Petrov lake Danger of a large-scale ecological disaster - LIPortal
Petrov lake Danger of a large-scale ecological disaster - LIPortal
Petrov lake Danger of a large-scale ecological disaster - LIPortal
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Regular Meeting Sunrise TownshipThursday, January 20, 2011Royal Wilcox Community CenterJoel Peterson called the Sunrise Township regular Board Meeting to order at 7:00 p.m.Pledge <strong>of</strong> Allegiance was recited.Board Members Present:Joel PetersonStephen MertenGerald BjorkJeske NoordergraafManley OlsonOthers Present:Treasurer: Karen AndersonClerk: Wendy S. KowalkeLynn Wolleat, Lead MaintenanceCommissioner Rick GreenePaul Steward – Thatcher EngineeringLoren JohnsonRobert BoycePaul PalmerBob Linder, Almelund FireApprove Agenda: Motion by Stephen Merten, second by Gerald Bjork to accept the January 2011agenda. Motion carried.Meeting Minutes: Motion by Gerald Bjork, second by Stephen Merten to accept the December 2010minutes. Motion carried.Clerk Update: NoneTreasurer Report: Motion by Gerald Bjork, second by Manley Olson to accept the treasurer’s reportwith claims list #3155 through 3166 for approval with additional claims as follows:Cheri Cunningham (website)......................................................................................................... $15.00Cars R Us Plus (repair on one-ton)........................................................................................... $1,381.06Kimball Midwest (lubricant and poly straps) .............................................................................. $278.27Olson Power & Equipment............................................................................................................ $74.46H&L Mesabi (cutting edges for wing)...................................................................................... $1,764.48MN DNR Eco-waters (water usage pumped at Johnson Pit) ...................................................... $140.00Motion by Stephen Merten, second by Gerald Bjork to accept the treasurer’s report with the transferamount as indicated below. Motion carried.Transfer from saving to checking:$18,000January 2011 TB mm Page 1 <strong>of</strong> 3
This paper is supported bydevelopment project <strong>of</strong> the CzechGovernment „Monitoring <strong>of</strong> highmountain glacier <strong>lake</strong>s andprotection <strong>of</strong> population againstcatastrophic impacts <strong>of</strong> floodscaused by rupture <strong>of</strong> morainedams“.
<strong>Petrov</strong> <strong>lake</strong>
<strong>Petrov</strong> <strong>lake</strong> :an extremely dangerous situation•Is located in the foreground <strong>of</strong> the same-calledglacier on the north-western slope <strong>of</strong> Ak-Sijrakmassive in southern Tien-Shan.• <strong>Petrov</strong> glacier is 69.8 km² <strong>large</strong> and 23 kmlong.• Morainic-glacier <strong>lake</strong>: developed in basin <strong>of</strong>intramorainic depression after retreat <strong>of</strong> <strong>Petrov</strong>glacier.
Topography <strong>of</strong> theAk –Sijrak massive<strong>Petrov</strong> glacier<strong>Petrov</strong> <strong>lake</strong>
Pohled přes odkaliště dolu Kumtor směrem k ledovci a jezeruledovec <strong>Petrov</strong>a
Odkaliště ložiska Kumtor
<strong>Petrov</strong> <strong>lake</strong>:an extremelydangerous situation
<strong>Petrov</strong> <strong>lake</strong>:an extremelydangerous situation
Glacier retreat(1957-2004)19571980 2004
Glacier retreat (1957-2006)
Terminus fluctuations <strong>of</strong> <strong>Petrov</strong> glacier1869-19571957-19801980-19901990-19991999-2006Total retreat(m)1330570380390430Annual retreat(m/y)15.124.838.043.361.4
Bathymetric map
Morphometric characteristics <strong>of</strong> <strong>Petrov</strong> Lake(results <strong>of</strong> fieldwork in 2006)Area (km 2 )Perimeter (km)Maximum lenght (km)3.8011.952.65Maximum width (km)Maximum depth (m)Volume (mil. m 3 )2.0269.5060.30
