18 Svetlana Agafanova

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River ice within the Arctic zone of Western Siberia S.A. Agafonova Lomonosov Moscow State University, Moscow, Russia 2 STUDY AREA [xudognik.umi.ru] [national-atlas.ru] 3 STUDY AREA Major rivers are the Ob, Nadym, Pur and Taz (the Kara Sea basin). 40 hydrological stations the period from 1936 to 2014 Information on terms of ice phenomena (appearance of ice, freeze-up, breakup, beginning of the spring ice run and ice clearance); on their duration (ice phenomena period, ice cover, autumn sludge run and spring ice run); typical water levels during spring ice run and ice jams formation and the frequency of ice jams; Ice thickness. 4 RIVER ICE Ob Ob Ob Nadym Pyakupur Pur Taz Gulf of Taz Gorki Salekhard Jar-Sale Nadym Tarko-Sale Urengoy Sidorovsk Nakhodka T1 211 225 239 232 231 237 240 258 T2 198 209 228 219 220 224 229 248 T1 – ice phenomena, days; T 2 – ice cover, days. 5 THE DURATION OF ICE PERIODS Ob Ob Ob Nadym Pyakupur Pur Taz Gulf of Taz Gorki Salekhard Jar-Sale Nadym Tarko-Sale Urengoy Sidorovsk Nakhodka T1 211 225 239 232 231 237 240 258 T2 198 209 228 219 220 224 229 248 T1 – ice phenomena, days; T 2 – ice cover, days. 6 TERMS OF APPEARANCE OF ICE AND FREEZE-UP Nadym Pyakupur Pur Taz Gulf of Taz (1936-2014) Nadym Tarko-Sale Urengoy Sidorovsk Nakhodka appearance of ice 9 Okt 12 Okt 10 Okt 11 Okt 3 Okt freeze-up 18 Okt 21 Okt 20 Okt 19 Okt 14 Okt 7 ICE COVER GROWTH Ob Ob Ob Nadym Pyakupur Pur Taz Gulf of Taz Gorki Salekhard Salemal Nadym Tarko-Sale Urengoy Sidorovsk Nakhodka h1 33 37 42 34 35 34 38 50 h2 89 104 133 93 87 91 100 122 Average ice thickness: h 1 – the end of November, sm; h 2 – the end of April, sm. 8 ICE THICKNESS 9 TERMS OF BREAKUP AND ICE CLEARANCE Nadym Pyakupur Pur Taz Gulf of Taz (1936-2014) Nadym Tarko-Sale Urengoy Sidorovsk Nakhodka break-up 25 May 28 May 31 May 3 Jun 13 Jun ice clearance 29 May 30 May 3 Jun 6 Jun 18 Jun 10 ICE-RUN WATER LEVEL AND ICE-RELATED FLOODS .

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Yamalia English Language Teachers’ Association
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