Results - Response of Flood Events to Land Use and Climate Change - page 188

Fig. 6.62 Priority of SOBEK in floodplain simulation

(a)

(b)

Fig. 6.63 Priority of HEC-RAS in channel simulation; a HEC-RAS; b SOBEK

policy making and for decisions supporting and planning hydraulic structures. Also,
the findings of this section could be more interesting for river hydraulic engineers
and researchers.

6.11 Flood Frequency Analysis

6.11.1 Return Period

Flood hazard analysis requires probability or return period statements assigned to a
scenario set. Therefore, in this research, synthetic event-based hydrographs based
on the extreme value were developed. Table 6.17 shows the results of the Gumbel
method to calculate different return periods at both upper and lower levels with
90 % confidence.