A harbor ( American English ), or harbour ( Australian English , British English , Canadian English , Irish English , New Zealand English ; see spelling differences ), is a sheltered body of water where ships , boats , and barges can be moored . The term harbor is often used interchangeably with port , which is a man-made facility built for loading and unloading vessels and dropping off and picking up passengers. Harbors usually include one or more ports. Alexandria Port in Egypt, meanwhile, is an example of a port with two harbors.
34-598: Bay of Baku ( Baku Bay ) is a natural harbor of the Baku port and local yacht club , on the southern shore of the Absheron Peninsula and on the western shore of the Caspian Sea . It has an area of 50 km² and a coastline of 20 km. The bay is bordered by Sultan Cape in the east, Shikh Cape on the south-west and the islands of Qum , Dash Zira and Boyuk Zira in the south and south-east. These islands are part of
68-434: A jetty or a 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
102-399: A body of water is protected and deep enough to allow anchorage. Many such harbors are rias . Natural harbors have long been of great strategic naval and economic importance, and many great cities of the world are located on them. Having a protected harbor reduces or eliminates the need for breakwaters as it will result in calmer waves inside the harbor. Some examples are: For harbors near
136-415: A function of the distance the breakwaters are built from the coast, the direction at which the wave hits the breakwater, and the angle at which the breakwater is built (relative to the coast). Of these three, the angle at which the breakwater is built is most important in the engineered formation of salients. The angle at which the breakwater is built determines the new direction of the waves (after they've hit
170-511: A recreational center in Boyuk Zira and Pirallahi islands of Baku bay. In Azerbaijani newspapers is reported that a Turkish company which is preparing an appropriate project will hold the construction of the recreational center in Nargin Island . It is planned to open modern hotels, entertainment places and other buildings on the island. It is also planned to open one of the biggest lunaparks in
204-569: A representative of the Ministry of Ecology and Natural Resources there are a lot of reasons of pollution of Baku bay. Wastes from industrial, dwelling and domestic objects located on the seashore and also exploitation of vessels, oil and gas deposits are the main factors that worsen the ecological condition. Works on investigation of depth of Baku bay began after 1996, and later works on extraction of metallic constructions and sunk vessels from water were begun. In 2007-2009's, large scale works on cleansing of
238-442: A significant saving over revetment breakwaters. An additional rubble mound is sometimes placed in front of the vertical structure in order to absorb wave energy and thus reduce wave reflection and horizontal wave pressure on the vertical wall. Such a design provides additional protection on the sea side and a quay wall on the inner side of the breakwater, but it can enhance wave overtopping . A similar but more sophisticated concept
272-643: Is Long Beach Harbor , California , United States, which was an array of salt marshes and tidal flats too shallow for modern merchant ships before it was first dredged in the early 20th century. In contrast, a natural harbor is surrounded on several sides by land. Examples of natural harbors include Sydney Harbour , New South Wales, Australia, Halifax Harbour in Halifax, Nova Scotia , Canada and Trincomalee Harbour in Sri Lanka. Artificial harbors are frequently built for use as ports. The oldest artificial harbor known
306-577: Is a port for ferry quay in the north-western part of Baku bay. There is discussion on the need of construction of a bridge through Baku bay, - from Lokbatan to Zikh highway. It is considered that length of the bridge over the sea, from Shikh to Zig is 14,5 km. Total length of the bridge, which will be connected with encircling highway is 26 km. The sea bridge will be constructed on high piers, for not impeding movement of vessels. Automobile highway through Baku bay will be paid. Construction works will last for 3,5 years. Foreign companies plan to open
340-651: Is a wave-absorbing caisson, including various types of perforation in the front wall. Such structures have been used successfully in the offshore oil-industry, but also on coastal projects requiring rather low-crested structures (e.g. on an urban promenade where the sea view is an important aspect, as seen in Beirut and Monaco ). In the latter, a project is presently ongoing at the Anse du Portier including 18 wave-absorbing 27 m (89 ft) high caissons. Wave attenuators consist of concrete elements placed horizontally one foot under
374-518: Is designed to absorb the energy of the waves that hit it, either by using mass (e.g. with caissons), or by using a revetment slope (e.g. with rock or concrete armour units). In coastal engineering , a revetment is a land-backed structure whilst a breakwater is a sea-backed structure (i.e. water on both sides). Rubble mound breakwaters use structural voids to dissipate the wave energy. Rubble mound breakwaters consist of piles of stones more or less sorted according to their unit weight: smaller stones for
