solely for ship replenishment and refitting. Liverpool (Old Dock) In 1715 the first commercial wet dock, Liverpool's Old Dock, opened. Early docks were of simple construction: a single lock gate isolating them from the tidal water. The gates were opened during the last hour r twoof the rising tide, giving a short window of opportunity to let ships in on the rise and releasing outgoing ships while the tide was on the turn. The gates ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lock Gate
A lock is a device used for raising and lowering boats, ships and other watercraft between stretches of water of different levels on river and canal waterways. The distinguishing feature of a lock is a fixed chamber in which the water level can be varied; whereas in a caisson lock, a boat lift, or on a canal inclined plane, it is the chamber itself (usually then called a caisson) that rises and falls. Locks are used to make a river more easily navigable, or to allow a canal to cross land that is not level. Later canals used more and larger locks to allow a more direct route to be taken. Pound lock A ''pound lock'' is most commonly used on canals and rivers today. A pound lock has a chamber with gates at both ends that control the level of water in the pound. In contrast, an earlier design with a single gate was known as a flash lock. Pound locks were first used in China during the Song Dynasty (960–1279 AD), having been pioneered by the Song politician and naval en ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lock (water Transport)
A lock is a device used for raising and lowering boats, ships and other watercraft between stretches of water of different levels on river and canal waterways. The distinguishing feature of a lock is a fixed chamber in which the water level can be varied; whereas in a caisson lock, a boat lift, or on a canal inclined plane, it is the chamber itself (usually then called a caisson) that rises and falls. Locks are used to make a river more easily navigable, or to allow a canal to cross land that is not level. Later canals used more and larger locks to allow a more direct route to be taken. Pound lock A ''pound lock'' is most commonly used on canals and rivers today. A pound lock has a chamber with gates at both ends that control the level of water in the pound. In contrast, an earlier design with a single gate was known as a flash lock. Pound locks were first used in China during the Song Dynasty (960–1279 AD), having been pioneered by the Song politician and nava ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tides
Tides are the rise and fall of sea levels caused by the combined effects of the gravitational forces exerted by the Moon (and to a much lesser extent, the Sun) and are also caused by the Earth and Moon orbiting one another. Tide tables can be used for any given locale to find the predicted times and amplitude (or " tidal range"). The predictions are influenced by many factors including the alignment of the Sun and Moon, the phase and amplitude of the tide (pattern of tides in the deep ocean), the amphidromic systems of the oceans, and the shape of the coastline and near-shore bathymetry (see '' Timing''). They are however only predictions, the actual time and height of the tide is affected by wind and atmospheric pressure. Many shorelines experience semi-diurnal tides—two nearly equal high and low tides each day. Other locations have a diurnal tide—one high and low tide each day. A "mixed tide"—two uneven magnitude tides a day—is a third regular category. Tides ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Half Tide Dock
A half tide dock is a partially tidal dock. Typically the dock is entered at high tide. As the tide ebbs a sill or weir prevents the level dropping below a certain point, meaning that the ships in the dock remain afloat, although they still rise and fall with the tides above this. Half tide docks are particularly useful in areas with a large tidal range. The sill of a half tide dock must be set sufficiently far below the daily high tide mark to allow ships to pass over it. Obviously this was easier to achieve with small ships of shallow draught, or in areas with a large tidal range. Inside the dock, the depth of water beneath the sill's level depends only on the depth to which the dock was excavated, although this obviously increases construction costs. The importance of the sill, and the tide's height above it, is reflected by these dock sills becoming an important local datum level and for tide tables being calculated for heights above it (i.e. clear draught in and out of the do ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sandon Dock
Sandon Dock was a dock on the River Mersey, England, and part of the Port of Liverpool. Situated in the northern dock system, it was east of Sandon Half Tide Dock, to which it was once connected. History It was designed by Jesse Hartley and opened in 1851. Originally the dock basin was considerably larger and consisted of six graving docks to the north. Sandon and Canada Dock Goods railway station was situated adjacent to the dock, and opened by the Midland Railway in 1873. The goods station could be accessed via the Huskisson Goods Tunnel, which was opened by the Cheshire Lines Committee in 1882 and closed in 1969. The goods station continued being used until 21 July 1969, and was later demolished. Sandon Dock railway station, between the dock and the goods station, was opened by the Liverpool Overhead Railway in 1893 and was closed before May 1896. When Sandon Half Tide Dock was created at the turn of the 20th century, the remaining area was enclosed as Sandon Dock. After ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sandon Half Tide Dock
Sandon Half Tide Dock is a half tide dock on the River Mersey, England, and part of the Port of Liverpool. It is situated in the northern dock system in Kirkdale, connected to Huskisson Dock to the north, Wellington Dock to the east and Bramley-Moore Dock Bramley-Moore Dock is a semi- reclaimed dock on the River Mersey in Liverpool, England, and part of the Port of Liverpool. The dock is located in the northern dock system in Liverpool's Vauxhall area, and is connected to Sandon Half Tide Doc ... to the south. Sandon Dock was situated to the north of Wellington Dock and was accessible via Sandon Half Tide Dock. History Opened in 1851, the site was originally part of both Sandon Dock and Wellington Half Tide Dock, which connected directly to the Mersey via a narrow lock entrance. At the turn of the 20th century, Sandon Dock was redeveloped and an enlarged half tide dock created, with two larger locks built either side of the original entrance. After these access ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gladstone Dock
Gladstone Dock is a dock on the River Mersey, England, and part of the Port of Liverpool. It is situated in the northern dock system in Bootle. The dock is connected to Seaforth Dock to the north and what remains of Hornby Dock to the south. Part of Liverpool Freeport, Gladstone Dock is operated by the Mersey Docks and Harbour Company. History The dock is named after Robert Gladstone, a merchant from Liverpool and second cousin of Prime Minister William Ewart Gladstone. Designed in the first decade of the twentieth century, construction was eventually completed in 1927 and consisted of of quays and extensive warehouse space. The graving dock was completed in 1913, before the rest of the dock became operational. At long and wide it was designed to take the largest trans-Atlantic steamers. The graving dock has since been converted into a wet dock (Gladstone Number Three Branch Dock). Gladstone Dock lock entrance is one of the two remaining operational river entrances in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Quay
A wharf, quay (, also ), staith, or staithe is a structure on the shore of a harbour or on the bank of a river or canal where ships may dock to load and unload cargo or passengers. Such a structure includes one or more berths ( mooring locations), and may also include piers, warehouses, or other facilities necessary for handling the ships. Wharves are often considered to be a series of docks at which boats are stationed. Overview A wharf commonly comprises a fixed platform, often on pilings. Commercial ports may have warehouses that serve as interim storage: where it is sufficient a single wharf with a single berth constructed along the land adjacent to the water is normally used; where there is a need for more capacity multiple wharves, or perhaps a single large wharf with multiple berths, will instead be constructed, sometimes projecting over the water. A pier, raised over the water rather than within it, is commonly used for cases where the weight or volume of cargos will ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
