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BAIKAL (known to the Mongols as Dalai...

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Originally appearing in Volume V03, Page 216 of the 1911 Encyclopedia Britannica.
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BAIKAL (known to the See also:Mongols as Dalai-nor, and to the See also:Turkish tribes as Bai-kul)  , a See also:lake of See also:East See also:Siberia, the See also:sixth in See also:size of all the lakes of the See also:world and the largest fresh-See also:water See also:basin of Eurasia . It stretches from S.W. to N.E . (51° 29' to 550 50' N. See also:lat. and 103° 40' to 11o° E. See also:long.), separating the See also:government of See also:Irkutsk from that of See also:Transbaikalia, and has a length of 386 m. and a width of from 20 M. to 50 M . Its See also:southern extremity penetrates into the high See also:plateau of See also:Asia, and the lake lies entirely in the Alpine See also:zone which fringes that plateau on the See also:north-See also:west . Its See also:area is 13,200 sq . M., i.e. nearly as See also:great as See also:Switzerland . The length of its See also:coast-See also:line is 525 M. along the western, and 64o m. along the eastern See also:shore . Its See also:altitude has been estimated at 1587 ft . (Chersky) and at 1679 ft . (See also:Suess)—118 ft. above the level of the Angara at Irkutsk (Zapiski Russ . Geog . See also:Soc. xv., 1885); but 1500 ft. would seem to be a more correct altitude (Izvestia East Sib .

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Branch, See also:xxviii . 1, 1897), Its level is subject to slight oscillations, and after a heavy five See also:weeks' See also:rain in 1869 it See also:rose 7 ft., an immense territory at the mouth of the Selenga being submerged . A hydrographic survey of this lake was made by Drizhenko in 1897–1902 . The elongated hilly See also:island of Olkhon, and the See also:peninsula of Svyatoi Nos, which forms its continuation on the opposite eastern shore, See also:divide the lake into two basins . The deepest See also:part is in the See also:south-east, at the See also:foot of the Khamardaban border-See also:ridge of the high plateau . An elongated trough, 66 m. long, reaches there a See also:depth of over 600 fathoms, with a maximum depth of 88o fathoms, i.e. about 5280 ft. below the level of the ocean . As a See also:rule the bottom of the lake has very steep slopes : the Too-See also:fathom and even the 250-fathom lines run See also:close to the shores, that is to say, the steepness of the surrounding mountains (4600 to 6000 ft.) continues beneath the See also:surface . At the mouth of the Selenga, however, which enters from the south-east, pouring into it the See also:waters and the alluvial deposits from a drainage area of 173,500 sq . M., a wide See also:delta is thrust out into the lake, reducing its width to 20 M. and spreading under its waters, so as to leave only a narrow channel, 230 to 247 fathoms deep, along the opposite coast . The depth of the See also:middle portion of the lake has not yet been measured, but must exceed 500 fathoms . It was expected that an under-ground ridge would be found connecting Olkhon with Svyatoi Nos; but depths exceeding 622 fathoms have been sounded even along that line . As to the See also:northern basin, the configuration of its bottom is in accordance with the high mountains which ' See L .

Pinvert, Lazare de Baif, 1496 ?–1547 (1900) . 215 surround it, and most of its area has a depth exceeding 400 fathoms, the maximum depths along three lines of soundings taken across it being 491, 485, and 476 fathoms respectively . The water is beautifully clear . Temperature.—The surface-layers of this immense basin are heated in the summer up to temperatures of 551° to 570 F., both close to the shores and at some distance from the mouth of the Selenga ; but these warmer layers are not deep, and a See also:

uniform temperature of nearly 39° F. is generally found at a depth of 20 fathoms, as also on the surface in the middle of the lake . At a depth of 500 fathoms there is a nearly uniform temperature of 38° . At various places See also:round the shores, e.g. the mouth of the Barguzin, hot springs exist . The lake freezes usually at the end of See also:December, or in the beginning of See also:January, so solidly that a temporary See also:post-See also:horse station is erected on the See also:ice in the middle of the lake, and it remains frozen till the second See also:half of May . The evaporation from this large basin exercises a certain See also:influence on the See also:climate of the surrounding See also:country, while the absorption of See also:heat for the thawing of the ice has a notable cooling effect in See also:early summer . See also:Rivers.—Lake See also:Baikal receives over 300 streams, mostly See also:short See also:mountain torrents, besides the Upper Angara, which enters its north-east extremity, the Barguzin, on the east, and the Selenga on the south-east . Its only outflow is the See also:lower Angara, which issues through a rocky cleft on the west shore . The Irkut no longer reaches the Baikal, though it once did so . After approaching its south-west extremity it abandons the broad valley which leads to the lake, and makes its way northwards through a narrow See also:gap in the mountains and joins the Angara at Irkutsk .

