A1260834314dOVPu

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AARI/NPI Fram Arctic climate studies laboratory
(FAL)
"Reconstruction of an annual drain values rivers
of Grønfjord basin, West Spitsbergen with
method rivers analogues use"
The project NPI-supervisor j. kohler, The
project AARI-supervisor M.V. Tretyakov, Grantee
I.Yu. Solovyanova
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Project purpose is the reconstruction of annual
runoff values of river basins of Grønfjord (West
Spitsbergen) with use of rivers analogues
method.
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Available data Daily runoff Bayelva River
(1989-2003) De Geer River (1991-2003) Fragmenta
ry daily runoff Aldegonda River
(2002-2004) Grøn River (2003-2004)
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• T H E O R Y
• Runoff reconstruction was made
• according empirical formulas
• ? (?s 9.5)3 (1)
• ? (?s 8.7)3 (2)
• ?(?s 7,9)3 (3)
• ? ((?s 9.5)2/2) (4)
• ? 17 3,87? (5)
• using rivers-analogues
• To find out the correct river-analogue, for our
  research objects
• To calculate within year distribution in
  rivers-analogues
• To find out the best relation between runoff in
  river-analogue and research river

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R E S U L T S
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Rivers-analogues method
Grøn River y 1,225x 0,72 (r 0,91), 2003
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Rivers-analogues method
Aldegonda River ? 1,52x 0,36 (r 0,86),
2002 ? 0,39x 0,59 (r 0,88), 2002/03
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Calculated volumes of winter runoff and values of
mean daily water discharge by using naleds in
researched basins
Naleds dimensions, m Naleds dimensions, m Naleds volume, ?3 W, m3 Q, m3/day Q, m3/s Comments
according aerial photographs according aerial photographs according aerial photographs according aerial photographs according aerial photographs according aerial photographs according aerial photographs
150 75 7875 5906 24,6 0,00028 Tunge gl, 1938
400 150 42000 31500 131,3 0,00152 Aldegonda gl, 1956
267 100 18667 14000 58,3 0,00068 Aldegonda gl, 1956
50 25 875 656 2,70 0,00003 Baalsrud gl, 1969
100 21980 16485 68,7 0,00079 Tunge gl, 1990
100 150 10500 7875 32,8 0,00038 Tunge gl, 1990
100 150 10500 7875 32,8 0,00038 Tunge gl, 1990
according field observations according field observations according field observations according field observations according field observations according field observations according field observations
100 70 4900 3675 15,3 0,00018 Aldegonda gl, 2003
120 15 1260 945 3,9 0,00005 Aldegonda gl, 2003
200 70 9800 7350 30,6 0,00035 Aldegonda gl, 2004
300 150 31500 23625 98,4 0,00114 Aldegonda gl, 2004
- mean naled thickness taken as 0,7 m -
cold period is equal 240 days - naled
radius.
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Runoff ways
to Congress Lake basin
to Linne Lake basin
Aldegonda River basin
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Aldegonda Glacier
Area - 7 km2 Length - 3 km Width - 2-2.5
km Tongue height 75 m a.s.l. Average height 300
m a.s.l. Ablation rate 2000 mm per year
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Idealized longitudinal cross section of a glacier
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1900 m
1500 m
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moulin ? 2
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moulin ? 2
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moulin ? 3
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• Main results
• the exit of subglacial and englacial waters only
  one and it is on the left side of the glacier
  front.
• the mean travel time from the glacier front to
  the mouth of the river was determine 29 min.
• the mean travel time of the meltwaters through
  the glacier 158 min.
• the velocity of the englacial meltwaters
  approximately 6 times less then the velocity of
  supraglacial meltwaters and is equal to 0,2 m/s.
  
• high values of water conductivity tells about
  some under glacier water storage.

date Salt weight, kg Strait distance, km of moulin Travel time, min velocity, m/s
16.07.05 10 2,02 3Aw 29 1,149
19.07.05 25 1,49 3? 114 0,218
21.07.05 25 1,99 2? 129 0,257
11.08.05 15 1,99 2? 269 0,123
15.08.05 15 1,49 3? 118 0,210
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Conclusions

• The reconstruction of river runoff was made but
  we need more measured data to obtain best results
  of reconstruction
• By the results of the dye-tracing experiments
  were obtained some data of the englacial and
  subglacial Aldegonda glacier drainage systems
• The radioechosounding gives sometimes not the
  true situation inside the glaciers

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Future tasks

• To find out is there any water piracy
• How internal drainage system of the glaciers can
  influence into the river runoff?
• How big difference between river runoff from
  cold-based and politermal glaciers?

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Thank you!