Biophysical Characterisation of Fluvial Corridors at Reach to Network Scales - Fluvial Remote Sensing for Science and Management - page 248

Villette
convexity

Bridge
SNCF

Weir of
Pont d'Ain

1963

Bridge
of Priay

Bridge of
Chazey

Bridge
of Gévrieux

Weir of Neuville
sur Ain

80

Oussiat
convexity

60

Bellegarde Martinaz

40

20

1980

80

60

40

20

Bridge of highway
A42

80

2000

60

40

20

5 10 15 20 25 30 35

Upstream Downstream

Distance from Allement dam (km)

(a)

Bridge of St
Maurice de
Gourdan

40

Bridge of Priay Martinaz

Weir of Oussiat

35

Bridge of
Chazey

Bridge of
Port Neuf

Weir of
Pont d'Ain

Bridge of
Gévrieux

30

Bridge
of SNCF

25

20

15

10

10 15 20 25 30 35 40 45 50

Upstream Downstream

Distance from Allement dam (km)

(b)

Figure 11.7 Analysis of the Ain river channel changes related to the Allement dam construction (1960) : aerial photos are combined
with field data (grain size data provided from ground imagery). a) Longitudinal distribution of gravel bars in 1963, 1980 and 2000
showing the progressive disappearance of the gravel surface from 10 m long segments, b) Longitudinal distribution of gravel bar grain
size showing the front of progressive erosion km 27 (dark line is a moving average, grey points are sampled bars).