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Joint project Spree
Matter transformation in the Spreewald wetland region
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
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
Conceptual modelConceptual model
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
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
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
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
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
• 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
Confluence of Große Fließ and Mittelkanal
Thank you