Водопад Виктория: Величие Замбези

Waterfall on the Zambezi River in Zambia and Zimbabwe

Victoria Falls (Lozi: Mosi oa Tunya, "Thundering Smoke"; Tonga: Shungu Namutitima, "Boiling Water") is a waterfall on the Zambezi River in southern Africa, which provides habitat for several unique species of plants and animals. It is located on the border between Zambia and Zimbabwe and is one of the world's largest waterfalls, with a width of
Archeological sites and oral history describe a long record of African knowledge of the site. Though known to some European geographers before the 19th century, Scottish missionary David Livingstone identified the falls in 1855, naming them Victoria Falls after Queen Victoria. Since the mid 20th century, the site has been an increasingly important source of tourism. Zambia and Zimbabwe both have national parks and tourism infrastructure at the site. Research in the late 2010s found that precipitation variability due to climate change is likely to change the character of the fall.

David Livingstone, the Scottish missionary and explorer, is the first European recorded to have viewed the falls on 16 November 1855, from what is now known as Livingstone Island, one of two land masses in the middle of the river, immediately upstream from the falls near the Zambian shore. Livingstone named his sighting in honour of Queen Victoria, but the Sotho language name, Mosi oa Tunya—"The Smoke That Thunders"—continues in common usage. The World Heritage List officially recognises both names. Livingstone also cited an older name, Seongo or Chongwe, which means "The Place of the Rainbow", as a result of the constant spray. The nearby national park in Zambia is named Mosi oa Tunya, whereas the national park and town on the Zimbabwean shore are both named Victoria Falls.

While it is neither the highest nor the widest waterfall in the world, the Victoria Falls is classified as the largest, based on its combined width of and height of , resulting in the world's largest sheet of falling water. The Victoria Falls are roughly twice the height of North America's Niagara Falls and well over twice its width. For a considerable distance upstream from the falls, the Zambezi flows over a level sheet of basalt, in a shallow valley, bounded by low and distant sandstone hills. The river's course is dotted with numerous tree covered islands, which increase in number where the river approaches the falls. There are no mountains, escarpments, or deep valleys; only a flat plateau extending hundreds of kilometres in all directions. The falls are formed where the full width of the river plummets in a single vertical drop into a transverse chasm wide, carved by its waters along a fracture zone in the basalt plateau. The depth of the chasm, called the First Gorge, varies from at its western end to in the centre. The only outlet from the First Gorge is a gap about two thirds of the way across the width of the falls from the western end. The whole volume of the river pours into the Victoria Falls gorges from this narrow cleft. There are two islands on the crest of the falls that are large enough to divide the curtain of water even at full flood: Boaruka Island (or Cataract Island) near the western bank, and Livingstone Island near the middle – the point from which Livingstone first viewed the falls. At less than full flood, additional islets divide the curtain of water into separate parallel streams. The main streams are named, in order from Zimbabwe (west) to Zambia (east): the Devil's Cataract The spray from the falls typically rises to a height of over , and sometimes even twice as high, and is visible from up to away. At full moon, a "moonbow" can be seen in the spray instead of the usual daylight rainbow. During the flood season, however, it is impossible to see the foot of the falls and most of its face, and the walks along the cliff opposite it are in a constant shower and shrouded in mist. Close to the edge of the cliff, spray shoots upward like inverted rain, especially at Zambia's Knife Edge Bridge. When the dry season takes effect, the islets on the crest become wider and more numerous, and in September to January up to half of the rocky face of the falls may become dry and the bottom of the First Gorge can be seen along most of its length. At this time it becomes possible (though not necessarily safe) to walk across some stretches of the river at the crest. It is also possible to walk to the bottom of the First Gorge at the Zimbabwean side. The minimum flow, which occurs in November, is around a tenth of the April figure; this variation in flow is greater than that of other major falls, and causes the Victoria Falls' annual average flow rate to be lower than might be expected based on the maximum flow.

In November 1855, David Livingstone was the first European who saw the falls, when he travelled from the upper Zambezi to the mouth of the river between 1852 and 1856. The falls were well known to local tribes, and Voortrekker hunters may have known of them, as may the Arabs under a name equivalent to "the end of the world". Europeans were sceptical of their reports, perhaps thinking that the lack of mountains and valleys on the plateau made a large falls unlikely. Livingstone had been told about the falls before he reached them from upriver and was paddled across to a small island that now bears the name Livingstone Island in Zambia. Livingstone had previously been impressed by the Ngonye Falls further upstream, but found the new falls much more impressive, and gave them their English name in honour of Queen Victoria. He wrote of the falls, "No one can imagine the beauty of the view from anything witnessed in England. It had never been seen before by European eyes; but scenes so lovely must have been gazed upon by angels in their flight." and British artist Thomas Baines, who executed some of the earliest paintings of the falls. Until the area was opened up by the building of the railway in 1905, though, the falls were seldom visited by other Europeans. Some writers believe that the Portuguese priest Gonçalo da Silveira was the first European to catch sight of the falls back in the sixteenth century.

[[File:Victoria Falls gorge1. jpg|thumb|Victoria Falls' Second Gorge (with bridge) and Third Gorge (right). The peninsular cliffs are in Zambia, the outer cliffs in Zimbabwe. The cliffs are composed of Batoka Formation basalt flows. The breaks in slope with vegetation are brecciated amygdaloidal basalt zones separating six successive and massive lava flows with distinct vertical jointing.

Riverine forest with palm trees lines the banks and islands above the falls. The most notable aspect of the area's vegetation though is the rainforest nurtured by the spray from the falls, containing plants rare for the area such as pod mahogany, ebony, ivory palm, wild date palm, batoko plum and creepers and lianas. Rising temperatures make the region hotter and drier. This is particularly pronounced in drought years, which are becoming more frequent and intense. Such occurrences have affected the aesthetics of the waterfalls, and there are fears that Victoria Falls might join other World Heritage sites categorised as last chance destinations. While it has already had a negative impact on tourism, many experts in the region dismiss the story as ill researched and irresponsible journalism. They do not deny climate change and the impact it is having on the amount of water that cascades over the falls, but they argue the narrative is incomplete.

262px 221px"The Smoke that Thunders", rainy season, 1972 and dry season, September 2003 Size and flow rate of Victoria Falls with Niagara and Iguazu for comparison Parameters Victoria Falls Niagara Falls Iguazu Falls Height in meters and feet:108 m360 ft51 m167 ft64–82 m210–269 ft Width in meters and feet: 1,708 m 5,604 ft1,203 m3,947 ft2,700 m8,858 ft Flow rate units (vol/s): m3/s cu ft/s m3/s cu ft/s m3/s cu ft/s Mean annual flow rate: 1,088 38,4302,40785,0001,74661,600 Mean monthly flow – max. : 3,000 105,944 Mean monthly flow – min. : 300 10,594 Mean monthly flow – 10 yr. max. : 6,000 211,888 Highest recorded flow: 12,800 452,0006,800 240,000 45,700 1,614,000 Notes: See references for explanation of measurements. For water, cubic metres per second = tonnes per second. Half the water approaching Niagara is diverted for hydroelectric power. Iguazu has two drops; height given for biggest drop and total height.10 falls have greater or equal flow rates, but are not as high as Iguazu and Victoria Falls.