Traitement et analyse de séries chronologiques continues de ...

Annexes
a
b
c
1500
TSS (kg)
COD (kg)
d
Event loads (kg)
1000
500
0
1 2 3 4 5 6 7 8 9 1011 12 1314 1516 17 1819 2021 22 2324 25 2627 2829 30 3132 33
Event number
Figure 2. Example of results for the Chassieu catchment: (a) validation graphical user interface for water level
and turbidity time series from 1 - 20 January 2008, (b) Turbidity-TSS and (c) Turbidity-COD correlation
functions, (d) TSS (in black) and COD (in white) event loads in 2005 with 95 % confidence intervals.
In 2005, 33 storm events have been monitored in Chassieu. For each event, TSS and COD event loads
have been calculated, with their 95 % confidence intervals. The results are shown in Figure 2d: black
and white thick bars represent respectively the TSS and COD loads for the 33 events. Each thick bar is
completed with a vertical thin bar segment representing the 95 % confidence interval of the event load.
The variability of the event loads is very significant, with values ranging typically from a few to 400-
500 kg of TSS or COD per event. The event number 25 shows extremely high loads compared to all
the other ones. A further analysis of these 33 events loads (results not shown here) has indicated that
there was no correlation between events loads and basic event characteristics like rainfall duration,
intensity, antecedent dry weather period or rainfall return period.