Mountains.—With the exception of the delta of the Selenga, Lake Baikal is surrounded by lofty mountains . The Khamardaban border-ridge (the See also:

summit of a mountain of the same name is 5300 ft. above the lake), falling with steep cliffs towards the lake, fringes it on the south; a massive, deeply-ravined highland occupies the space between the Irkut and the Angara; the Onot and Baikal ridges (also Primorskiy) run along its north-west shore, striking it diagonally; an Alpine complex of yet unexplored mountains rises on its north-east shore; the Barguzin range impinges upon it obliquely in the east; and the Ulanburgasu mountains intrude into the delta of the Selenga . See also:Geology.—It is certain that in previous See also:geological ages Lake Baikal had a much greater See also:extension . It stretched westwards into the valley of the Irkut, and up the lower valleys of the Upper Angara and the Barguzin . Volcanic activity took See also:place around its shores at the end of the See also:Tertiary or during the See also:Quaternary See also:Age, and great streams of See also:lava See also:cover the Sayan and Khamar-daban mountains, as well as the valley of Irkut . See also:Earth-quakes are still frequent along its shores . See also:Fauna.—The fauna, explored by Dybowski and Godlewski, and in 'goo–2 by Korotnev, is much richer than it was supposed to be, and has quite an See also:original See also:character; but hypotheses as to a See also:direct communication having existed between Lake Baikal and the See also:Arctic Ocean during the Pest-Tertiary or Tertiary ages are not proved . Still, Lake Baikal has a See also:seal (Phoca vitulina, Phoca haikalensis of Dybowski) quite akin to the See also:seals of See also:Spitsbergen, marine See also:sponges, polychaetes, a marine mollusc (ancilodoris), and some marine gammarids . The waters of the lake swarm with See also:fish (sturgeons and salrnonidae), and its See also:herring (See also:Salina omul) is the See also:chief product of the See also:fisheries, though notably fewer have been taken within the last See also:forty or fifty years . Planktonis very abundant . The little Lake Frolikha, situated close to the northern extremity of Lake Baikal and communicating with it by means of a See also:river of the same name, contains a See also:peculiar See also:species of See also:trout, Salmo erythreas, which is not known elsewhere . Generally, while there is a relative poverty of zoological See also:groups, there is a great See also:wealth of species within the See also:group .

Of gammarids, there are as many as 300 species, and those living at great depths (330 to 380 fathoms) tend to assume abyssal characters similar to those displayed by the deep-See also:

sea fauna of the ocean . See also:Navigation.—Navigation of the lake is rendered difficult both by sudden storms and by the See also:absence of See also:good bays and ports . The See also:principal See also:port on the western shore, Listvinichnoe, near the outflow of the Angara, is an open roadstead at the foot of steep mountains . Steamers ply from it weekly to Misovaya (Posolskoe) on the opposite shore, a few times a See also:year to Verkhne-Angarsk, at the northern extremity of the lake, and frequently to the mouth of the Selenga . Steamers ascend this river as far as Bilyutai, near the Mongolian frontier, and bring back See also:tea, imported via See also:Kiakhta, while See also:grain, See also:cedar nuts, See also:salt, soda, See also:wool and See also:timber are shipped on rafts down the Khilok, Chikoi and Uda (tributaries of the Selenga), and manufactured goods are taken up the river for export to See also:China . Attempts are being made to render the Angara navigable below Irkutsk down to the See also:Yenisei . In See also:winter, when the lake is covered with ice 3 ft. to 4 ft. thick, it is crossed on sledges from Listvinichnoe to Misovaya . But a See also:highway, available all the year round, was made in 1863-1864 around its southern shore, partly by See also:blasting the cliffs, and it is now (since 1905) followed by the trans-Siberian railway . Further, a powerful ice-breaker is used to See also:ferry trains across from Listvinichnoe to -Misovaya .

End of Article: BAIKAL (known to the Mongols as Dalai-nor, and to the Turkish tribes as Bai-kul)
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BAIDAWI ('Abdallah ibn 'Umar al-BaidawI)
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WILLIAM BALFOUR BAIKIE (1824-1864)

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