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#1732845508986408-465: Is intended to slow the longshore drift and discourage mobilisation of beach material. In this usage they are more usually referred to as groynes . Breakwaters reduce the intensity of wave action in inshore waters and thereby provide safe harbourage. Breakwaters may also be small structures designed to protect a gently sloping beach to reduce coastal erosion ; they are placed 100–300 feet (30–90 m) offshore in relatively shallow water. An anchorage
442-430: Is limited in practice by the natural fracture properties of locally available rock. Shaped concrete armour units (such as Dolos , Xbloc , Tetrapod , etc.) can be provided in up to approximately 40 tonnes (e.g. Jorf Lasfar , Morocco), before they become vulnerable to damage under self weight, wave impact and thermal cracking of the complex shapes during casting/curing. Where the very largest armour units are required for
476-809: Is only safe if ships anchored there are protected from the force of powerful waves by some large structure which they can shelter behind. Natural harbours are formed by such barriers as headlands or reefs . Artificial harbours can be created with the help of breakwaters. Mobile harbours, such as the D-Day Mulberry harbours , were floated into position and acted as breakwaters. Some natural harbours, such as those in Plymouth Sound , Portland Harbour , and Cherbourg , have been enhanced or extended by breakwaters made of rock. Types of breakwaters include vertical wall breakwater, mound breakwater and mound with superstructure or composite breakwater. A breakwater structure
510-561: Is the Ancient Egyptian site at Wadi al-Jarf , on the Red Sea coast, which is at least 4500 years old (ca. 2600–2550 BCE, reign of King Khufu ). The largest artificially created harbor is Jebel Ali in Dubai . Other large and busy artificial harbors include: The Ancient Carthaginians constructed fortified, artificial harbors called cothons . A natural harbor is a landform where a section of
544-467: The Baku Archipelago which lies mostly within the bay. These characteristics make it an ideal place for a harbor. There lies Baku Boulevard on the seashore. During severe storms with high winds, the height of the waves in the bay can reach 1–5 m. From the 1st century AD till the 7th century, Baku bay was dry and the islands in the bay joined the land. In Ptolemy ’s map, Baku was described far from
578-477: The CIS , which will be constructed by German specialists. It is expected that the island will be one of the centers of tourism in the future. Harbor Harbors may be natural or artificial. An artificial harbor can have deliberately constructed breakwaters , sea walls , or jetties or they can be constructed by dredging , which requires maintenance by further periodic dredging. An example of an artificial harbor
612-460: The North and South poles , being ice-free is an important advantage, especially when it is year-round. Examples of these are: The world's southernmost harbor, located at Antarctica 's Winter Quarters Bay (77° 50′ South), is sometimes ice-free, depending on the summertime pack ice conditions. Although the world's busiest port is a contested title, in 2017 the world's busiest harbor by cargo tonnage
646-466: The Newport breakwater. The dissipation of energy and relative calm water created in the lee of the breakwaters often encourage accretion of sediment (as per the design of the breakwater scheme). However, this can lead to excessive salient build up, resulting in tombolo formation, which reduces longshore drift shoreward of the breakwaters. This trapping of sediment can cause adverse effects down-drift of
680-520: The United States Army Corps of Engineers Coastal engineering manual (available for free online) and elsewhere. For detailed design the use of scaled physical hydraulic models remains the most reliable method for predicting real-life behavior of these complex structures. Breakwaters are subject to damage and overtopping in severe storms. Some may also have the effect of creating unique types of waves that attract surfers, such as The Wedge at
714-409: The bay of sunken vessels, metallic constructions and non-exploited hydrotechnical constructions, non-serviceable subsea pipelines began. In all 4500 tons of scrap metal and approximately 412 tons of wooden waste were extracted from the sea. Trade port is stretched along the northern and western shores of Baku bay. The port is fully re-equipped, all loading and unloading works in it are mechanized. There
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#1732845508986748-641: The breakwaters), and in turn the direction that sediment will flow and accumulate over time. The reduced heterogeneity in sea floor landscape introduced by breakwaters can lead to reduced species abundance and diversity in the surrounding ecosystems. As a result of the reduced heterogeneity and decreased depths that breakwaters produce due to sediment build up, the UV exposure and temperature in surrounding waters increase, which may disrupt surrounding ecosystems. There are two main types of offshore breakwater (also called detached breakwater): single and multiple. Single, as
