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Black Swan (dredge)
The ''Black Swan'' was the first bucket dredge used by the Swan River Colony (now Western Australia) to make its rivers more suitable for shipping. The dredge was operational from 1872 to 1911, when it was scuttled. Initially known as the Government Dredge, it was renamed after being repaired and modified between 1887 and 1888. The dredging carried out by the ''Black Swan'' and other vessels had a significant impact on the river fauna and flora, including the black swans for which it was named. Design and construction The need for dredging the Canning and Swan Rivers, particularly around Perth Water, had been identified as early as 1865. The shallow waters limited opportunities for trade, forcing cargo to be loaded and unloaded at the end of the Swan River, near Fremantle. In 1869 the government ordered a dredge from England, which arrived in segments at Fremantle in 1869 and was assembled in . The dredge was long, with a beam of , and a 12-horsepower steam engine, that could ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dredging
Dredging is the excavation of material from a water environment. Possible reasons for dredging include improving existing water features; reshaping land and water features to alter drainage, navigability, and commercial use; constructing dams, dikes, and other controls for streams and shorelines; and recovering valuable mineral deposits or marine life having commercial value. In all but a few situations the excavation is undertaken by a specialist floating plant, known as a dredger. Dredging is carried out in many different locations and for many different purposes, but the main objectives are usually to recover material of value or use, or to create a greater depth of water. Dredges have been classified as suction or mechanical. Dredging has significant environmental impacts: it can disturb marine sediments, leading to both short- and long-term water pollution, destroy important seabed ecosystems, and can release human-sourced toxins captured in the sediment. Description ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jarrah
''Eucalyptus marginata'', commonly known as jarrah, djarraly in Noongar language and historically as Swan River mahogany, is a plant in the myrtle family, Myrtaceae and is endemic to the south-west of Western Australia. It is a tree with rough, fibrous bark, leaves with a distinct midvein, white flowers and relatively large, more or less spherical fruit. Its hard, dense timber is insect resistant although the tree is susceptible to dieback. The timber has been utilised for cabinet-making, flooring and railway sleepers. Description Jarrah is a tree which sometimes grows to a height of up to with a diameter at breast height (DBH) of , but more usually with a DBH of up to . Less commonly it can be a small mallee to 3 m. Older specimens have a lignotuber and roots that extend down as far as . It is a stringybark with rough, greyish-brown, vertically grooved, fibrous bark which sheds in long flat strips. The leaves are arranged alternately along the branches, narrow lance- ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Perth Zoo
Perth Zoo is a zoological park in South Perth, Western Australia. The zoo first opened in 1898 and by 2011 housed 1258 animals of 164 species and an extensive botanical collection. It is a full institutional member of the Zoo and Aquarium Association (ZAA) and the World Association of Zoos and Aquariums (WAZA). History The Perth Zoological Gardens were opened on 17 October 1898 by the Governor of Western Australia, Lieutenant-Colonel Sir Gerard Smith. Planning for the zoo had started in 1896 when the Acclimatisation Society first met, the original purpose of which was to introduce European animals to Australia and establish a zoo for conservation purposes. In 1897 this group invited the director of the Melbourne Zoo, Albert Le Souef, to choose a site. His son Ernest was chosen as the first director of the Perth Zoo, and work began in 1897. The first exhibits built included two bear caves, a monkey house, a mammal house and a model castle for guinea pigs. The first animals ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Canning River
The Canning River (Djarlgarra in Nyungar) is a major tributary of the Swan River in the South West Land Division of Western Australia. It is home to much wildlife including dolphins, pelicans, swans and many other bird species. Source and route With headwaters on the Darling Scarp, the Canning meanders through suburbs of Perth, Western Australia on the Swan Coastal Plain, including Cannington, Thornlie, Riverton, Shelley, Rossmoyne and Mount Pleasant, before joining the Swan at Melville Water just downstream of the Canning Bridge. Bridges * Canning Bridge * Mount Henry Bridge * Shelley Bridge * Riverton Bridge * Kent Street Weir Bridge * Greenfield Street Bridge * Canning River Downstream Bridge * Canning River Upstream Bridge * Djarlgarra Bridge Easthbound * Djarlgarra Bridge Westbound * unnamed railway bridge * Royal Street Bridge * unnamed pedestrian bridge * Burslem Bridge * unnamed railway bridge * Jenna Biddi Footbridge * unnamed railway bridge * unnamed pedestr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Land Reclamation
Land reclamation, usually known as reclamation, and also known as land fill (not to be confused with a waste landfill), is the process of creating new land from oceans, seas, riverbeds or lake beds. The land reclaimed is known as reclamation ground or land fill. In some jurisdictions, including parts of the United States, the term "reclamation" can refer to returning disturbed lands to an improved state. In Alberta, Canada, for example, reclamation is defined by the provincial government as "The process of reconverting disturbed land to its former or other productive uses." In Oceania, it is frequently referred to as land rehabilitation. History One of the earliest large-scale projects was the Beemster Polder in the Netherlands, realized in 1612 adding of land. In Hong Kong the Praya Reclamation Scheme added of land in 1890 during the second phase of construction. It was one of the most ambitious projects ever taken during the Colonial Hong Kong era.Bard, Solomon. 002 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Barrack Street
