Session B.pdf - Clarkson University

17th International Symposium on Ice
Saint Petersburg, Russia, 21 - 25 June 2004
International Association of Hydraulic Engineering and Research
THE COMPUTER MODEL OF FORMATION OF AN ICE
JAM AT THE LENA RIVER
Belikov V.V. 1 , Zaitsev A.A. 2
ABSTRACT
The computer hydraulic model of formation of an ice jam levels on the rivers is
considered in the reporting. The model is based on construction of a digital model of a
relief with application of GIS-technologies and numerical solution of the equations of
the Saint-Venant in a one-dimensional and two-dimensional schematization. The
accounts of a disastrous jam of 2001 in region of city Lensk in Ykut region are
conducted. The good concurrence to full-scale dates was obtained. A main outcome that
by primary factors, defining an ice jam levels, are length of a jam and water discharge.
Height of an ice dam in the basis of a jam is not the main reason of rise of a level of
water. It allows to evaluate recurrence of a jam levels.
The jams of ice originating during rough ice moving on the large rivers, call of
splashing down of territory and result in disastrous consequences. Per the last years are
marked is anomalous high jam flood on the Vuychegda and the Lena rivers. The
disastrous floods from jams of ice put enormous damage to economy. The huge losses
were suffered by economy and population of Yakutia republic after a series of highpower
vernal floods in region of cities Lensk, Olekminsk and Yakutsk. As have shown
conducted researches existing of techniques of the prognosis of a jam floods are
incomplete, owing to many factors of the phenomenon.
The problem was delivered to supply a guard of the occupied items from of a jam floods
and other unfavorable effects caused by the rivers. For construction of levies and
acceptance of other measures on prevention or minimization of consequences of floods
it is required to have an operating information about probable levels and flooded areas
of territory. The executed researches put by the purpose to supply account of levels of a
jam flood and area of its distribution for a high water of 2001 to use the developed
technique for the operating forecast for consequent years.
The research of the problem consists of development of the numerical method of the
prognosis of floods caused by ice jams. It was selected the fragment of the Lena river in
1 Scientific Research Institute of Energy Structures, Moscow
2 Moscow State University of Environmental Engineering
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