"reconstruction of an annual drain values rivers of grønfjord basin, west spitsbergen
DESCRIPTION
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, - PowerPoint PPT PresentationTRANSCRIPT
"Reconstruction of an annual drain values rivers "Reconstruction of an annual drain values rivers of Grønfjord basin, West Spitsbergen of Grønfjord basin, West Spitsbergen
with method ‹‹rivers – analogues›› use"with method ‹‹rivers – analogues›› use"
"Reconstruction of an annual drain values rivers "Reconstruction of an annual drain values rivers of Grønfjord basin, West Spitsbergen of Grønfjord basin, West Spitsbergen
with method ‹‹rivers – analogues›› use"with method ‹‹rivers – analogues›› use"
The project NPI-supervisor : j. kohler,The project AARI-supervisor : M.V. Tretyakov,Grantee: I.Yu. Solovyanova
AARI/NPI “Fram” Arctic climate studies laboratory (FAL)
Project purpose is the reconstruction of annual runoff values of river basins of Grønfjord (West Spitsbergen) with use of rivers – analogues method.
Available data
Daily runoff:
Bayelva River (1989-2003)
De Geer River (1991-2003)
Fragmentary daily runoff:
Aldegonda River (2002-2004)
Grøn River (2003-2004)
0
1
2
3
4
5
6
7
8
9
10
4.7
9.7
14.7
19.7
24.7
29.7 3.8
8.8
13.8
18.8
23.8
28.8 2.9
7.9
12.9
Q,m3/s
2002 2003 2004
T H E O R YT H E O R Y
Runoff reconstruction was made:
according empirical formulas:
А = (Тs + 9.5)3 (1)А = (Тs + 8.7)3 (2)А=(Тs + 7,9)3 (3)А =((Тs + 9.5)2/2) (4)А = 17 + 3,87Т (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
R E S U L T SR E S U L T SAldegonda
0,00
2,00
4,00
6,00
8,00
10,00
12,00
14,00
16,00
18,00
20,00
01.0
6.19
89
08.0
6.19
89
15.0
6.19
89
22.0
6.19
89
29.0
6.19
89
06.0
7.19
89
13.0
7.19
89
20.0
7.19
89
27.0
7.19
89
03.0
8.19
89
10.0
8.19
89
17.0
8.19
89
24.0
8.19
89
31.0
8.19
89
0,00
2,00
4,00
6,00
8,00
10,00
12,00
14,00
16,00
18,00
20,00
P, мм Q rec, m3/s Т, C
Gron
0,00
5,00
10,00
15,00
20,00
25,00
30,00
35,00
40,00
01.0
6.19
89
08.0
6.19
89
15.0
6.19
89
22.0
6.19
89
29.0
6.19
89
06.0
7.19
89
13.0
7.19
89
20.0
7.19
89
27.0
7.19
89
03.0
8.19
89
10.0
8.19
89
17.0
8.19
89
24.0
8.19
89
31.0
8.19
89
0,00
2,00
4,00
6,00
8,00
10,00
12,00
14,00
16,00
18,00
20,00
P, mm Q rec, m3/s Т, C
Gren River
0
10
20
30
40
50
60
70
80
1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003
W m
ln. m
3
by the river-annalogues method
according Krenke's formula (dayly reconstraction) T
according Krenke's formula (dayly reconstraction) Т5
Gren River, 1998
0
5
10
15
20
25
30
29.4 24.5 18.6 13.7 7.8 1.9 26.9 21.10 15.11
date
Qre
c, m
3 /s
Grøn River
y = 1,225x + 0,72 (r = 0,91), 2003
RiversRivers--analogues method:analogues method:
Aldegonda River
у = 1,52x – 0,36 (r = 0,86), 2002
у = 0,39x + 0,59 (r = 0,88), 2002/03
2002/03
y = 0,3941x + 0,5905R2 = 0,7693
0,00
1,00
2,00
3,00
4,00
5,00
0,00 1,00 2,00 3,00 4,00 5,00 6,00 7,00 8,00 9,00 10,00bay
alde
gond
a
RiversRivers--analogues method:analogues method:
0
1
2
3
4
5
6
7
8
9
10
14.5 3.6 23.6 13.7 2.8 22.8 11.9 1.10 21.10
date
Qre
c, m
3/s
1 2 3
1 – reconstructed by a method of rivers-analogs; 2 – observed values;
3 – reconstructed by empirical formula (5)
