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Jetty
A jetty is a man-made structure that protrudes from land out into water. A jetty may serve as a breakwater (structure), breakwater, as a walkway, or both; or, in pairs, as a means of constricting a channel. The term derives from the French language, French word ', "thrown", signifying something thrown out. For regulating rivers Wing dams Jetties of one form, wing dams, are extended out, opposite one another, from each bank of a river, at intervals, to contract a wide channel (geography), channel, and concentrate the current to deepen the channel. At the outlet of tideless rivers Jetties have been constructed on each side of the outlet river of some of the rivers flowing into the Baltic Sea, Baltic, with the objective of prolonging the scour of the river and protecting the channel from being shoaled by the littoral drift along the shore. Another application of parallel jetties is in lowering the bar in front of one of the mouths of a deltaic river flowing into a tide — a v ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Breakwater (structure)
A breakwater is a permanent structure constructed at a coastal area to protect against tides, currents, waves, and storm surges. Breakwaters have been built since antiquity to protect anchorage (maritime), anchorages, helping isolate vessels from marine hazards such as wind-driven waves. A breakwater, also known in some contexts as a jetty or a Mole_(architecture), mole, may be connected to land or freestanding, and may contain a walkway or road for vehicle access. Part of a coastal management system, breakwaters are installed parallel to the shore to minimize erosion. On beaches where longshore drift threatens the erosion of beach material, smaller structures on the beach may be installed, usually perpendicular to the water's edge. Their action on waves and current is intended to slow the longshore drift and discourage mobilisation of beach material. In this usage they are more usually referred to as groynes. Purposes Breakwaters reduce the intensity of wave action in ins ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dock (maritime)
The word dock () in American English refers 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). In British English, the term is not used the same way as in American English; it is used to mean the area of water that is next to or around a wharf or quay. 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#Wadi al-Jarf, 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 (water), current to avoid deposition of silt. Modern oceanographers have observed that the ancient Indu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sulina Branch
The Sulina branch is a distributary of the river Danube that contributes to forming the Danube Delta. The other two main branches of the Danube are the Chilia branch to the north and the Sfântu Gheorghe branch to the south. The Sulina branch starts at a bifurcation of the Tulcea distributary, at Sfântu Gheorghe, Tulcea, runs east for , and reaches the Black Sea at the port of Sulina. Its outflow comprises about 20% of the Danube's discharge. Early history Until 1857, the Sulina Branch was in its initial state. Its path was long, and sinuous, its width varying between and , and the depth of its thalweg was between and below the local water level. The Crimean War The Crimean War was fought between the Russian Empire and an alliance of the Ottoman Empire, the Second French Empire, the United Kingdom of Great Britain and Ireland, and the Kingdom of Sardinia (1720–1861), Kingdom of Sardinia-Piedmont fro ... guaranteed its importance. From about 1850 to 1900, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Shoreham-by-Sea
Shoreham-by-Sea (often shortened to Shoreham) is a coastal town and port in the Adur District, Adur district, in the county of West Sussex, England. In 2011 it had a population of 20,547. The town is bordered to its north by the South Downs, to its west by the Adur Valley, and to its south by the River Adur and Shoreham Beach on the English Channel. The town lies in the middle of the ribbon of urban development along the English south coast, approximately equidistant from the city of Brighton and Hove to the east and the town of Worthing to the west. Shoreham covers an area of and has a population of 20,547 (2011 census). History Old Shoreham dates back to pre-Roman times. St Nicolas' Church, Shoreham-by-Sea, St Nicolas' Church, inland by the River Adur, is partly Anglo-Saxon in its construction. The name of the town has an Old English origin. The town and port of New Shoreham was established by the Norman Conquest, Norman conquerors towards the end of the 11th century. St ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tide
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. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sand
Sand is a granular material composed of finely divided mineral particles. Sand has various compositions but is usually defined by its grain size. Sand grains are smaller than gravel and coarser than silt. Sand can also refer to a textural class of soil or soil type; i.e., a soil containing more than 85 percent sand-sized particles by mass. The composition of sand varies, depending on the local rock sources and conditions, but the most common constituent of sand in inland continental settings and non-tropical coastal settings is silica (silicon dioxide, or SiO2), usually in the form of quartz. Calcium carbonate is the second most common type of sand. One such example of this is aragonite, which has been created over the past 500million years by various forms of life, such as coral and shellfish. It is the primary form of sand apparent in areas where reefs have dominated the ecosystem for millions of years, as in the Caribbean. Somewhat more rarely, sand may be composed ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Humboldt Bay And Eureka Aerial View
