0
2
4
6
8
10
0
50 100 150 200 250 300 350
oxygen, mgO
2 l -1
km
1969-1971
150 m3 s -1
280 m3 s-1
0
4
8
12
0
50 100 150 200 250 300 350
Ammonium, mgN-NH
4 l -1
km
1969-1971
150 m3 s -1
280 m3 s-1
0
2
4
6
8
10
0
50 100 150 200 250 300 350
oxygen, mgO
2 l -1
km
1973-1978
0
4
8
12
0
50 100 150 200 250 300 350
Ammonium, mgN-NH
4 l -1
km
1973-1978
0
2
4
6
8
10
0
50 100 150 200 250 300 350
oxygen, mgO
2 l -1
km
1989-1992
0
4
8
12
0
50 100 150 200 250 300 350
Ammonium, mgN-NH
4 l -1
km
1989-1992
0
2
4
6
8
10
0
50 100 150 200 250 300 350
oxygen, mgO
2 l -1
km
1995-1997
0
4
8
12
0
50 100 150 200 250 300 350
Ammonium, mg N-NH
4 l -1
km
1995-1997
0
2
4
6
8
10
0
50 100 150 200 250 300 350
oxygen, mgO
2 l -1
km
2010-2014
0
4
8
12
0
50 100 150 200 250 300 350
Ammonium, mg N-NH
4 l -1
km
2010-2014
Fig. 4 Longitudinal profiles of oxygen (left) and ammonium (right) concentrations along the lower
Seine River (0 km at Paris). Black dots are observations; coloured lines are simulations by the
Riverstrahler model for two levels of water flow. Time periods are shown from top to bottom (from
the oldest to the most recent)
198
J. Garnier et al.