Meteorological station Tjan - Shan1930-20056010505precipitation (mm)4030200-5-10-15temperature (°C)srážkyteplota10-200I II III IV V VI VII VIII IX X XI XII-257060Meteorological station Tjan - Shan2001-2005105precipitation (mm)504030200-5-10temperature (°C)srážkyteplota10-150I II III IV V VI VII VIII IX X XI XII-20
Meteorological station Tjan - Shan (3665 m a.s.l.)1930-20055000450-1400-2p recip itatio n (m m )350300250200150-3-4-5-6-7tem p eratu re (°C )SrážkyTeplota100-850-90-101930193519401945195019551960196519701975198019851990199520002005
3735Vývoj průměrných denních teplot vzduchu a kolísáníhladiny jezera během roku 2005103734,550v o d n í st a v (m n . m .)37343733,53733-5-10-15-20teplo ta (°C )3732,5Vodní stavTeplota-2537321.I 23.I 14.II 8.III 30.III 21.IV 13.V 4.VI 26.VI 18.VII 9.VIII 31.VIII 22.IX 14.X 5.XI 27.XI 19.XII-30
superficial outflownarow part <strong>of</strong> the dam
Geomorphology
Moraine -glacier dam:the <strong>lake</strong>s <strong>of</strong> thermokarsticdepressions
37603745lowest point <strong>of</strong> thedam11.9 m abovewater surfaceLake <strong>Petrov</strong>a - transversal pr<strong>of</strong>ilewater surfacem a. s.3730moraine - glacierdamBlue bay3715maximum depth21 mLevel <strong>of</strong> the Naryn river3700-200 -170 -140 -110 -80 -50 -20 10 40 70 100 130 160 190 220 250 280 310 340 370 400 430 460m
Increase <strong>of</strong> the <strong>lake</strong> area• In 1911: 0.2 -0.3 km²• In 1947: 0.8 km² an annual growht: 15 000 –18 000 m²• In 1957: 0.96 km² an annual growth: 11 000 m²• In 1980: 1.83 km² an annual growth: 37 600 m²• In 1995: 2.78 km² an annual growth: 63 000 m²• In 2006: 3.80 km² an annual growth: 102 273 m²• The present volume can to be <strong>of</strong> the order<strong>of</strong> 60,3 millions m³
GeophysicsProject Kyrgyzstan 2005Geophysical Investigation <strong>of</strong> Damsby VES and SRP MethodFig 2: Location: Kumtor Lake DamPr<strong>of</strong>ile P1, P2, KCross-section <strong>of</strong> apparent resistivityby VES and SRP methodDate <strong>of</strong> measurement: 2005 07. 16.10 Celsius degree, snowextent <strong>of</strong> ice ???extent <strong>of</strong> iceSCALE: 1 : 2000 / 1 : 100080604020Pr<strong>of</strong>ile P2850 900 950 1000 1050 1100170000160000150000140000130000120000110000100000900008000070000600005000040000300002000015000100007500500025000apparent resistivity (ohmm)37603740372037003680???Pr<strong>of</strong>ile KPr<strong>of</strong>ile P1100366050 100 150 20080no datano data6040800 850 900 950 1000 1050 1100 1150 1200
The Kumtor gold minetailings pipelineandtailings dam
Conclusion• The thermokarstic processes caused by melting <strong>of</strong>the buried ice in the moraine dam <strong>of</strong> the <strong>Petrov</strong> <strong>lake</strong>undergo vigorous a very dynamic development.• The surface area and volume <strong>of</strong> the retained waterin the <strong>Petrov</strong> <strong>lake</strong> increase considerably.• The retreat <strong>of</strong> the <strong>Petrov</strong> glacier has continuallyaccelerated since 1957.
Conclusion• Enlarging <strong>of</strong> the <strong>lake</strong> size and volume togetherwith weakening <strong>of</strong> moraine stability causes anextremely dangerous situation which couldresult in a <strong>large</strong>-<strong>scale</strong> natural catastrophe.•In the case <strong>of</strong> the dam rupture the storagefacility <strong>of</strong> highly toxic waste on the territory <strong>of</strong>the gold mine Kumtor could be washed out.•In such case the toxic waste would contaminatea <strong>large</strong> area in the Naryn river valley includingtwo big water reservoirs and could get into theterritory <strong>of</strong> adjacent Uzbekistan.
The scientists havea hard live…
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