joint project spree matter transformation in the spreewald wetland region
TRANSCRIPT
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Joint project Spree
Matter transformation in the Spreewald wetland region
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Study siteStudy site
channel network with high density
high groundwater table, 30% fens
water consumptive area in summer time
groundwater-table control (13 cascades)
different flooding regimes during winter and summer seasons with partly flooding
low flow velocities in channels
vm = 0,01 m/s for MQ in the Upper Spreewald
vm = 0,1 m/s for MQ in the Lower Spreewald
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Water quality processesWater quality processes
Q, c input (e.g. Spree, Malxe)
t, v Hydraulic structures
c
c
pore water concentrations
water column
± Q, c
c
?
area water exchange, loads
matter concentrations of sediment
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Conceptual modelConceptual model
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Reduction o
f the n
etwork 4630000 4632500 4635000 4637500 4640000 4642500 4645000 4647500
5745000
5747500
5750000
5752500
5755000
Modelled structureModelled structure
Scheme
Complex model DUFLOW
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Data acquisition, monitoring networks
Hydrology, Hydraulics Water quality
Discharges (1991-2000, monthly mean)
Surface water quality (1991-2000, monthly, appointed date)
Channel network, profiles Ground water quality (near to surface)
Water levels at weirs (1991-2000, monthly mean)
Rate data (reaction kinetics)
Ground water levels Sediment chemistry
Distribution of substrates
Pore water profiles
Chemical composition of substrates
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Simulation Simulation accuracyaccuracy of transfer functions of transfer functions
o-PO4-P ganzjährig
0
0,04
0,08
0,12
0 0,02 0,04 0,06 0,08 0,1 0,12 0,14
o-PO4-P gemessen (mg/l)
o-P
O4-P
ber
ech
net
(mg
/l)
K (Transferfunktion) 1:1 +25% -25%
NO3-N Sommerhalbjahr
0
1
2
3
4
0 1 2 3 4
NO3-N gemessen (mg/l)
NO
3-N
be
rec
hn
et
(mg
/l)
K (Transferfunktion) 1:1 +25% -25%
NO3-N Winterhalbjahr
0
1
2
3
4
0 1 2 3 4
NO3-N gemessen (mg/l)
NO
3-N
ber
ech
net
(mg
/l)
K (Transferfunktion) 1:1 +25% -25%
Chlorid ganzjährig
0
20
40
60
0 10 20 30 40 50 60
Chlorid gemessen (mg/l)
Ch
lori
d b
erec
hn
et
(mg
/l)
K (Transferfunktion) +25% 1:1 -25%
Sulfat-Sommerhalbjahr
0
100
200
300
400
500
600
0 100 200 300 400 500
Sulfat gemessen
Sul
fat b
erec
hnet
Sulfat-Winterhalbjahr
0
100
200
300
400
0 100 200 300 400
Sulfat gemessen
Su
lfa
t b
ere
ch
ne
t
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Sink and source function for sulphateSink and source function for sulphate
Hydraulic calculations for different discharge scenarios:
Summer- half year (SH) NW, MW, MHW, Winter- half year (WH) MW, HW
Area loads: simulated by „ArcGRM Spreewald“ in dependence on time (month) and input discharge
Algorithm for sulphate:
4600000 4620000 4640000 4660000 4680000
5730000
5740000
5750000
5760000
5770000
Sulfat
1000.00
775.00
550.00
325.00
100.00
4SOW4SO4SO CTk
x
Cu
CSpree = 1000 mg/l
CLeibsch = 381 mg/l
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010203040506070
SH_NW SH_MW SH_MHW WH_MW WH_HW
ZuflußszenarienS
ulf
atf
rac
ht
in k
g/s
0
200
400
600
800
1000
Su
lfa
tko
nze
ntr
ati
on
in
mg
/l
Input Output C out Spree C in Spree
SH_NW SH_MW SH_MHW WH_MW WH_HW
Portion on sulphate load reduction by running water system (sink)
% of input
21 18 12 21 10
Load reduction by water consumption and flooding (infiltration, sink)
% of input
15 2 2 0 0
Load addition by ground water (exfiltration, source)
% of output
0 0,1 3 4,5 0
Sulphate reduction
by the
Spreewald wetland region
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• Water quality modelling of the Spreewald wetland region at catchment scale needs model reductions
• Reduced model has to consider the main quality processes
• Special effect of wetlands is the load exchange with adjacent areas (in both directions)
• Governmental monitoring systems are not sufficient for data supply
SummarySummary
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Confluence of Große Fließ and Mittelkanal
Thank you