Humboldt may refer to: People * Alexander von Humboldt, German natural scientist, brother of Wilhelm von Humboldt * Wilhelm von Humboldt, German linguist, philosopher, and diplomat, brother of Alexander von Humboldt Fictional characters * Humboldt Fleisher, character in novel ''Humboldt's Gift'' * Wes Humboldt, character played by Mike O'Brien on '' Corner Gas'' Places Argentina * Humboldt, Argentina, a town in Santa Fe Province, Argentina Australia * Humboldt, Queensland, a locality in the Central Highlands Region Canada * Humboldt, Saskatchewan * Rural Municipality of Humboldt No. 370, Saskatchewan * Humboldt (federal electoral district), a former federal electoral district * Humboldt (provincial electoral district), a former Saskatchewan provincial electoral district United States * Settled places: ** Dewey-Humboldt, Arizona ** Humboldt, Illinois ** Humboldt, Iowa ** Humboldt, Kansas ** Humboldt, Minnesota ** Humboldt, Nebraska ** Humboldt, Ohio ** Hum ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Marseille
Marseille (; ; see #Name, below) is a city in southern France, the Prefectures in France, prefecture of the Departments of France, department of Bouches-du-Rhône and of the Provence-Alpes-Côte d'Azur Regions of France, region. Situated in the Provence region, it is located on the coast of the Mediterranean Sea, near the mouth of the Rhône river. Marseille is the List of communes in France with over 20,000 inhabitants, second-most populous city proper in France, after Paris, with 873,076 inhabitants in 2021. Marseille with its suburbs and exurbs create the Aix-Marseille-Provence Metropolis, with a population of 1,911,311 at the 2021 census. Founded by Greek settlers from Phocaea, Marseille is the oldest city in France, as well as one of Europe's List of oldest continuously inhabited cities, oldest continuously inhabited settlements. It was known to the ancient Greeks as ''Massalia'' and to ancient Romans, Romans as ''Massilia''. Marseille has been a trading port since ancient ... [...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 chamber in a permanently fixed position in which the water level can be varied. (In a caisson lock, a boat lift, or on a canal inclined plane, it is the chamber itself (usually then called a caisson (engineering), 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. Over time, more and larger locks have been used in canals to allow a more direct route to be taken. History Ancient Egypt In Ancient Egypt, the river-locks was probably part of the Canal of the Pharaohs: Ptolemy II is credited by some for being the first to solve the problem of keeping the Nile free of salt water when his engineers invented the lock around 274/273 BC. Ancient China During 960–1279 CE, the natural extension o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Openwork
In art history, architecture, and related fields, openwork or open-work is any decorative technique that creates holes, piercings, or gaps through a solid material such as metal, wood, stone, pottery, cloth, leather, or ivory. Such techniques have been very widely used in a great number of cultures. The term is rather flexible, and used both for additive techniques that build up the design, as for example most large features in architecture, and those that take a plain material and make cuts or holes in it. Equally techniques such as casting using Molding (process), moulds create the whole design in a single stage, and are common in openwork. Though much openwork relies for its effect on the viewer seeing right through the object, some pieces place a different material behind the openwork as a background. Varieties Techniques or styles that normally use openwork include all the family of lace and cutwork types in textiles, including broderie anglaise and many others. Fretwork in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fascine Mattress
A fascine mattress , literally sink piece), is a large woven mat made of wikt:brushwood, brushwood, typically willow twigs and shoot (botany), shoots, used to protect riverbeds and other underwater surfaces from Hydrodynamic scour, scour and erosion. They are similar in construction to a fascine, but are primarily used for hydraulic engineering works, typically to strengthen the banks of rivers and streams, as well as coastal structures like revetments and groynes. Modern fascine mattresses utilise a layer of geotextile in order to fulfill the competing requirements of water Permeability (Earth sciences), permeability balanced with the need to be impervious to sand. Prior to the advent of synthetic geotextiles in the 1960s, a layer formed from Reed (plant), reeds was incorporated to make the fascine mattress sand-tight. Fascine mattresses have been used worldwide, but are particularly common in The Netherlands, where significant expertise in their preparation and construction i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