Barrack Street is one of two major cross-streets in the Perth central business district, central business district of Perth, Western Australia. Together with St Georges Terrace, Wellington Street, Perth, Wellington Street and William Street, Perth, William Street it defines the boundary of the main shopping precinct of the central city. Route description Barrack Street commences at Barrack Street Jetty, and the adjacent Barrack Square. Moving in an uphill direction away from the Swan River (Western Australia), Swan River, it passes alongside the Supreme Court Gardens, Perth, Supreme Court Gardens and the Stirling Gardens. Crossing St Georges Terrace, Barrack Street then passes alongside the heritage-listed Treasury Buildings, Perth, Treasury Buildings and the Perth Town Hall. The town hall location was regularly utilised for special occasions, including the Royal visits to Australia#Early 20th century (1901–1950), royal visit in 1901, and the centenary of Western Australia ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
William Street, Perth
William Street is a suburban distributor and one of two major cross-streets in the central business district of Perth, Western Australia. Commencing in western Mount Lawley, its route takes it through the Northbridge café and nightclub district as well as the CBD. Route description William Street's northern end is at Walcott Street in . It travels southwest along one block, for , before turning southwards. After it reaches Vincent Street, and the southern edge of Mount Lawley. The road continues in a south-south-westerly direction, at the eastern edge of Hyde Park and the western edge of . One block beyond the park, within the suburb of , William Street intersects Bulwer Street, which connects to three parallel arterial roads – Lord Street Beaufort Street, and Fitzgerald Street – as well as the major north–south road, Charles Street. William Street realigns itself one block further east through a reverse curve. At this point, it intersects Brisbane Street, which b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
The Narrows, Western Australia
The Narrows Bridge is a freeway and railway crossing of the Swan River in Perth, Western Australia. Made up of two road bridges and a railway bridge constructed at a part of the river known as ''the Narrows'', located between Mill Point and Point Lewis, it connects the Mitchell and Kwinana Freeways, linking the city's northern and southern suburbs. The original road bridge was opened in 1959 and was the largest precast prestressed concrete bridge in the world. Construction of the northern interchange for this bridge necessitated the reclamation of a large amount of land from the river. The bridge formed part of the Kwinana Freeway which originally ran for only to Canning Bridge. Over the following decades, the freeway system was expanded to the north and south, greatly increasing the volume of traffic using the bridge. As a result, in 2001, a second road bridge was opened to the west of the original bridge, and in 2005, the railway bridge was constructed in the gap between ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Flywheel
A flywheel is a mechanical device which uses the conservation of angular momentum to store rotational energy; a form of kinetic energy proportional to the product of its moment of inertia and the square of its rotational speed. In particular, assuming the flywheel's moment of inertia is constant (i.e., a flywheel with fixed mass and second moment of area revolving about some fixed axis) then the stored (rotational) energy is directly associated with the square of its rotational speed. Since a flywheel serves to store mechanical energy for later use, it is natural to consider it as a kinetic energy analogue of an electrical inductor. Once suitably abstracted, this shared principle of energy storage is described in the generalized concept of an accumulator. As with other types of accumulators, a flywheel inherently smooths sufficiently small deviations in the power output of a system, thereby effectively playing the role of a low-pass filter with respect to the mechanical velocity ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Swan River Colony
The Swan River Colony, also known as the Swan River Settlement, or just Swan River, was a British colony established in 1829 on the Swan River, in Western Australia. This initial settlement place on the Swan River was soon named Perth, and it became the capital city of Western Australia. The name was a ''pars pro toto'' for Western Australia. On 6 February 1832 the colony was renamed the Colony of Western Australia, when the colony's founding lieutenant-governor, Captain James Stirling, belatedly received his commission. However, the name "Swan River Colony" remained in informal use for many years afterwards. European exploration The first recorded Europeans to sight land where the city of Perth is now located were Dutch sailors. Most likely the first visitor to the Swan River area was Frederick de Houtman on 19 July 1619, travelling on the ships and . His records indicate he first reached the Western Australian coast at latitude 32°20', which is approximately at Warnbro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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