0
1
2
3
4
5
6
7
8
9
10
14.5 3.6 23.6 13.7 2.8 22.8 11.9 1.10 21.10
date
Qre
c, m
3/s
1 2 3
1 – reconstructed by a method of rivers-analogs; 2 – observed values;
3 – reconstructed by empirical formula (5)
Calculated volumes of winter runoff and values of mean daily water discharge by using naleds in researched basins
Naleds dimensions,
mNaleds
volume, м3
W, m3 Q, m3/day Q, m3/s Comments
according aerial photographs
150 75 7875 5906 24,6 0,00028 Tunge gl, 1938
400 150 42000 31500 131,3 0,00152Aldegonda gl, 1956
267 100 18667 14000 58,3 0,00068Aldegonda 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
100 70 4900 3675 15,3 0,00018Aldegonda gl, 2003
120 15 1260 945 3,9 0,00005Aldegonda gl, 2003
200 70 9800 7350 30,6 0,00035Aldegonda gl, 2004
300 150 31500 23625 98,4 0,00114Aldegonda gl, 2004
* - mean naled thickness taken as 0,7 m; ** - cold period is equal 240 days; *** - naled radius.
Aldegonda River basin
to Congress Lake basin
to Linne Lake basin
Runoff ways
Aldegonda Glacier
Area - 7 km2
Length - 3 kmWidth - 2-2.5 km
Tongue height 75 m a.s.l.Average height ~ 300 m a.s.l.
Ablation rate ~ 2000 mm per year
1937
2004
Idealized longitudinal cross section of a glacier
A
C1
C2
0
50
100
150
1Aw2Aw3Aw4Aw5Aw co
nd
uc
tiv
ity
, mS
m/s
m
17.07.2005 01.08.2005
1500 m
1900 m
moulin № 2
Aldegonda River (11.08.05)
0,02
0,025
0,03
0,035
8:30 10:30 12:30 14:30time
mg/
l
20:30 2:3022:30 0:30
Aldegonda River (21.07.05)
0,015
0,02
0,025
0,03
0,035
0,04
16:00 16:30 17:00 17:30 18:00 18:30time
NaC
l, м
г/л
2acave
0
0,2
0,4
0,6
0,8
1
1,2
1,4
Q, m
3/s
21.07.2005 11.08.2005
moulin № 2
Aldegonda River, (190705)
0,039
0,040
0,041
0,042
0,043
0,044
0,045
16:00 16:30 17:00 17:30 18:00 18:30 19:00 19:30time
NaC
l, м
г/л
moulin № 3
Aldegonda150805
0,02
0,025
0,03
0,035
0,04
15:47 16:47 17:47 18:47 19:47 20:47
time
Na
Cl,
mg
/l
Main results:• the exit of subglacial and englacial waters only one and it is on the left the exit of subglacial and englacial waters only one and it is on the left side of the glacier front.side of the glacier front.
• the mean travelthe mean travel time from the glacier front to the mouth of the river was time from the glacier front to the mouth of the river was determine –determine – 29 min29 min. .
• the mean travelthe mean travel time of the meltwaters through the glacier –time of the meltwaters through the glacier – 158 158 min min. .
• the velocity of the englacial meltwaters approximately 6 times less then the velocity of the englacial meltwaters approximately 6 times less then the velocity of supraglacial meltwaters and is equal the velocity of supraglacial meltwaters and is equal to 0to 0,2 ,2 mm//ss. .
•high values of water conductivity tells about some under glacier water high values of water conductivity tells about some under glacier water storage. storage.
dateSalt
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 3а 1140,218
21.07.05
25 1,99 2а 1290,257
11.08.05
15 1,99 2а 2690,123
15.08.05
15 1,49 3а 1180,210
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
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?
