Κατεύθυνση Πρόληψη και Διαχείριση των Φυσικών Καταστροφών
Library of the School of Science

2012-11-28

2012

Μπαρσάκη Βασιλική

Φουντούλης Ιωάννης Αναπλ. Καθηγ., Λέκκας Ευθύμιος Καθηγ., Ευελπίδου Νίκη Επικ. Καθηγ.

Εκτίμηση πλημμυρικού κινδύνου με τη χρήση GIS στη λεκάνη του Λήλαντα ποταμού (Κεντρική Εύβοια)

Greek

In September 2009, extensive floods followed intense storm in Lelas basin.
Severe damages occurred at several areas along the main riverbed from Mistros
village to Vasiliko beach, at the estuary of the river. Meteorological data
were statistically processed, showing recurrence time of 100 years for the
amount of the event precipitation. Curve Number (SCS-CN) method was applied to
calculate maximum direct runoff (qp) at the estuary to about 1000 m3/sec. The
composite hydrograph of the flood event was constructed using land use/cover
data before and after wildfires in the basin. Delta shoreline changes from 1950
till today were also studied and mapped. Stream Power was calculated along two
tributaries and the main riverbed of Lelas. Multifactor morphometric analysis
was applied to map flood hazard. Results show that the flood was due to extreme
precipitation on a terrain already saturated by rain during the previous days.
Flooding occurred in areas predicted by the supplementary use of the mapping
methods, but damages were greatly enhanced by human intervention in the
riverbed and false application of land use zoning. Hydrological impact of
previous wildfires (23% of the basin during the previous 25 years) amounted to
a 10% increase of peak runoff.

Natural disasters

Geomorphology
Databases and Information Systems
Cartogrpaphy

Lelas, Flood hazard, Central Euboia

No

0

Yes

109

160

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https://pergamos.lib.uoa.gr/uoa/dl/object/1317124