782-403: The breakwaters, leading to beach sediment starvation and increased coastal erosion . This may then lead to further engineering protection being needed down-drift of the breakwater development. Sediment accumulation in the areas surrounding breakwaters can cause flat areas with reduced depths, which changes the topographic landscape of the seabed. Salient formations as a result of breakwaters are
816-461: The collided wave energy and prevent the generation of standing waves. As design wave heights get larger, rubble mound breakwaters require larger armour units to resist the wave forces. These armour units can be formed of concrete or natural rock. The largest standard grading for rock armour units given in CIRIA 683 "The Rock Manual" is 10–15 tonnes. Larger gradings may be available, but the ultimate size
850-461: The core and larger stones as an armour layer protecting the core from wave attack. Rock or concrete armour units on the outside of the structure absorb most of the energy, while gravels or sands prevent the wave energy's continuing through the breakwater core. The slopes of the revetment are typically between 1:1 and 1:2, depending upon the materials used. In shallow water, revetment breakwaters are usually relatively inexpensive. As water depth increases,
884-525: The effect of the incident wave, creates waves in phase opposition to the incident wave downstream from the slabs. A submerged flexible mound breakwater can be employed for wave control in shallow water as an advanced alternative to the conventional rigid submerged designs. Further to the fact that, the construction cost of the submerged flexible mound breakwaters is less than that of the conventional submerged breakwaters, ships and marine organisms can pass them, if being deep enough. These marine structures reduce
918-406: The free surface, positioned along a line parallel to the coast. Wave attenuators have four slabs facing the sea, one vertical slab, and two slabs facing the land; each slab is separated from the next by a space of 200 millimetres (7.9 in). The row of four sea-facing and two land-facing slabs reflects offshore wave by the action of the volume of water located under it which, made to oscillate under
952-450: The material requirements—and hence costs—increase significantly. Caisson breakwaters typically have vertical sides and are usually erected where it is desirable to berth one or more vessels on the inner face of the breakwater. They use the mass of the caisson and the fill within it to resist the overturning forces applied by waves hitting them. They are relatively expensive to construct in shallow water, but in deeper sites they can offer
986-623: The most exposed locations in very deep water, armour units are most often formed of concrete cubes, which have been used up to ~ 195 tonnes Archived 2019-05-12 at the Wayback Machine for the tip of the breakwater at Punta Langosteira near La Coruña, Spain. Preliminary design of armour unit size is often undertaken using the Hudson's equation , Van der Meer and more recently Van Gent et al.; these methods are all described in CIRIA 683 "The Rock Manual" and
1020-414: The name suggests, means the breakwater consists of one unbroken barrier, while multiple breakwaters (in numbers anywhere from two to twenty) are positioned with gaps in between (160–980 feet or 50–300 metres). The length of the gap is largely governed by the interacting wavelengths. Breakwaters may be either fixed or floating, and impermeable or permeable to allow sediment transfer shoreward of the structures,
1054-511: The sea was waving near the foot of the Maiden Tower , which confirms a legend about a girl, who threw herself from the top of the tower. At that time Sabayil Castle , which was built on the rock in Baku bay, was totally located underwater. During the next 600 years, the level of the sea was hesitatingly stood high till the beginning of the 20th century when it began to sink. According to a statement of
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1088-565: The sea. After the 7th century, the water level of the Caspian Sea rose until the 9th century and since then, the formation of Baku bay began. Severe changes happened at the end of the 8th century, when the Caspian Sea rose more than ten meters. A major earthquake occurred in 1306, the Sabayil Castle , built on an island in the Bay of Baku, was submerged and remained underwater for several centuries. It
1122-409: Was only in the early 18th century, when the Caspian Sea retreated, that the island resurfaced. Mario Sanuto, an Italian geographer of the 14th century sadly noted that: "Water level of the Caspian Sea rises each year and most cities have flooded.", and according to words of Abd ar-Rashid al-Bakuvi, the geographer, in 1403 the Caspian Sea flooded the part of Baku and water stood near a mosque. At that time
1156-477: Was the Port of Ningbo-Zhoushan . The following are large natural harbors: 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 anchorages , helping isolate vessels from marine hazards such as wind-driven waves. A breakwater, also known in some contexts as
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