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The Northern river reversal or Siberian river reversal was an ambitious project to divert the flow of the Northern rivers in the Soviet Union, which "uselessly" drain into the Arctic Ocean, southwards towards the populated agricultural areas of Central Asia, which lack water.〔(Saving the Caspian )〕〔(Making Rivers Run Backward )〕 Research and planning work on the project started in the 1930s, and was carried out on a large scale in the 1960s through the early 1980s. The controversial project was abandoned in 1986, primarily for environmental reasons, without much actual construction work ever done. ==Development of the river rerouting projects== The project to turn Siberian rivers goes back to the 1830s when tsarist surveyor Alexander Shrenk proposed it〔"Making Rivers Run Backward", Time U.S., Frederic Golden; By Frederic Golden, reported by: Erik Amfitheatr, Monday, June 14, 1982; web-edition: http://www.time.com/time/magazine/article/0,9171,950711-2,00.html〕 when the big canal engineering projects were conceived (i.e. the Suez and Panama canals). The project of turning some of the flow of the northern rivers to the south was discussed, on a smaller scale, in the 1930s. In November 1933, a special conference of the USSR Academy of Sciences approved a plan for a "reconstruction of the Volga and ", which included the diversion into the Volga of some of the waters of the Pechora and the Northern Dvina - two rivers in the north of European Russia that flow into the seas of the Arctic Ocean. Research in that direction was then conducted by the Hydroproject, the dam and canal institute led by Sergey Yakovlevich Zhuk ((ロシア語:Сергей Яковлевич Жук)). Some design plans were developed by Zhuk's institute, but without much publicity or actual construction work.〔Douglas R. Weiner, "A Little Corner of Freedom: Russian Nature Protection from Stalin to Gorbachev". University of California Press, 1999. ISBN 0-520-23213-5. (On Google Books ) p. 415〕 In January 1961, several years after Zhuk's death, Nikita Khrushchev presented a memo by Zhuk and another engineer, G. Russo, about the river rerouting plan to the Central Committee of the CPSU.〔 Despite the ousting of Khrushchev in 1964, talks about the projects of turning the major rivers Pechora, Tobol, Ishim, Irtysh, and Ob resumed in the late 1960s.〔Michael Overman, "Water". Doubleday, 1969, no ISBN. (On Google Books ) ("Rerouting of Rivers", p. 183 and on)〕 Some 120 institutes and agencies participated in the impact study coordinated by the Academy of Sciences; a dozen conferences were held on the matter. The promoters of the project claimed that extra food production due to the availability of Siberian water for irrigation in Central Asia could provide food for some 200,000,000 people.〔 The plans involved not only irrigation but also the replenishing of the shrinking Aral Sea and Caspian Sea. In the 1970s construction started to divert the Pechora River through Kama River toward the Volga and the Caspian Sea in the south-west of Russia. In 1971, at a meeting of the International Atomic Energy Agency in Vienna, the Soviets disclosed information about earthworks on the route of the Pechora-Kama Canal using detonations of three 15-kiloton nuclear devices spaced 500 feet apart, claiming negligible radioactive fallout.〔 However, no further construction work, nuclear or otherwise, was conducted on that canal. It was estimated that 250 more nuclear detonations would have been required to complete the levelling for the channel if the procedure had been continued. Pollution on the surface was found to be manageable. In the US, expert opinion was divided with some endorsing this project; the physicist Glenn Werth, of the University of California's Lawrence Livermore Laboratory, stated that it was "both safe and economical".〔"(Saving the Caspian )", ''Time'' U.S., Monday, March 17, 1975〕 Others feared climatic cooling from reduced river water flow, while others thought that increased salinity would melt ice and cause warming. Further work on this irrigation canal was soon stopped. In the 1980s at least 12 of the Arctic Ocean-bound rivers were proposed to be redirected to the south. At that time it was estimated that an additional freeze-up would occur to cut the brief northern growing season by two weeks if 37.8 billion extra cubic meters of water were returned annually to the European side of Russia and 60 billion cubic meters in Siberia. The adverse effect of climatic cooling was greatly feared and contributed much to the opposition at that time, and the scheme was not taken up. Severe problems were feared from the thick ice expected to remain well past winter in the proposed reservoirs. By delaying the spring thaw, it was feared, the prolonged freeze-up could cut the already brief northern growing season by two weeks. It was also feared that the prolonged winter weather would cause an increase in spring winds and reduce vital rains. More disturbing, some scientists cautioned that if the Arctic Ocean was not replenished by fresh water, it would get saltier and its freezing point would drop, the icecap would begin to melt, possibly starting a global warming trend. Other scientists feared that the opposite might occur: as the flow of warmer fresh water would be reduced, the polar ice might expand. A British climatologist, Michael Kelly, warned of the consequences: changes in polar winds and currents might reduce rainfall in the regions benefiting from the river redirection.〔Golden, Fredrick, "(Making Rivers Run Backward )", ''Time'' U.S., June 14, 1982〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Northern river reversal」の詳細全文を読む スポンサード リンク
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